- 13 Aug, 2018 15 commits
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: PEVENT_FILTER_ERROR_BUFSZ, pevent_filter_alloc, pevent_filter_add_filter_str, pevent_filter_match, pevent_filter_strerror, pevent_event_filtered, pevent_filter_reset, pevent_filter_clear_trivial, pevent_filter_free, pevent_filter_make_string, pevent_filter_remove_event, pevent_filter_event_has_trivial, pevent_filter_copy, pevent_update_trivial, pevent_filter_compare Signed-off-by:
Tzvetomir Stoyanov (VMware) <tz.stoyanov@gmail.com> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Yordan Karadzhov (VMware) <y.karadz@gmail.com> Cc: linux-trace-devel@vger.kernel.org Link: http://lkml.kernel.org/r/20180808180702.370659353@goodmis.orgSigned-off-by:
Steven Rostedt <rostedt@goodmis.org> Signed-off-by:
Arnaldo Carvalho de Melo <acme@redhat.com>
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "traceevent_". This changes APIs: traceevent_plugin_list_options, traceevent_plugin_free_options_list, traceevent_plugin_add_options, traceevent_plugin_remove_options, traceevent_print_plugins Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_function_handler, pevent_func_handler, pevent_func_arg_type, PEVENT_FUNC_ARG_VOID, PEVENT_FUNC_ARG_INT, PEVENT_FUNC_ARG_LONG, PEVENT_FUNC_ARG_STRING, PEVENT_FUNC_ARG_PTRS, PEVENT_FUNC_ARG_MAX_TYPES Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes 'enum pevent_errno' to 'enum tep_errno'. Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes pevent_get_page_size API and enum pevent_flag to enum tep_flag Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "traceevent_". This changes APIs: traceevent_host_bigendian, traceevent_load_plugins and traceevent_unload_plugins Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_set_file_bigendian, pevent_set_flag, pevent_set_function_resolver, pevent_set_host_bigendian, pevent_set_long_size, pevent_set_page_size and pevent_get_long_size Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_register_comm, pevent_register_print_string Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_read_number, pevent_read_number_field Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_print_field, pevent_print_fields, pevent_print_funcs, pevent_print_printk Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_parse_event, pevent_parse_format, pevent_parse_header_page Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_find_any_field, pevent_find_common_field, pevent_find_event, pevent_find_field Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes APIs: pevent_alloc, pevent_free, pevent_event_info and pevent_func_resolver_t Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes the pevent plugin related API. Signed-off-by:
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes the 'struct pevent_record' to 'struct tep_record'. Signed-off-by:
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- 10 Aug, 2018 1 commit
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Tzvetomir Stoyanov (VMware) authored
In order to make libtraceevent into a proper library, variables, data structures and functions require a unique prefix to prevent name space conflicts. That prefix will be "tep_" and not "pevent_". This changes the struct pevent to struct tep_handle. Signed-off-by:
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- 09 Aug, 2018 1 commit
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Sandipan Das authored
In some cases, a symbol may have multiple aliases. Attempting to add an entry probe for such symbols results in a probe being added at an incorrect location while it fails altogether for return probes. This is only applicable for binaries with debug information. During the arch-dependent post-processing, the offset from the start of the symbol at which the probe is to be attached is determined and added to the start address of the symbol to get the probe's location. In case there are multiple aliases, this offset gets added multiple times for each alias of the symbol and we end up with an incorrect probe location. This can be verified on a powerpc64le system as shown below. $ nm /lib/modules/$(uname -r)/build/vmlinux | grep "sys_open$" ... c000000000414290 T __se_sys_open c000000000414290 T sys_open $ objdump -d /lib/modules/$(uname -r)/build/vmlinux | grep -A 10 "<__se_sys_open>:" c000000000414290 <__se_sys_open>: c000000000414290: 19 01 4c 3c addis r2,r12,281 c000000000414294: 70 c4 42 38 addi r2,r2,-15248 c000000000414298: a6 02 08 7c mflr r0 c00000000041429c: e8 ff a1 fb std r29,-24(r1) c0000000004142a0: f0 ff c1 fb std r30,-16(r1) c0000000004142a4: f8 ff e1 fb std r31,-8(r1) c0000000004142a8: 10 00 01 f8 std r0,16(r1) c0000000004142ac: c1 ff 21 f8 stdu r1,-64(r1) c0000000004142b0: 78 23 9f 7c mr r31,r4 c0000000004142b4: 78 1b 7e 7c mr r30,r3 For both the entry probe and the return probe, the probe location should be _text+4276888 (0xc000000000414298). Since another alias exists for 'sys_open', the post-processing code will end up adding the offset (8 for powerpc64le) twice and perf will attempt to add the probe at _text+4276896 (0xc0000000004142a0) instead. Before: # perf probe -v -a sys_open probe-definition(0): sys_open symbol:sys_open file:(null) line:0 offset:0 return:0 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /lib/modules/4.18.0-rc8+/build/vmlinux for symbols Open Debuginfo file: /lib/modules/4.18.0-rc8+/build/vmlinux Try to find probe point from debuginfo. Symbol sys_open address found : c000000000414290 Matched function: __se_sys_open [2ad03a0] Probe point found: __se_sys_open+0 Found 1 probe_trace_events. Opening /sys/kernel/debug/tracing/kprobe_events write=1 Writing event: p:probe/sys_open _text+4276896 Added new event: probe:sys_open (on sys_open) ... # perf probe -v -a sys_open%return $retval probe-definition(0): sys_open%return symbol:sys_open file:(null) line:0 offset:0 return:1 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /lib/modules/4.18.0-rc8+/build/vmlinux for symbols Open Debuginfo file: /lib/modules/4.18.0-rc8+/build/vmlinux Try to find probe point from debuginfo. Symbol sys_open address found : c000000000414290 Matched function: __se_sys_open [2ad03a0] Probe point found: __se_sys_open+0 Found 1 probe_trace_events. Opening /sys/kernel/debug/tracing/README write=0 Opening /sys/kernel/debug/tracing/kprobe_events write=1 Parsing probe_events: p:probe/sys_open _text+4276896 Group:probe Event:sys_open probe:p Writing event: r:probe/sys_open__return _text+4276896 Failed to write event: Invalid argument Error: Failed to add events. Reason: Invalid argument (Code: -22) After: # perf probe -v -a sys_open probe-definition(0): sys_open symbol:sys_open file:(null) line:0 offset:0 return:0 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /lib/modules/4.18.0-rc8+/build/vmlinux for symbols Open Debuginfo file: /lib/modules/4.18.0-rc8+/build/vmlinux Try to find probe point from debuginfo. Symbol sys_open address found : c000000000414290 Matched function: __se_sys_open [2ad03a0] Probe point found: __se_sys_open+0 Found 1 probe_trace_events. Opening /sys/kernel/debug/tracing/kprobe_events write=1 Writing event: p:probe/sys_open _text+4276888 Added new event: probe:sys_open (on sys_open) ... # perf probe -v -a sys_open%return $retval probe-definition(0): sys_open%return symbol:sys_open file:(null) line:0 offset:0 return:1 lazy:(null) 0 arguments Looking at the vmlinux_path (8 entries long) Using /lib/modules/4.18.0-rc8+/build/vmlinux for symbols Open Debuginfo file: /lib/modules/4.18.0-rc8+/build/vmlinux Try to find probe point from debuginfo. Symbol sys_open address found : c000000000414290 Matched function: __se_sys_open [2ad03a0] Probe point found: __se_sys_open+0 Found 1 probe_trace_events. Opening /sys/kernel/debug/tracing/README write=0 Opening /sys/kernel/debug/tracing/kprobe_events write=1 Parsing probe_events: p:probe/sys_open _text+4276888 Group:probe Event:sys_open probe:p Writing event: r:probe/sys_open__return _text+4276888 Added new event: probe:sys_open__return (on sys_open%return) ... Reported-by:Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by:
Sandipan Das <sandipan@linux.ibm.com> Acked-by:
Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com> Cc: Aneesh Kumar <aneesh.kumar@linux.vnet.ibm.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Ravi Bangoria <ravi.bangoria@linux.ibm.com> Fixes: 99e608b5 ("perf probe ppc64le: Fix probe location when using DWARF") Link: http://lkml.kernel.org/r/20180809161929.35058-1-sandipan@linux.ibm.comSigned-off-by:
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- 08 Aug, 2018 23 commits
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Konstantin Khlebnikov authored
This function splits and removes overlapping areas. Maps in tree are ordered by start address thus we could find first overlap and stop if next map does not overlap. Signed-off-by:
Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by:
Jiri Olsa <jolsa@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/153365189407.435244.7234821822450484712.stgit@buzzSigned-off-by:
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Konstantin Khlebnikov authored
Threads share map_groups, all map events are merged into it. Thus we could send mmaps only for thread group leader. Otherwise it took ages to attach and record something from processes with many vmas and threads. Thread group leader could be already dead, but it seems perf cannot handle this case anyway. Testing dummy: #include <stdio.h> #include <stdlib.h> #include <sys/mman.h> #include <pthread.h> #include <unistd.h> void *thread(void *arg) { pause(); } int main(int argc, char **argv) { int threads = 10000; int vmas = 50000; pthread_t th; for (int i = 0; i < threads; i++) pthread_create(&th, NULL, thread, NULL); for (int i = 0; i < vmas; i++) mmap(NULL, 4096, (i & 1) ? PROT_READ : PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE, -1, 0); sleep(60); return 0; } Comment by Jiri Olsa: We actualy synthesize the group leader (if we found one) for the thread even if it's not present in the thread_map, so the process maps are always in data. Signed-off-by: -
Arnaldo Carvalho de Melo authored
We just check that the evsel is the one we associated with the bpf-output event associated with the "__augmented_syscalls__" eBPF map, to show that the formatting is done properly: # perf trace -e perf/tools/perf/examples/bpf/augmented_syscalls.c,openat cat /etc/passwd > /dev/null 0.000 ( ): __augmented_syscalls__:dfd: CWD, filename: 0x43e06da8, flags: CLOEXEC 0.006 ( ): syscalls:sys_enter_openat:dfd: CWD, filename: 0x43e06da8, flags: CLOEXEC 0.007 ( 0.004 ms): cat/11486 openat(dfd: CWD, filename: 0x43e06da8, flags: CLOEXEC ) = 3 0.029 ( ): __augmented_syscalls__:dfd: CWD, filename: 0x4400ece0, flags: CLOEXEC 0.030 ( ): syscalls:sys_enter_openat:dfd: CWD, filename: 0x4400ece0, flags: CLOEXEC 0.031 ( 0.004 ms): cat/11486 openat(dfd: CWD, filename: 0x4400ece0, flags: CLOEXEC ) = 3 0.249 ( ): __augmented_syscalls__:dfd: CWD, filename: 0xc3700d6 0.250 ( ): syscalls:sys_enter_openat:dfd: CWD, filename: 0xc3700d6 0.252 ( 0.003 ms): cat/11486 openat(dfd: CWD, filename: 0xc3700d6 ) = 3 # Now we just need to get the full blown enter/exit handlers to check if the evsel being processed is the augmented_syscalls one to go pick the pointer payloads from the end of the payload. We also need to state somehow what is the layout for multi pointer arg syscalls. Also handy would be to have a BTF file with the struct definitions used in syscalls, compact, generated at kernel built time and available for use in eBPF programs. Till we get there we can go on doing some manual coupling of the most relevant syscalls with some hand built beautifiers. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-r6ba5izrml82nwfmwcp7jpkm@git.kernel.orgSigned-off-by: -
Arnaldo Carvalho de Melo authored
The payload that is put in place by the eBPF script attached to syscalls:sys_enter_openat (and other syscalls with pointers, in the future) can be consumed by the existing sys_enter beautifiers if evsel->priv is setup with a struct syscall_tp with struct tp_fields for the 'syscall_id' and 'args' fields expected by the beautifiers, this patch does just that. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-xfjyog8oveg2fjys9r1yy1es@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
We're calling it to setup that event, and we'll need it later to decide if the bpf-output event we're handling is the one setup for a specific purpose, return it using ERR_PTR, etc. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-zhachv7il2n1lopt9aonwhu7@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
Add an example BPF script that writes syscalls:sys_enter_openat raw tracepoint payloads augmented with the first 64 bytes of the "filename" syscall pointer arg. Then catch it and print it just like with things written to the "__bpf_stdout__" map associated with a PERF_COUNT_SW_BPF_OUTPUT software event, by just letting the default tracepoint handler in 'perf trace', trace__event_handler(), to use bpf_output__fprintf(trace, sample), just like it does with all other PERF_COUNT_SW_BPF_OUTPUT events, i.e. just do a dump on the payload, so that we can check if what is being printed has at least the first 64 bytes of the "filename" arg: The augmented_syscalls.c eBPF script: # cat tools/perf/examples/bpf/augmented_syscalls.c // SPDX-License-Identifier: GPL-2.0 #include <stdio.h> struct bpf_map SEC("maps") __augmented_syscalls__ = { .type = BPF_MAP_TYPE_PERF_EVENT_ARRAY, .key_size = sizeof(int), .value_size = sizeof(u32), .max_entries = __NR_CPUS__, }; struct syscall_enter_openat_args { unsigned long long common_tp_fields; long syscall_nr; long dfd; char *filename_ptr; long flags; long mode; }; struct augmented_enter_openat_args { struct syscall_enter_openat_args args; char filename[64]; }; int syscall_enter(openat)(struct syscall_enter_openat_args *args) { struct augmented_enter_openat_args augmented_args; probe_read(&augmented_args.args, sizeof(augmented_args.args), args); probe_read_str(&augmented_args.filename, sizeof(augmented_args.filename), args->filename_ptr); perf_event_output(args, &__augmented_syscalls__, BPF_F_CURRENT_CPU, &augmented_args, sizeof(augmented_args)); return 1; } license(GPL); # So it will just prepare a raw_syscalls:sys_enter payload for the "openat" syscall. This will eventually be done for all syscalls with pointer args, globally or just when the user asks, using some spec, which args of which syscalls it wants "expanded" this way, we'll probably start with just all the syscalls that have char * pointers with familiar names, the ones we already handle with the probe:vfs_getname kprobe if it is in place hooking the kernel getname_flags() function used to copy from user the paths. Running it we get: # perf trace -e perf/tools/perf/examples/bpf/augmented_syscalls.c,openat cat /etc/passwd > /dev/null 0.000 ( ): __augmented_syscalls__:X?.C......................`\..................../etc/ld.so.cache..#......,....ao.k...............k......1."......... 0.006 ( ): syscalls:sys_enter_openat:dfd: CWD, filename: 0x5c600da8, flags: CLOEXEC 0.008 ( 0.005 ms): cat/31292 openat(dfd: CWD, filename: 0x5c600da8, flags: CLOEXEC ) = 3 0.036 ( ): __augmented_syscalls__:X?.C.......................\..................../lib64/libc.so.6......... .\....#........?.......=.C..../."......... 0.037 ( ): syscalls:sys_enter_openat:dfd: CWD, filename: 0x5c808ce0, flags: CLOEXEC 0.039 ( 0.007 ms): cat/31292 openat(dfd: CWD, filename: 0x5c808ce0, flags: CLOEXEC ) = 3 0.323 ( ): __augmented_syscalls__:X?.C.....................P....................../etc/passwd......>.C....@................>.C.....,....ao.>.C........ 0.325 ( ): syscalls:sys_enter_openat:dfd: CWD, filename: 0xe8be50d6 0.327 ( 0.004 ms): cat/31292 openat(dfd: CWD, filename: 0xe8be50d6 ) = 3 # We need to go on optimizing this to avoid seding trash or zeroes in the pointer content payload, using the return from bpf_probe_read_str(), but to keep things simple at this stage and make incremental progress, lets leave it at that for now. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-g360n1zbj6bkbk6q0qo11c28@git.kernel.orgSigned-off-by: -
Arnaldo Carvalho de Melo authored
Will be used shortly in the augmented syscalls work together with a PERF_COUNT_SW_BPF_OUTPUT software event to insert syscalls + pointer contents in the perf ring buffer, to be consumed by 'perf trace' beautifiers. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-ajlkpz4cd688ulx1u30htkj3@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
That is just bpf__strerror_setup_stdout() renamed to the more general "setup_output_event" method, keep the existing stdout() as a wrapper. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-nwnveo428qn0b48axj50vkc7@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
We will use it to set up other bpf-output events, for instance to generate augmented syscall entry tracepoints with pointer contents. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-4r7kw0nsyi4vyz6xm1tzx6a3@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
By passing a 'name' arg, that will eventually be used to setup more "bpf-output" events, e.g. to create a event where to create raw_syscalls like events that in addition to the syscall arguments will also copy the pointer contents being passed from/to userspace. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-talrnxps9p3qozk3aeh91fgv@git.kernel.orgSigned-off-by:
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Arnaldo Carvalho de Melo authored
That, together with the map __bpf_output__ that is already handled by 'perf trace' to print that event's contents as strings provides a debugging facility, to show it in use, print a simple string everytime the syscalls:sys_enter_openat() syscall tracepoint is hit: # cat tools/perf/examples/bpf/hello.c #include <stdio.h> int syscall_enter(openat)(void *args) { puts("Hello, world\n"); return 0; } license(GPL); # # perf trace -e openat,tools/perf/examples/bpf/hello.c cat /etc/passwd > /dev/null 0.016 ( ): __bpf_stdout__:Hello, world 0.018 ( 0.010 ms): cat/9079 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC) = 3 0.057 ( ): __bpf_stdout__:Hello, world 0.059 ( 0.011 ms): cat/9079 openat(dfd: CWD, filename: /lib64/libc.so.6, flags: CLOEXEC) = 3 0.417 ( ): __bpf_stdout__:Hello, world 0.419 ( 0.009 ms): cat/9079 openat(dfd: CWD, filename: /etc/passwd) = 3 # This is part of an ongoing experimentation on making eBPF scripts as consumed by perf to be as concise as possible and using familiar concepts such as stdio.h functions, that end up just wrapping the existing BPF functions, trying to hide as much boilerplate as possible while using just conventions and C preprocessor tricks. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-4tiaqlx5crf0fwpe7a6j84x7@git.kernel.orgSigned-off-by: -
Arnaldo Carvalho de Melo authored
A helper structure used by eBPF C program to describe map attributes to elf_bpf loader, to be used initially by the special __bpf_stdout__ map used to print strings into the perf ring buffer in BPF scripts, e.g.: Using the upcoming stdio.h and puts() macros to use the __bpf_stdout__ map to add strings to the ring buffer: # cat tools/perf/examples/bpf/hello.c #include <stdio.h> int syscall_enter(openat)(void *args) { puts("Hello, world\n"); return 0; } license(GPL); # # cat ~/.perfconfig [llvm] dump-obj = true # perf trace -e openat,tools/perf/examples/bpf/hello.c/call-graph=dwarf/ cat /etc/passwd > /dev/null LLVM: dumping tools/perf/examples/bpf/hello.o 0.016 ( ): __bpf_stdout__:Hello, world 0.018 ( 0.010 ms): cat/9079 openat(dfd: CWD, filename: /etc/ld.so.cache, flags: CLOEXEC ) = 3 0.057 ( ): __bpf_stdout__:Hello, world 0.059 ( 0.011 ms): cat/9079 openat(dfd: CWD, filename: /lib64/libc.so.6, flags: CLOEXEC ) = 3 0.417 ( ): __bpf_stdout__:Hello, world 0.419 ( 0.009 ms): cat/9079 openat(dfd: CWD, filename: /etc/passwd ) = 3 # # file tools/perf/examples/bpf/hello.o tools/perf/examples/bpf/hello.o: ELF 64-bit LSB relocatable, *unknown arch 0xf7* version 1 (SYSV), not stripped # readelf -SW tools/perf/examples/bpf/hello.o There are 10 section headers, starting at offset 0x208: Section Headers: [Nr] Name Type Address Off Size ES Flg Lk Inf Al [ 0] NULL 0000000000000000 000000 000000 00 0 0 0 [ 1] .strtab STRTAB 0000000000000000 000188 00007f 00 0 0 1 [ 2] .text PROGBITS 0000000000000000 000040 000000 00 AX 0 0 4 [ 3] syscalls:sys_enter_openat PROGBITS 0000000000000000 000040 000088 00 AX 0 0 8 [ 4] .relsyscalls:sys_enter_openat REL 0000000000000000 000178 000010 10 9 3 8 [ 5] maps PROGBITS 0000000000000000 0000c8 00001c 00 WA 0 0 4 [ 6] .rodata.str1.1 PROGBITS 0000000000000000 0000e4 00000e 01 AMS 0 0 1 [ 7] license PROGBITS 0000000000000000 0000f2 000004 00 WA 0 0 1 [ 8] version PROGBITS 0000000000000000 0000f8 000004 00 WA 0 0 4 [ 9] .symtab SYMTAB 0000000000000000 000100 000078 18 1 1 8 Key to Flags: W (write), A (alloc), X (execute), M (merge), S (strings), I (info), L (link order), O (extra OS processing required), G (group), T (TLS), C (compressed), x (unknown), o (OS specific), E (exclude), p (processor specific) # readelf -s tools/perf/examples/bpf/hello.o Symbol table '.symtab' contains 5 entries: Num: Value Size Type Bind Vis Ndx Name 0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND 1: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 5 __bpf_stdout__ 2: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 7 _license 3: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 8 _version 4: 0000000000000000 0 NOTYPE GLOBAL DEFAULT 3 syscall_enter_openat # Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-81fg60om2ifnatsybzwmiga3@git.kernel.orgSigned-off-by: -
Jiri Olsa authored
Set annotation percent type from following choices: global-period, local-period, global-hits, local-hits With following report option setup the percent type will be passed to annotation browser: $ perf report --percent-type period-local The local/global keywords set if the percentage is computed in the scope of the function (local) or the whole data (global). The period/hits keywords set the base the percentage is computed on - the samples period or the number of samples (hits). Signed-off-by:
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Jiri Olsa authored
Add --percent-type option to set annotation percent type from following choices: global-period, local-period, global-hits, local-hits Examples: $ perf annotate --percent-type period-local --stdio | head -1 Percent | Source code ... es, percent: local period) $ perf annotate --percent-type hits-local --stdio | head -1 Percent | Source code ... es, percent: local hits) $ perf annotate --percent-type hits-global --stdio | head -1 Percent | Source code ... es, percent: global hits) $ perf annotate --percent-type period-global --stdio | head -1 Percent | Source code ... es, percent: global period) The local/global keywords set if the percentage is computed in the scope of the function (local) or the whole data (global). The period/hits keywords set the base the percentage is computed on - the samples period or the number of samples (hits). Signed-off-by:
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Jiri Olsa authored
In following patches we will allow to switch percent type even for stdio annotation outputs. Adding the percent type value into the annotation outputs title. $ perf annotate --stdio Percent | Sou ... instructions:u } (2805 samples, percent: local period) --------------------------- ... ------------------------------------------------------ ... $ perf annotate --stdio2 Samples: 2K of events 'anon ... count (approx.): 156525487, [percent: local period] safe_write.c() /usr/bin/yes Percent ... Signed-off-by:
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Jiri Olsa authored
Currently we display the percentages in annotation output based on number of samples hits. Switching it to period based percentage by default, because it corresponds more to the time spent on the line. Signed-off-by:
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Jiri Olsa authored
Add new key bindings to toggle percent type/base in annotation UI browser: 'p' to switch between local and global percent type 'b' to switch between hits and perdio percent base Add the following help messages to the UI browser '?' window: ... p Toggle percent type [local/global] b Toggle percent base [period/hits] ... Signed-off-by:
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Jiri Olsa authored
Pass browser percent_type in annotate_browser__calc_percent(). Signed-off-by:
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Jiri Olsa authored
Pass 'struct annotation_options' to map_symbol__annotation_dump(), to carry on and pass the percent_type value. Signed-off-by:
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Jiri Olsa authored
Pass struct annotation_options to symbol__calc_lines(), to carry on and pass the percent_type value. Signed-off-by:
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Jiri Olsa authored
It will be used to carry user selection of percent type for annotation output. Passing the percent_type to the annotation_line__print function as the first step and making it default to current percentage type (PERCENT_HITS_LOCAL) value. Signed-off-by:
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Jiri Olsa authored
Adding and computing global period percent value for annotation line. Storing it in struct annotation_data percent array under new PERCENT_PERIOD_GLOBAL index. At the moment it's not displayed, it's coming in following patches. Signed-off-by:
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Jiri Olsa authored
Adding and computing local period percent value for annotation line. Storing it in struct annotation_data percent array under new PERCENT_PERIOD_LOCAL index. At the moment it's not displayed, it's coming in following patches. Signed-off-by:
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