Commits · 2b70e59043f5a5ec083ea50cd2640aa49c64c675 · nexedi / linux

31 Oct, 2012 7 commits

tracing: Have tracing_sched_wakeup_trace() use standard unlock_commit · 2b70e590

Steven Rostedt authored Oct 11, 2012

The functon tracing_sched_wakeup_trace() does an open coded unlock
commit and save stack. This is what the trace_nowake_buffer_unlock_commit()
is for.
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

2b70e590

tracing: Enable comm recording if trace_printk() is used · 81698831

Steven Rostedt authored Oct 11, 2012

If comm recording is not enabled when trace_printk() is used then
you just get this type of output:

[ adding trace_printk("hello! %d", irq); in do_IRQ ]

           <...>-2843  [001] d.h.    80.812300: do_IRQ: hello! 14
           <...>-2734  [002] d.h2    80.824664: do_IRQ: hello! 14
           <...>-2713  [003] d.h.    80.829971: do_IRQ: hello! 14
           <...>-2814  [000] d.h.    80.833026: do_IRQ: hello! 14

By enabling the comm recorder when trace_printk is enabled:

       hackbench-6715  [001] d.h.   193.233776: do_IRQ: hello! 21
            sshd-2659  [001] d.h.   193.665862: do_IRQ: hello! 21
          <idle>-0     [001] d.h1   193.665996: do_IRQ: hello! 21
Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

81698831

tracing: Expand ring buffer when trace_printk() is used · b382ede6

Steven Rostedt authored Oct 10, 2012

Since tracing is not used by 99% of Linux users, even though tracing
may be configured in, it does not make sense to allocate 1.4 Megs
per CPU for the ring buffers if they are not used. Thus, on boot up
the ring buffers are set to a minimal size until something needs the
and they are expanded.

This works well for events and tracers (function, etc), but for the
asynchronous use of trace_printk() which can write to the ring buffer
at any time, does not expand the buffers.

On boot up a check is made to see if any trace_printk() is used to
see if the trace_printk() temp buffer pages should be allocated. This
same code can be used to expand the buffers as well.
Suggested-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

b382ede6

ring-buffer: Add a 'dropped events' counter · 884bfe89

Slava Pestov authored Jul 15, 2011

The existing 'overrun' counter is incremented when the ring
buffer wraps around, with overflow on (the default). We wanted
a way to count requests lost from the buffer filling up with
overflow off, too. I decided to add a new counter instead
of retro-fitting the existing one because it seems like a
different statistic to count conceptually, and also because
of how the code was structured.

Link: http://lkml.kernel.org/r/1310765038-26399-1-git-send-email-slavapestov@google.comSigned-off-by: Slava Pestov <slavapestov@google.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

884bfe89

tracing: Change tracer's integer flags to bool · f43c738b

Hiraku Toyooka authored Oct 02, 2012

print_max and use_max_tr in struct tracer are "int" variables and
used like flags. This is wasteful, so change the type to "bool".

Link: http://lkml.kernel.org/r/20121002082710.9807.86393.stgit@falsitaSigned-off-by: Hiraku Toyooka <hiraku.toyooka.gu@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

f43c738b

tracing: Allow tracers to start at core initcall · 6f415672

Steven Rostedt authored Oct 05, 2012

There's times during debugging that it is helpful to see traces of early
boot functions. But the tracers are initialized at device_initcall()
which is quite late during the boot process. Setting the kernel command
line parameter ftrace=function will not show anything until the function
tracer is initialized. This prevents being able to trace functions before
device_initcall().

There's no reason that the tracers need to be initialized so late in the
boot process. Move them up to core_initcall() as they still need to come
after early_initcall() which initializes the tracing buffers.

Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

6f415672

tracing: Replace strict_strto* with kstrto* · bcd83ea6

Daniel Walter authored Sep 26, 2012

 * remove old string conversions with kstrto*

Link: http://lkml.kernel.org/r/20120926200838.GC1244@0x90.atSigned-off-by: Daniel Walter <sahne@0x90.at>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

bcd83ea6

30 Oct, 2012 2 commits

perf/x86: Fix sparse warnings · 95d18aa2

Peter Huewe authored Oct 29, 2012

FYI, there are new sparse warnings:

 arch/x86/kernel/cpu/perf_event.c:1356:18: sparse: symbol 'events_attr' was not declared. Should it be static?

This patch makes it static and also adds the static keyword to
fix arch/x86/kernel/cpu/perf_event.c:1344:9: warning: symbol
'events_sysfs_show' was not declared.
Signed-off-by: Peter Huewe <peterhuewe@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Cc: fengguang.wu@intel.com
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lkml.kernel.org/n/tip-lerdpXlnruh0yvWs2owwuizl@git.kernel.orgSigned-off-by: Ingo Molnar <mingo@kernel.org>

95d18aa2

Merge tag 'perf-core-for-mingo' of... · 8748dd9b

Ingo Molnar authored Oct 30, 2012

Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements, fixes and code move from Arnaldo Carvalho de Melo:

 * Initialize 'page_size' variable in the python binding, this was sent
   for perf/urgent by mistake, then when merging Ingo removed it, fixing
   the problem for perf/urgent, but when perf/urgent was merged with
   perf/core, where that initialization is needed, made the python
   binding mmap call to fail, fix it by initializing page_size again.

 * Add a browser for 'perf script' and make it available from the report
   and annotate browsers. It does filtering to find the scripts that
   handle events found in the perf.data file used. From Feng Tang

 * Move some functions from symbol.c to more appropriate files, creating
   dso.[ch] in the process, no code changes. From Jiri Olsa

 * Fix mmap error output message for when perf_mmap fails and returns
   !-EPERM, where the default for mmap_pages, INT_MAX, was causing a
   !power of 2 error message, fix from Jiri Olsa.
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

8748dd9b

29 Oct, 2012 13 commits

perf python: Initialize 'page_size' variable · 0da2e9c2

Arnaldo Carvalho de Melo authored Oct 16, 2012

The commit 0c1fe6b2:

 'perf tools: Have the page size value available for all tools'

Broke the python binding because the global variable 'page_size' is
initialized on the main() routine, that is not called when using
just the python binding, causing evlist.mmap() to fail because it
expects that variable to be initialized to the system's page size.

Fix it by initializing it on the binding init routine.
Reported-by: David Ahern <dsahern@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-vrvp3azmbfzexnpmkhmvtzzc@git.kernel.orgSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

0da2e9c2

perf record: Fix mmap error output condition · 0089fa98

Jiri Olsa authored Oct 20, 2012

The mmap_pages default value is not power of 2 (UINT_MAX).

Together with perf_evlist__mmap function returning error value different
from EPERM, we get misleading error message: "--mmap_pages/-m value must
be a power of two."

Fixing this by adding extra check for UINT_MAX value for this error
condition.
Signed-off-by: Jiri Olsa <jolsa@redhat.com>
Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1350743599-4805-12-git-send-email-jolsa@redhat.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>