- 13 Mar, 2009 39 commits
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Ingo Molnar authored
Impact: cleanup, no code changed Cc: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313104218.A30096@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Markus Metzger authored
Add a selftest for the hw-branch-tracer. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313105027.A30183@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Markus Metzger authored
Distinguish init/reset and start/stop: init/reset will allocate and release bts tracing resources stop/start will suspend and resume bts tracing Return an error on init() if no cpu can be traced. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313104852.A30168@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Markus Metzger authored
Correct the comment style in ds.c. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313104642.A30149@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Markus Metzger authored
Perform a selftest of branch trace store when a cpu is initialized. WARN and disable branch trace store support if the selftest fails. Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313104507.A30125@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Markus Metzger authored
Impact: more robust DS feature enumeration Detect the size of the pointer-type fields in the DS area configuration via the DTES64 features rather than based on the cpuid. Rename a variable to denote that size to reflect that it only covers the pointer-type fields. Add more boot-time diagnostics giving the detected size and the sizes of BTS and PEBS records. Use the size of the BTS/PEBS record to indicate that the respective feature is not available (if the record size is zero). Signed-off-by: Markus Metzger <markus.t.metzger@intel.com> LKML-Reference: <20090313104218.A30096@sedona.ch.intel.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Ingo Molnar authored
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Ingo Molnar authored
Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace
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Ingo Molnar authored
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Frederic Weisbecker authored
Provide the x86 trace callbacks to trace syscalls. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <1236401580-5758-3-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Frederic Weisbecker authored
Provide basic callbacks to do syscall tracing. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Steven Rostedt <rostedt@goodmis.org> Cc: Lai Jiangshan <laijs@cn.fujitsu.com> LKML-Reference: <1236401580-5758-2-git-send-email-fweisbec@gmail.com> [ simplified it to a trace_printk() for now. ] Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Steven Rostedt authored
Impact: clean up It is redundant to have 'SOFTIRQ' in the softirq names. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
The binary_buffers directory in /debugfs/tracing held the files to read the trace buffers in a binary format. This held one file per CPU buffer. But we also have a per_cpu directory that holds a way to read the pretty-print formats. This patch moves the binary buffers into the per_cpu_directory: # ls /debug/tracing/per_cpu/cpu1/ trace trace_pipe trace_pipe_raw The new name is called "trace_pipe_raw". The binary buffers always acted similar to trace_pipe, except that they produce raw data. Requested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Impact: documentation The use of the double __builtin_contant_p checks in the event_trace_printk can be confusing to developers and reviewers. This patch adds a comment to explain why it is there. Requested-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> LKML-Reference: <20090313122235.43EB.A69D9226@jp.fujitsu.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Ingo Molnar suggested, instead of: Depth Size Location (27 entries) ----- ---- -------- 0) 2880 48 lock_timer_base+0x2b/0x4f 1) 2832 80 __mod_timer+0x33/0xe0 2) 2752 16 __ide_set_handler+0x63/0x65 To have it be: Depth Size Location (27 entries) ----- ---- -------- 0) 2880 48 lock_timer_base+0x2b/0x4f 1) 2832 80 __mod_timer+0x33/0xe0 2) 2752 16 __ide_set_handler+0x63/0x65 Requested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Ingo Molnar authored
Merge branch 'tip/tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-2.6-trace into tracing/ftrace
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Ingo Molnar authored
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Linus Torvalds authored
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Linus Torvalds authored
Guennadi Liakhovetski noticed that the end condition for the loop in bitmap_find_free_region() is wrong, and the "return if error" was also using the wrong conditional that would only trigger if the bitmap was an exact multiple of the allocation size, which is not necessarily the case with dma_alloc_from_coherent(). Such a failure would end up in bitmap_find_free_region() accessing beyond the end of the bitmap. Reported-by: Guennadi Liakhovetski <lg@denx.de> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Steven Rostedt authored
In a private email conversation I explained how the ring buffer page worked by using silly ASCII art. Ingo suggested that I add that to the comments of the code. Here it is. Requested-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Unlike TRACE_FORMAT() macros, the TRACE_EVENT() macros do not show the event name in the trace file. Knowing the event type in the trace output is very useful. Instead of: task swapper:0 [140] ==> ntpd:3308 [120] We now have: sched_switch: task swapper:0 [140] ==> ntpd:3308 [120] Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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KOSAKI Motohiro authored
commit c3ffc7a4 "Don't use tracing_record_cmdline() in workqueue tracer" has a race window. find_task_by_vpid() requires task_list_lock(). LKML-Reference: <20090313090042.43CD.A69D9226@jp.fujitsu.com> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Jason Baron authored
Introduce softirq entry/exit tracepoints. These are useful for augmenting existing tracers, and to figure out softirq frequencies and timings. [ s/irq_softirq_/softirq_/ for trace point names and Fixed printf format in TRACE_FORMAT macro - Steven Rostedt ] LKML-Reference: <20090312183603.GC3352@redhat.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Jason Baron authored
Create a 'softirq_to_name' array, which is indexed by softirq #, so that we can easily convert between the softirq index # and its name, in order to get more meaningful output messages. LKML-Reference: <20090312183336.GB3352@redhat.com> Signed-off-by: Jason Baron <jbaron@redhat.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
If the stack tracing is disabled (by default) the stack_trace file will only contain the header: # cat /debug/tracing/stack_trace Depth Size Location (0 entries) ----- ---- -------- This can be frustrating to a developer that does not realize that the stack tracer is disabled. This patch adds the following text: # cat /debug/tracing/stack_trace Depth Size Location (0 entries) ----- ---- -------- # # Stack tracer disabled # # To enable the stack tracer, either add 'stacktrace' to the # kernel command line # or 'echo 1 > /proc/sys/kernel/stack_tracer_enabled' # Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
The stack tracer use to look like this: # cat /debug/tracing/stack_trace Depth Size Location (57 entries) ----- ---- -------- 0) 5088 16 mempool_alloc_slab+0x16/0x18 1) 5072 144 mempool_alloc+0x4d/0xfe 2) 4928 16 scsi_sg_alloc+0x48/0x4a [scsi_mod] Now it looks like this: # cat /debug/tracing/stack_trace Depth Size Location (57 entries) ----- ---- -------- 0) 5088 16 mempool_alloc_slab+0x16/0x18 1) 5072 144 mempool_alloc+0x4d/0xfe 2) 4928 16 scsi_sg_alloc+0x48/0x4a [scsi_mod] Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
The binary printk saves a pointer to the format string in the ring buffer. On output, the format is processed. But if the user is reading the ring buffer through a binary interface, the pointer is meaningless. This patch creates a file called printk_formats that maps the pointers to the formats. # cat /debug/tracing/printk_formats 0xffffffff80713d40 : "irq_handler_entry: irq=%d handler=%s\n" 0xffffffff80713d48 : "lock_acquire: %s%s%s\n" 0xffffffff80713d50 : "lock_release: %s\n" Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Impact: speed up on event tracing The event_trace_printk is currently a wrapper function that calls trace_vprintk. Because it uses a variable for the fmt it misses out on the optimization of using the binary printk. This patch makes event_trace_printk into a macro wrapper to use the fmt as the same as the trace_printks. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
The bprint record is using TRACE_PRINT when it should be TRACE_BPRINT. Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Frederic Weisbecker authored
Impact: fix callsites with dynamic format strings Since its new binary implementation, trace_printk() internally uses static containers for the format strings on each callsites. But the value is assigned once at build time, which means that it can't take dynamic formats. So this patch unearthes the raw trace_printk implementation for the callers that will need trace_printk to be able to carry these dynamic format strings. The trace_printk() macro will use the appropriate implementation for each callsite. Most of the time however, the binary implementation will still be used. The other impact of this patch is that mmiotrace_printk() will use the old implementation because it calls the low level trace_vprintk and we can't guess here whether the format passed in it is dynamic or not. Some parts of this patch have been written by Steven Rostedt (most notably the part that chooses the appropriate implementation for each callsites). Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Impact: do not confuse user on small trace buffer sizes When the system boots up, the trace buffer is small to conserve memory. It is only two pages per online CPU. When the tracer is used, it expands to the default value. This can confuse the user if they look at the buffer size and see only 7, but then later they see 1408. # cat /debug/tracing/buffer_size_kb 7 # echo sched_switch > /debug/tracing/current_tracer # cat /debug/tracing/buffer_size_kb 1408 This patch tries to help remove this confustion by showing that the buffer has not been expanded. # cat /debug/tracing/buffer_size_kb 7 (expanded: 1408) Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Impact: speed up and remove possible races The get_online_cpus was added to the ring buffer because the original design would free the ring buffer on a CPU that was being taken off line. The final design kept the ring buffer around even when the CPU was taken off line. This is to allow a user to still read the information on that ring buffer. Most of the get_online_cpus are no longer needed since the ring buffer will not disappear from the use cases. Reported-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
The hotplug code in the ring buffers is for use with CPU hotplug, not generic hotplug. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Impact: prevent races with ring_buffer_expanded This patch places the expanding of the tracing buffer under the protection of the trace_types_lock mutex. It is highly unlikely that there would be any contention, but better safe than sorry. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Impact: cleanup Some of the comments about the trace buffer resizing is gobbledygook. And I wonder why people question if I'm a native English speaker. This patch makes the comments make a bit more sense. Reported-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Steven Rostedt <srostedt@redhat.com>
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Steven Rostedt authored
Merge branch 'tracing/ftrace' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip into trace/tip/tracing/ftrace-merge
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Ingo Molnar authored
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Ingo Molnar authored
Impact: cleanup The naming clashes with upcoming softirq tracepoints, so rename the APIs to lockdep_*(). Requested-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Ingo Molnar <mingo@elte.hu>
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Ingo Molnar authored
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- 12 Mar, 2009 1 commit
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git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixesLinus Torvalds authored
* git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-fixes: kbuild: remove unused -r option for module-init-tool depmod kbuild: fix 'make rpm' when CONFIG_LOCALVERSION_AUTO=y and using SCM tree kbuild: fix mkspec to cleanup RPM_BUILD_ROOT kbuild: fix C libary confusion in unifdef.c due to getline()
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