- 15 Mar, 2017 4 commits
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Stephane Eranian authored
This patch significantly improves the execution time of perf_event__synthesize_mmap_events() when running perf record on systems where processes have lots of threads. It just happens that cat /proc/pid/maps support uses a O(N^2) algorithm to generate each map line in the maps file. If you have 1000 threads, then you have necessarily 1000 stacks. For each vma, you need to check if it corresponds to a thread's stack. With a large number of threads, this can take a very long time. I have seen latencies >> 10mn. As of today, perf does not use the fact that a mapping is a stack, therefore we can work around the issue by using /proc/pid/tasks/pid/maps. This entry does not try to map a vma to stack and is thus much faster with no loss of functonality. The proc-map-timeout logic is kept in case users still want some upper limit. In V2, we fix the file path from /proc/pid/tasks/pid/maps to actual /proc/pid/task/pid/maps, tasks -> task. Thanks Arnaldo for catching this. Committer note: This problem seems to have been elliminated in the kernel since commit : b18cb64e ("fs/proc: Stop trying to report thread stacks"). Signed-off-by:
Stephane Eranian <eranian@google.com> Acked-by:
Jiri Olsa <jolsa@redhat.com> Cc: Andy Lutomirski <luto@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20170315135059.GC2177@redhat.com Link: http://lkml.kernel.org/r/1489598233-25586-1-git-send-email-eranian@google.comSigned-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Naveen N. Rao authored
perf specifies an offset from _text and since this offset is fed directly into the arch-specific helper, kprobes tracer rejects installation of kretprobes through perf. Fix this by looking up the actual offset from a function for the specified sym+offset. Refactor and reuse existing routines to limit code duplication -- we repurpose kprobe_addr() for determining final kprobe address and we split out the function entry offset determination into a separate generic helper. Before patch: naveen@ubuntu:~/linux/tools/perf$ sudo ./perf probe -v do_open%return probe-definition(0): do_open%return symbol:do_open file:(null) line:0 offset:0 return:1 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /boot/vmlinux for symbols Open Debuginfo file: /boot/vmlinux Try to find probe point from debuginfo. Matched function: do_open [2d0c7ff] Probe point found: do_open+0 Matched function: do_open [35d76dc] found inline addr: 0xc0000000004ba9c4 Failed to find "do_open%return", because do_open is an inlined function and has no return point. An error occurred in debuginfo analysis (-22). Trying to use symbols. Opening /sys/kernel/debug/tracing//README write=0 Opening /sys/kernel/debug/tracing//kprobe_events write=1 Writing event: r:probe/do_open _text+4469776 Failed to write event: Invalid argument Error: Failed to add events. Reason: Invalid argument (Code: -22) naveen@ubuntu:~/linux/tools/perf$ dmesg | tail <snip> [ 33.568656] Given offset is not valid for return probe. After patch: naveen@ubuntu:~/linux/tools/perf$ sudo ./perf probe -v do_open%return probe-definition(0): do_open%return symbol:do_open file:(null) line:0 offset:0 return:1 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /boot/vmlinux for symbols Open Debuginfo file: /boot/vmlinux Try to find probe point from debuginfo. Matched function: do_open [2d0c7d6] Probe point found: do_open+0 Matched function: do_open [35d76b3] found inline addr: 0xc0000000004ba9e4 Failed to find "do_open%return", because do_open is an inlined function and has no return point. An error occurred in debuginfo analysis (-22). Trying to use symbols. Opening /sys/kernel/debug/tracing//README write=0 Opening /sys/kernel/debug/tracing//kprobe_events write=1 Writing event: r:probe/do_open _text+4469808 Writing event: r:probe/do_open_1 _text+4956344 Added new events: probe:do_open (on do_open%return) probe:do_open_1 (on do_open%return) You can now use it in all perf tools, such as: perf record -e probe:do_open_1 -aR sleep 1 naveen@ubuntu:~/linux/tools/perf$ sudo cat /sys/kernel/debug/kprobes/list c000000000041370 k kretprobe_trampoline+0x0 [OPTIMIZED] c0000000004ba0b8 r do_open+0x8 [DISABLED] c000000000443430 r do_open+0x0 [DISABLED] Signed-off-by:Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Acked-by:
Masami Hiramatsu <mhiramat@kernel.org> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: linuxppc-dev@lists.ozlabs.org Link: http://lkml.kernel.org/r/d8cd1ef420ec22e3643ac332fdabcffc77319a42.1488961018.git.naveen.n.rao@linux.vnet.ibm.comSigned-off-by:
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Ravi Bangoria authored
Factor out the SDT event name checking routine as is_sdt_event(). Signed-off-by:
Ravi Bangoria <ravi.bangoria@linux.vnet.ibm.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> Cc: Andi Kleen <ak@linux.intel.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: He Kuang <hekuang@huawei.com> Cc: Hemant Kumar <hemant@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Masami Hiramatsu <mhiramat@kernel.org> Cc: Mathieu Poirier <mathieu.poirier@linaro.org> Cc: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com> Cc: Taeung Song <treeze.taeung@gmail.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/r/20170314150658.7065-2-ravi.bangoria@linux.vnet.ibm.comSigned-off-by:
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Ingo Molnar authored
Merge tag 'perf-core-for-mingo-4.12-20170314' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: New features: - Add PERF_RECORD_NAMESPACES so that the kernel can record information required to associate samples to namespaces, helping in container problem characterization. Now the 'perf record has a --namespace' option to ask for such info, and when present, it can be used, initially, via a new sort order, 'cgroup_id', allowing histogram entry bucketization by a (device, inode) based cgroup identifier (Hari Bathini) - Add --next option to 'perf sched timehist', showing what is the next thread to run (Brendan Gregg) Fixes: - Fix segfault with basic block 'cycles' sort dimension (Changbin Du) - Add c2c to command-list.txt, making it appear in the 'perf help' output (Changbin Du) - Fix zeroing of 'abs_path' variable in the perf hists browser switch file code (Changbin Du) - Hide tips messages when -q/--quiet is given to 'perf report' (Namhyung Kim) Infrastructure changes: - Use ref_reloc_sym + offset to setup kretprobes (Naveen Rao) - Ignore generated files pmu-events/{jevents,pmu-events.c} for git (Changbin Du) Documentation changes: - Document +field style argument support for --field option (Changbin Du) - Clarify 'perf c2c --stats' help message (Namhyung Kim) Signed-off-by:
Ingo Molnar <mingo@kernel.org>
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- 14 Mar, 2017 10 commits
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Naveen N. Rao authored
commit fc62d020 ("kprobes: Introduce weak variant of kprobe_exceptions_notify()") used the __kprobes annotation to exclude kprobe_exceptions_notify from being probed. Since NOKPROBE_SYMBOL() is a better way to do this enabling the symbol to be discovered as being blacklisted, change over to using NOKPROBE_SYMBOL(). Signed-off-by:
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Naveen N. Rao authored
Update kprobe tracer documentation to also mention that NOKPROBE_SYMBOL() and nokprobe_inline add symbols to the kprobes blacklist. Signed-off-by:
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Naveen N. Rao authored
perf now uses an offset from _text/_stext for kretprobes if the kernel supports it, rather than the actual function name. As such, let's choose the LEP for powerpc ABIv2 so as to ensure the probe gets hit. Do it only if the kernel supports specifying offsets with kretprobes. Signed-off-by:
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Naveen N. Rao authored
We indicate support for accepting sym+offset with kretprobes through a line in ftrace README. Parse the same to identify support and choose the appropriate format for kprobe_events. As an example, without this perf patch, but with the ftrace changes: naveen@ubuntu:~/linux/tools/perf$ sudo cat /sys/kernel/debug/tracing/README | grep kretprobe place (kretprobe): [<module>:]<symbol>[+<offset>]|<memaddr> naveen@ubuntu:~/linux/tools/perf$ naveen@ubuntu:~/linux/tools/perf$ sudo ./perf probe -v do_open%return probe-definition(0): do_open%return symbol:do_open file:(null) line:0 offset:0 return:1 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /boot/vmlinux for symbols Open Debuginfo file: /boot/vmlinux Try to find probe point from debuginfo. Matched function: do_open [2d0c7d8] Probe point found: do_open+0 Matched function: do_open [35d76b5] found inline addr: 0xc0000000004ba984 Failed to find "do_open%return", because do_open is an inlined function and has no return point. An error occurred in debuginfo analysis (-22). Trying to use symbols. Opening /sys/kernel/debug/tracing//kprobe_events write=1 Writing event: r:probe/do_open do_open+0 Writing event: r:probe/do_open_1 do_open+0 Added new events: probe:do_open (on do_open%return) probe:do_open_1 (on do_open%return) You can now use it in all perf tools, such as: perf record -e probe:do_open_1 -aR sleep 1 naveen@ubuntu:~/linux/tools/perf$ sudo cat /sys/kernel/debug/kprobes/list c000000000041370 k kretprobe_trampoline+0x0 [OPTIMIZED] c0000000004433d0 r do_open+0x0 [DISABLED] c0000000004433d0 r do_open+0x0 [DISABLED] And after this patch (and the subsequent powerpc patch): naveen@ubuntu:~/linux/tools/perf$ sudo ./perf probe -v do_open%return probe-definition(0): do_open%return symbol:do_open file:(null) line:0 offset:0 return:1 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /boot/vmlinux for symbols Open Debuginfo file: /boot/vmlinux Try to find probe point from debuginfo. Matched function: do_open [2d0c7d8] Probe point found: do_open+0 Matched function: do_open [35d76b5] found inline addr: 0xc0000000004ba984 Failed to find "do_open%return", because do_open is an inlined function and has no return point. An error occurred in debuginfo analysis (-22). Trying to use symbols. Opening /sys/kernel/debug/tracing//README write=0 Opening /sys/kernel/debug/tracing//kprobe_events write=1 Writing event: r:probe/do_open _text+4469712 Writing event: r:probe/do_open_1 _text+4956248 Added new events: probe:do_open (on do_open%return) probe:do_open_1 (on do_open%return) You can now use it in all perf tools, such as: perf record -e probe:do_open_1 -aR sleep 1 naveen@ubuntu:~/linux/tools/perf$ sudo cat /sys/kernel/debug/kprobes/list c000000000041370 k kretprobe_trampoline+0x0 [OPTIMIZED] c0000000004433d0 r do_open+0x0 [DISABLED] c0000000004ba058 r do_open+0x8 [DISABLED] Signed-off-by: -
Naveen N. Rao authored
Simplify and separate out the ftrace README scanning logic into a separate helper. This is used subsequently to scan for all patterns of interest and to cache the result. Since we are only interested in availability of probe argument type x, we will only scan for that. Signed-off-by:
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Brendan Gregg authored
The --next option shows the next task for each context switch, providing more context for the sequence of scheduler events. $ perf sched timehist --next | head Samples do not have callchains. time cpu task name waittime schdelay run time [tid/pid] (msec) (msec) (msec) ---------- --- ---------- --------- ------ ----- 374.793792 [0] <idle> 0.000 0.000 0.000 next: rngd[1524] 374.793801 [0] rngd[1524] 0.000 0.000 0.009 next: swapper/0[0] 374.794048 [7] <idle> 0.000 0.000 0.000 next: yes[30884] 374.794066 [7] yes[30884] 0.000 0.000 0.018 next: swapper/7[0] 374.794126 [2] <idle> 0.000 0.000 0.000 next: rngd[1524] 374.794140 [2] rngd[1524] 0.325 0.006 0.013 next: swapper/2[0] 374.794281 [3] <idle> 0.000 0.000 0.000 next: perf[31070] Signed-off-by:Brendan Gregg <bgregg@netflix.com> Tested-by:
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Hari Bathini authored
This patch introduces a cgroup identifier entry field in perf report to identify or distinguish data of different cgroups. It uses the device number and inode number of cgroup namespace, included in perf data with the new PERF_RECORD_NAMESPACES event, as cgroup identifier. With the assumption that each container is created with it's own cgroup namespace, this allows assessment/analysis of multiple containers at once. A simple test for this would be to clone a few processes passing SIGCHILD & CLONE_NEWCROUP flags to each of them, execute shell and run different workloads on each of those contexts, while running perf record command with --namespaces option. Shown below is the output of perf report, sorted with cgroup identifier, on perf.data generated with the above test scenario, clearly indicating one context's considerable use of kernel memory in comparison with others: $ perf report -s cgroup_id,sample --stdio # # Total Lost Samples: 0 # # Samples: 5K of event 'kmem:kmalloc' # Event count (approx.): 5965 # # Overhead cgroup id (dev/inode) Samples # ........ ..................... ............ # 81.27% 3/0xeffffffb 4848 16.24% 3/0xf00000d0 969 1.16% 3/0xf00000ce 69 0.82% 3/0xf00000cf 49 0.50% 0/0x0 30 While this is a start, there is further scope of improving this. For example, instead of cgroup namespace's device and inode numbers, dev and inode numbers of some or all namespaces may be used to distinguish which processes are running in a given container context. Also, scripts to map device and inode info to containers sounds plausible for better tracing of containers. Signed-off-by:
Hari Bathini <hbathini@linux.vnet.ibm.com> Tested-by:
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Hari Bathini authored
Introduce a new option to display events of type PERF_RECORD_NAMESPACES and update perf-script documentation accordingly. Shown below is output (trimmed) of perf script command with the newly introduced option, on perf.data generated with perf record command using --namespaces option. $ perf script --show-namespace-events swapper 0 [000] 0.000000: PERF_RECORD_NAMESPACES 1/1 - nr_namespaces: 7 [0/net: 3/0xf000001c, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc, 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb] swapper 0 [000] 0.000000: PERF_RECORD_NAMESPACES 2/2 - nr_namespaces: 7 [0/net: 3/0xf000001c, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc, 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb] Commiter notes: Testing it: Investigating that double PERF_RECORD_NAMESPACES for the 19155 pid/tid... Its more than that, there are two PERF_RECORD_COMM as well, and with zeroed timestamps, so probably a synthesizing artifact... # perf script --show-task --show-namespace <SNIP> perf 0 [000] 0.000000: PERF_RECORD_COMM: perf:19154/19154 perf 0 [000] 0.000000: PERF_RECORD_FORK(19155:19155):(19154:19154) perf 0 [000] 0.000000: PERF_RECORD_NAMESPACES 19155/19155 - nr_namespaces: 7 [0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc, 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb] perf 0 [000] 0.000000: PERF_RECORD_COMM: perf:19155/19155 perf 0 [000] 0.000000: PERF_RECORD_COMM: perf:19155/19155 perf 0 [000] 0.000000: PERF_RECORD_NAMESPACES 19155/19155 - nr_namespaces: 7 [0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc, 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb] swapper 0 [000] 3110.881834: 1 cycles: ffffffffa7060bf6 native_write_msr (/lib/modules/4.11.0-rc1+/build/vmlinux) <SNIP> Signed-off-by:Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sargun Dhillon <sargun@sargun.me> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/148891932627.25309.1941587059154176221.stgit@hbathini.in.ibm.comSigned-off-by:
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Hari Bathini authored
Synthesize PERF_RECORD_NAMESPACES events for processes that were running prior to invocation of perf record. The data for this is taken from /proc/$PID/ns. These changes make way for analyzing events with regard to namespaces. Committer notes: Check if 'tool' is NULL in perf_event__synthesize_namespaces(), as in the test__mmap_thread_lookup case, i.e. 'perf test Lookup mmap thread". Testing it: # ps axH > /tmp/allthreads # perf record -a --namespaces usleep 1 [ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 1.169 MB perf.data (8 samples) ] # perf report -D | grep PERF_RECORD_NAMESPACES | wc -l 602 # wc -l /tmp/allthreads 601 /tmp/allthreads # tail /tmp/allthreads 16951 pts/4 T 0:00 git rebase -i a033bf1bfacdaa25642e6bcc857a7d0f67cc3c92^ 16952 pts/4 T 0:00 /bin/sh /usr/libexec/git-core/git-rebase -i a033bf1bfacdaa25642e6bcc857a7d0f67cc3c92^ 17176 pts/4 T 0:00 git commit --amend --no-post-rewrite 17204 pts/4 T 0:00 vim /home/acme/git/linux/.git/COMMIT_EDITMSG 18939 ? S 0:00 [kworker/2:1] 18947 ? S 0:00 [kworker/3:0] 18974 ? S 0:00 [kworker/1:0] 19047 ? S 0:00 [kworker/0:1] 19152 pts/6 S+ 0:00 weechat 19153 pts/7 R+ 0:00 ps axH # perf report -D | grep PERF_RECORD_NAMESPACES | tail 0 0 0x125068 [0xa0]: PERF_RECORD_NAMESPACES 17176/17176 - nr_namespaces: 7 0 0 0x1255b8 [0xa0]: PERF_RECORD_NAMESPACES 17204/17204 - nr_namespaces: 7 0 0 0x125df0 [0xa0]: PERF_RECORD_NAMESPACES 18939/18939 - nr_namespaces: 7 0 0 0x125f00 [0xa0]: PERF_RECORD_NAMESPACES 18947/18947 - nr_namespaces: 7 0 0 0x126010 [0xa0]: PERF_RECORD_NAMESPACES 18974/18974 - nr_namespaces: 7 0 0 0x126120 [0xa0]: PERF_RECORD_NAMESPACES 19047/19047 - nr_namespaces: 7 0 0 0x126230 [0xa0]: PERF_RECORD_NAMESPACES 19152/19152 - nr_namespaces: 7 0 0 0x129330 [0xa0]: PERF_RECORD_NAMESPACES 19154/19154 - nr_namespaces: 7 0 0 0x12a1f8 [0xa0]: PERF_RECORD_NAMESPACES 19155/19155 - nr_namespaces: 7 0 0 0x12b0b8 [0xa0]: PERF_RECORD_NAMESPACES 19155/19155 - nr_namespaces: 7 # Humm, investigate why we got two record for the 19155 pid/tid... Signed-off-by:
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Hari Bathini authored
Introduce a new option to record PERF_RECORD_NAMESPACES events emitted by the kernel when fork, clone, setns or unshare are invoked. And update perf-record documentation with the new option to record namespace events. Committer notes: Combined it with a later patch to allow printing it via 'perf report -D' and be able to test the feature introduced in this patch. Had to move here also perf_ns__name(), that was introduced in another later patch. Also used PRIu64 and PRIx64 to fix the build in some enfironments wrt: util/event.c:1129:39: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'long long unsigned int' [-Werror=format=] ret += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx ^ Testing it: # perf record --namespaces -a ^C[ perf record: Woken up 1 times to write data ] [ perf record: Captured and wrote 1.083 MB perf.data (423 samples) ] # # perf report -D <SNIP> 3 2028902078892 0x115140 [0xa0]: PERF_RECORD_NAMESPACES 14783/14783 - nr_namespaces: 7 [0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc, 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb] 0x1151e0 [0x30]: event: 9 . . ... raw event: size 48 bytes . 0000: 09 00 00 00 02 00 30 00 c4 71 82 68 0c 7f 00 00 ......0..q.h.... . 0010: a9 39 00 00 a9 39 00 00 94 28 fe 63 d8 01 00 00 .9...9...(.c.... . 0020: 03 00 00 00 00 00 00 00 ce c4 02 00 00 00 00 00 ................ <SNIP> NAMESPACES events: 1 <SNIP> # Signed-off-by:
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- 13 Mar, 2017 6 commits
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Hari Bathini authored
With the advert of container technologies like docker, that depend on namespaces for isolation, there is a need for tracing support for namespaces. This patch introduces new PERF_RECORD_NAMESPACES event for recording namespaces related info. By recording info for every namespace, it is left to userspace to take a call on the definition of a container and trace containers by updating perf tool accordingly. Each namespace has a combination of device and inode numbers. Though every namespace has the same device number currently, that may change in future to avoid the need for a namespace of namespaces. Considering such possibility, record both device and inode numbers separately for each namespace. Signed-off-by:
Peter Zijlstra <peterz@infradead.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Starovoitov <ast@fb.com> Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com> Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com> Cc: Brendan Gregg <brendan.d.gregg@gmail.com> Cc: Daniel Borkmann <daniel@iogearbox.net> Cc: Eric Biederman <ebiederm@xmission.com> Cc: Sargun Dhillon <sargun@sargun.me> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/148891929686.25309.2827618988917007768.stgit@hbathini.in.ibm.comSigned-off-by:
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Changbin Du authored
Should clear buf 'abs_path', not 'options'. Signed-off-by:
Changbin Du <changbin.du@intel.com> Cc: Feng Tang <feng.tang@intel.com> Cc: Peter Zijlstra <peterz@infradead.org> Fixes: 341487ab ("perf hists browser: Add option for runtime switching perf data file") Link: http://lkml.kernel.org/r/20170313114652.9207-1-changbin.du@intel.comSigned-off-by:
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Changbin Du authored
Commit 2f3f9bcf ("perf tools: Add +field argument support for --field option") by Jiri Olsa <jolsa@kernel.org> introduced +field style argument support for --field option. This is useful but not updated documentation. This add a little description there. Signed-off-by:
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Changbin Du authored
Skip the sample which doesn't have branch_info to avoid segmentation fault: The fault can be reproduced by: perf record -a perf report -F cycles Signed-off-by:
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Changbin Du authored
Ignore two files: pmu-events/{jevents,pmu-events.c} which are generated during the build. Committer notes: Testing it: $ make -C tools/perf/ $ git status On branch perf/core Untracked files: (use "git add <file>..." to include in what will be committed) tools/perf/pmu-events/jevents tools/perf/pmu-events/pmu-events.c nothing added to commit but untracked files present (use "git add" to track) $ After the patch: $ git status On branch perf/core nothing to commit, working tree clean $ Signed-off-by: -
Changbin Du authored
Add the c2c command to command-list.txt so perf help can list this command. Committer notes: Before: # perf help | grep c2c # After: # perf help | grep c2c c2c Shared Data C2C/HITM Analyzer. # Signed-off-by:
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- 07 Mar, 2017 4 commits
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Namhyung Kim authored
Currently 'perf c2c report' determines display mode using the --stdio option, but it could be a problem if stdout is not a tty since setup_browser falls back to stdio in this case. But perf c2c didn't know this and tried to use TUI browser anyway. It should check "use_browser" variable instead. For example, the following command showed nothing and broke terminal setting. Now it's fixed.. $ perf c2c report | head ================================================= Trace Event Information ================================================= Total records : 136 Locked Load/Store Operations : 6 Load Operations : 62 Loads - uncacheable : 0 Loads - IO : 1 Loads - Miss : 7 Loads - no mapping : 2 Committer notes: When trying it without a proper perf.data file it results in a stuck terminal, just as Namhyung reported above: [acme@jouet ~]$ perf c2c report | head WARNING: no sample cpu value[acme@jouet ~]$ One has to kill it from some other xterm. Confirm that this patch fixes it: After: $ perf c2c report | head WARNING: no sample cpu value================================================= Trace Event Information ================================================= Total records : 14 Locked Load/Store Operations : 0 Load Operations : 0 Loads - uncacheable : 0 Loads - IO : 0 Loads - Miss : 0 Loads - no mapping : 0 $ Signed-off-by:Namhyung Kim <namhyung@kernel.org> Tested-by:
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Namhyung Kim authored
As it is not strictly asking for only stdio output, but will imply using it. Signed-off-by:
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Namhyung Kim authored
The tip message at the end was printed regardless of the -q option. Originally, the message suggested only '-s comm,dso' option for higher level view when no sort option and parent option were given. Now it shows random help message regardless of the options so the condition can be simplified to honor the -q option. Committer notes: Before: $ perf report --stdio -q 42.77% ls ls [.] _init 13.21% ls ld-2.24.so [.] match_symbol 12.55% ls libc-2.24.so [.] __strcoll_l 11.94% ls libc-2.24.so [.] _init # # (Tip: Show current config key-value pairs: perf config --list) # $ After: $ perf report --stdio -q 42.77% ls ls [.] _init 13.21% ls ld-2.24.so [.] match_symbol 12.55% ls libc-2.24.so [.] __strcoll_l 11.94% ls libc-2.24.so [.] _init $ We still have those two extra lines tho (that git commit insists in turning into one, or git commit --amend doesn't make me add), food for another patch... Reported-and-Tested-by: -
Ingo Molnar authored
Merge tag 'perf-core-for-mingo-4.11-20170306' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo: New features: - Allow sorting by symbol_size in 'perf report' and 'perf top' (Charles Baylis) E.g.: # perf report -s symbol_size,symbol Samples: 9K of event 'cycles:k', Event count (approx.): 2870461623 Overhead Symbol size Symbol 14.55% 326 [k] flush_tlb_mm_range 7.20% 1045 [k] filemap_map_pages 5.82% 124 [k] vma_interval_tree_insert 5.18% 2430 [k] unmap_page_range 2.57% 571 [k] vma_interval_tree_remove 1.94% 494 [k] page_add_file_rmap 1.82% 740 [k] page_remove_rmap 1.66% 1017 [k] release_pages 1.57% 1636 [k] update_blocked_averages 1.57% 76 [k] unlock_page - Add support for -p/--pid, -a/--all-cpus and -C/--cpu in 'perf ftrace' (Namhyung Kim) Change in behaviour: - Make system wide (-a) the default option if no target was specified and one of following conditions is met: - No workload specified (current behaviour) - A workload is specified but all requested events are system wide ones, like uncore ones. (Jiri Olsa) Fixes: - Add missing initialization to the instruction decoder used in the intel PT/BTS code, which was causing lots of failures in 'perf test', looking for a value when there was none (Adrian Hunter) Infrastructure changes: - Add arch code needed to adopt the kernel's refcount_t to aid in catching bugs when using atomic_t as a reference counter, basically cmpxchg related functions (Arnaldo Carvalho de Melo) - Convert the code using atomic_t as reference counts to refcount_t (Elena Rashetova) - Add feature test for sched_getcpu() to more easily check for its presence in the many libc implementations and accross different versions of such C libraries (Arnaldo Carvalho de Melo) - Issue a HW watchdog disable hint in 'perf stat' for when some of the requested events can't get counted because a PMU counter is taken by that watchdog (Borislav Petkov). - Add mapping for Intel's KnightsMill PMU events (Karol Wachowski) Documentation changes: - Clarify the term 'convergence' in: perf bench numa numa-mem -h --show_convergence (Jiri Olsa) Kernel code changes: - Ensure probe location is at function entry in kretprobes (Naveen N. Rao) - Allow return probes with offsets and absolute addresses (Naveen N. Rao) Signed-off-by:
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- 06 Mar, 2017 1 commit
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Jiri Olsa authored
Adding more commentary for -c/--show_convergence option, to explain how the convergence is defined. Before: -c, --show_convergence show convergence details Now: -c, --show_convergence convergence is reached when each process \ (all its threads) is running on a single NUMA node. Suggested--by:Jiri Hladky <jhladky@redhat.com> Signed-off-by:
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- 05 Mar, 2017 2 commits
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Linus Torvalds authored
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git://git.kernel.org/pub/scm/linux/kernel/git/davem/netLinus Torvalds authored
Pull networking fixes from David Miller: 1) Fix double-free in batman-adv, from Sven Eckelmann. 2) Fix packet stats for fast-RX path, from Joannes Berg. 3) Netfilter's ip_route_me_harder() doesn't handle request sockets properly, fix from Florian Westphal. 4) Fix sendmsg deadlock in rxrpc, from David Howells. 5) Add missing RCU locking to transport hashtable scan, from Xin Long. 6) Fix potential packet loss in mlxsw driver, from Ido Schimmel. 7) Fix race in NAPI handling between poll handlers and busy polling, from Eric Dumazet. 8) TX path in vxlan and geneve need proper RCU locking, from Jakub Kicinski. 9) SYN processing in DCCP and TCP need to disable BH, from Eric Dumazet. 10) Properly handle net_enable_timestamp() being invoked from IRQ context, also from Eric Dumazet. 11) Fix crash on device-tree systems in xgene driver, from Alban Bedel. 12) Do not call sk_free() on a locked socket, from Arnaldo Carvalho de Melo. 13) Fix use-after-free in netvsc driver, from Dexuan Cui. 14) Fix max MTU setting in bonding driver, from WANG Cong. 15) xen-netback hash table can be allocated from softirq context, so use GFP_ATOMIC. From Anoob Soman. 16) Fix MAC address change bug in bgmac driver, from Hari Vyas. 17) strparser needs to destroy strp_wq on module exit, from WANG Cong. * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (69 commits) strparser: destroy workqueue on module exit sfc: fix IPID endianness in TSOv2 sfc: avoid max() in array size rds: remove unnecessary returned value check rxrpc: Fix potential NULL-pointer exception nfp: correct DMA direction in XDP DMA sync nfp: don't tell FW about the reserved buffer space net: ethernet: bgmac: mac address change bug net: ethernet: bgmac: init sequence bug xen-netback: don't vfree() queues under spinlock xen-netback: keep a local pointer for vif in backend_disconnect() netfilter: nf_tables: don't call nfnetlink_set_err() if nfnetlink_send() fails netfilter: nft_set_rbtree: incorrect assumption on lower interval lookups netfilter: nf_conntrack_sip: fix wrong memory initialisation can: flexcan: fix typo in comment can: usb_8dev: Fix memory leak of priv->cmd_msg_buffer can: gs_usb: fix coding style can: gs_usb: Don't use stack memory for USB transfers ixgbe: Limit use of 2K buffers on architectures with 256B or larger cache lines ixgbe: update the rss key on h/w, when ethtool ask for it ...
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- 04 Mar, 2017 13 commits
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git://git.kernel.org/pub/scm/virt/kvm/kvmLinus Torvalds authored
Pull more KVM updates from Radim Krčmář: "Second batch of KVM changes for the 4.11 merge window: PPC: - correct assumption about ASDR on POWER9 - fix MMIO emulation on POWER9 x86: - add a simple test for ioperm - cleanup TSS (going through KVM tree as the whole undertaking was caused by VMX's use of TSS) - fix nVMX interrupt delivery - fix some performance counters in the guest ... and two cleanup patches" * tag 'kvm-4.11-2' of git://git.kernel.org/pub/scm/virt/kvm/kvm: KVM: nVMX: Fix pending events injection x86/kvm/vmx: remove unused variable in segment_base() selftests/x86: Add a basic selftest for ioperm x86/asm: Tidy up TSS limit code kvm: convert kvm.users_count from atomic_t to refcount_t KVM: x86: never specify a sample period for virtualized in_tx_cp counters KVM: PPC: Book3S HV: Don't use ASDR for real-mode HPT faults on POWER9 KVM: PPC: Book3S HV: Fix software walk of guest process page tables -
git://git.lwn.net/linuxLinus Torvalds authored
Pull documentation fixes from Jonathan Corbet: "A few fixes for the docs tree, including one for a 4.11 build regression" * tag 'docs-4.11-fixes' of git://git.lwn.net/linux: Documentation/sphinx: fix primary_domain configuration docs: Fix htmldocs build failure doc/ko_KR/memory-barriers: Update control-dependencies section pcieaer doc: update the link Documentation: Update path to sysrq.txt
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git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/stagingLinus Torvalds authored
Pull staging/IIO driver fixes from Greg KH: "Here are a few small staging and IIO driver fixes for issues that showed up after the big set if changes you merged last week. Nothing major, just small bugs resolved in some IIO drivers, a lustre allocation fix, and some RaspberryPi driver fixes for reported problems, as well as a MAINTAINERS entry update. All of these have been in linux-next for a week with no reported issues" * tag 'staging-4.11-rc1-part2' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: staging: fsl-mc: fix warning in DT ranges parser MAINTAINERS: Remove Noralf Trønnes as fbtft maintainer staging: vchiq_2835_arm: Make cache-line-size a required DT property staging: bcm2835/mmal-vchiq: unlock on error in buffer_from_host() staging/lustre/lnet: Fix allocation size for sv_cpt_data iio: adc: xilinx: Fix error handling iio: 104-quad-8: Fix off-by-one error when addressing flag register iio: adc: handle unknow of_device_id data
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git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6Linus Torvalds authored
Pull crypto fixes from Herbert Xu: - vmalloc stack regression in CCM - Build problem in CRC32 on ARM - Memory leak in cavium - Missing Kconfig dependencies in atmel and mediatek - XTS Regression on some platforms (s390 and ppc) - Memory overrun in CCM test vector * 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6: crypto: vmx - Use skcipher for xts fallback crypto: vmx - Use skcipher for cbc fallback crypto: testmgr - Pad aes_ccm_enc_tv_template vector crypto: arm/crc32 - add build time test for CRC instruction support crypto: arm/crc32 - fix build error with outdated binutils crypto: ccm - move cbcmac input off the stack crypto: xts - Propagate NEED_FALLBACK bit crypto: api - Add crypto_requires_off helper crypto: atmel - CRYPTO_DEV_MEDIATEK should depend on HAS_DMA crypto: atmel - CRYPTO_DEV_ATMEL_TDES and CRYPTO_DEV_ATMEL_SHA should depend on HAS_DMA crypto: cavium - fix leak on curr if curr->head fails to be allocated crypto: cavium - Fix couple of static checker errors
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git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfsLinus Torvalds authored
Pull misc final vfs updates from Al Viro: "A few unrelated patches that got beating in -next. Everything else will have to go into the next window ;-/" * 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: hfs: fix hfs_readdir() selftest for default_file_splice_read() infoleak 9p: constify ->d_name handling
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git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsiLinus Torvalds authored
Pull more SCSI updates from James Bottomley: "This is the set of stuff that didn't quite make the initial pull and a set of fixes for stuff which did. The new stuff is basically lpfc (nvme), qedi and aacraid. The fixes cover a lot of previously submitted stuff, the most important of which probably covers some of the failing irq vectors allocation and other fallout from having the SCSI command allocated as part of the block allocation functions" * tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (59 commits) scsi: qedi: Fix memory leak in tmf response processing. scsi: aacraid: remove redundant zero check on ret scsi: lpfc: use proper format string for dma_addr_t scsi: lpfc: use div_u64 for 64-bit division scsi: mac_scsi: Fix MAC_SCSI=m option when SCSI=m scsi: cciss: correct check map error. scsi: qla2xxx: fix spelling mistake: "seperator" -> "separator" scsi: aacraid: Fixed expander hotplug for SMART family scsi: mpt3sas: switch to pci_alloc_irq_vectors scsi: qedf: fixup compilation warning about atomic_t usage scsi: remove scsi_execute_req_flags scsi: merge __scsi_execute into scsi_execute scsi: simplify scsi_execute_req_flags scsi: make the sense header argument to scsi_test_unit_ready mandatory scsi: sd: improve TUR handling in sd_check_events scsi: always zero sshdr in scsi_normalize_sense scsi: scsi_dh_emc: return success in clariion_std_inquiry() scsi: fix memory leak of sdpk on when gd fails to allocate scsi: sd: make sd_devt_release() static scsi: qedf: Add QLogic FastLinQ offload FCoE driver framework. ...
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WANG Cong authored
Fixes: 43a0c675 ("strparser: Stream parser for messages") Cc: Tom Herbert <tom@herbertland.com> Signed-off-by:
Cong Wang <xiyou.wangcong@gmail.com> Signed-off-by:
David S. Miller <davem@davemloft.net>
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git://git.kernel.org/pub/scm/linux/kernel/git/pablo/nfDavid S. Miller authored
Pablo Neira Ayuso says: ==================== Netfilter fixes for net The following patchset contains Netfilter fixes for your net tree, they are: 1) Missing check for full sock in ip_route_me_harder(), from Florian Westphal. 2) Incorrect sip helper structure initilization that breaks it when several ports are used, from Christophe Leroy. 3) Fix incorrect assumption when looking up for matching with adjacent intervals in the nft_set_rbtree. 4) Fix broken netlink event error reporting in nf_tables that results in misleading ESRCH errors propagated to userspace listeners. ==================== Signed-off-by: -
git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimmLinus Torvalds authored
Pull libnvdimm fixes from Dan Williams: "A fix and regression test case for nvdimm namespace label compatibility. Details: - An "nvdimm namespace label" is metadata on an nvdimm that provisions dimm capacity into a "namespace" that can host a block device / dax-filesytem, or a device-dax character device. A namespace is an object that other operating environment and platform firmware needs to comprehend for capabilities like booting from an nvdimm. The label metadata contains a checksum that Linux was not calculating correctly leading to other environments rejecting the Linux label. These have received a build success notification from the kbuild robot, and a positive test result from Nick who reported the problem" * 'libnvdimm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: nfit, libnvdimm: fix interleave set cookie calculation tools/testing/nvdimm: make iset cookie predictable -
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pciLinus Torvalds authored
Pull PCI fixes from Bjorn Helgaas: - fix NULL pointer dereferences in many DesignWare-based drivers due to refactoring error - fix Altera config write breakage due to my refactoring error * tag 'pci-v4.11-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci: PCI: altera: Fix TLP_CFG_DW0 for TLP write PCI: dwc: Fix crashes seen due to missing assignments
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git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linuxLinus Torvalds authored
Pull parisc fixes and cleanups from Helge Deller: "Nothing really important in this patchset: fix resource leaks in error paths, coding style cleanups and code removal" * 'parisc-4.11-1' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux: parisc: Remove flush_user_dcache_range and flush_user_icache_range parisc: fix a printk parisc: ccio-dma: Handle return NULL error from ioremap_nocache parisc: Define access_ok() as macro parisc: eisa: Fix resource leaks in error paths parisc: eisa: Remove coding style errors
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git://github.com/jcmvbkbc/linux-xtensaLinus Torvalds authored
Pull Xtensa updates from Max Filippov: - clean up bootable image build targets: provide separate 'Image', 'zImage' and 'uImage' make targets that only build corresponding image type. Make 'all' build all images appropriate for a platform - allow merging vectors code into .text section as a preparation step for XIP support - fix handling external FDT when the kernel is built without BLK_DEV_INITRD support * tag 'xtensa-20170303' of git://github.com/jcmvbkbc/linux-xtensa: xtensa: allow merging vectors into .text section xtensa: clean up bootable image build targets xtensa: move parse_tag_fdt out of #ifdef CONFIG_BLK_DEV_INITRD
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git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-socLinus Torvalds authored
Pull ARM SoC late DT updates from Arnd Bergmann: "These updates have been kept in a separate branch mostly because they rely on updates to the respective clk drivers to keep the shared header files in sync. This includes two branches for arm64 dt updates, both following up on earlier changes for the same platforms that are already merged: Samsung: - add USB3 support in Exynos7 - minor PM related updates Amlogic: - new machines: WeTek Set-top-boxes - various devices added to DT There are also a couple of bugfixes that trickled in since the start of the merge window: - The moxart_defconfig was not building the intended platform - CPU-hotplug was broken on ux500 - Coresight was broken on Juno (never worked)" * tag 'armsoc-late' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc: (26 commits) ARM: deconfig: fix the moxart defconfig ARM: ux500: resume the second core properly arm64: dts: juno: update definition for programmable replicator arm64: dts: exynos: Add regulators for Vbus and Vbus-Boost arm64: dts: exynos: Add USB 3.0 controller node for Exynos7 arm64: dts: exynos: Use macros for pinctrl configuration on Exynos7 pinctrl: dt-bindings: samsung: Add Exynos7 specific pinctrl macro definitions arm64: dts: exynos: Add initial configuration for DISP clocks for TM2/TM2e ARM64: dts: meson-gxbb-p200: add ADC laddered keys ARM64: dts: meson: meson-gx: add the SAR ADC ARM64: dts: meson-gxl: add the pwm_ao_b pin ARM64: dts: meson-gx: add the missing pwm_AO_ab node clk: gxbb: fix CLKID_ETH defined twice ARM64: dts: meson-gxl: rename Nexbox A95x for consistency clk: gxbb: add the SAR ADC clocks and expose them dt-bindings: amlogic: Add WeTek boards ARM64: dts: meson-gxbb: Add support for WeTek Hub and Play dt-bindings: vendor-prefix: Add wetek vendor prefix ARM64: dts: meson-gxm: Rename q200 and q201 DT files for consistency ARM64: dts: meson-gx: Add HDMI HPD/DDC pinctrl nodes ...
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