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  1. 16 Nov, 2009 2 commits
    • Arnaldo Carvalho de Melo's avatar
      perf symbols: Call the symbol filter in dso__synthesize_plt_symbols() · 82164161
      Arnaldo Carvalho de Melo authored 
      We need to pass the symbol to the filter so that, for instance,
'perf top' can do filtering and also set the private area it
manages, setting the ->map pointer, etc.

I found this while running 'perf top' on a machine where hits
happened on PLT symbols, where ->map wasn't being set up and
segfaults thus happened.
Signed-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1258386491-20278-1-git-send-email-acme@infradead.org>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      82164161
    • Peter Zijlstra's avatar
      perf_event: Optimize perf_output_lock() · 559fdc3c
      Peter Zijlstra authored 
      The purpose of perf_output_{un,}lock() is to:

 1) avoid publishing incomplete data
    [ possible when publishing a head that is ahead of an entry
      that is still being written ]

 2) guarantee fwd progress
    [ a simple refcount on pending writers doesn't need to drop to
      0, making it so would end up implementing something like forced
      quiecent states of RCU ]

To satisfy the above without undue complexity it serializes
between CPUs, this means that a pending writer can only be the
same cpu in a nested context, and since (under normal operation)
a cpu always makes progress we're good -- if the head is only
published when the bottom  most writer completes.

Now we don't need to disable IRQs in order to serialize between
CPUs, disabling preemption ought to be sufficient, esp since we
already deal with nesting due to NMIs.

This avoids potentially expensive (and needless) local IRQ
disable/enable ops.
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258373161.26714.254.camel@laptop>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      559fdc3c
  3. 15 Nov, 2009 4 commits
    • Lucas De Marchi's avatar
      perf stat: Do not print ratio when task-clock event is not counted · 7255fe2a
      Lucas De Marchi authored 
      The ratio between the number of events and the time elapsed makes
sense only if task-clock event is counted. Otherwise it will be
simply a (confusing)

	#      0.000 M/sec

This patch outputs the ratio only if task-clock event is counted.
Some test examples of before and after:

Before:

 [lucas@skywalker linux.trees.git]$ sudo perf stat -e branch-misses -a -- sleep 1

	 Performance counter stats for 'sleep 1':

		1367818  branch-misses            #      0.000 M/sec

	    1.001494325  seconds time elapsed

After (without task-clock):

 [lucas@skywalker perf]$ sudo ./perf stat -e branch-misses -a -- sleep 1

	 Performance counter stats for 'sleep 1':

		1135044  branch-misses

	    1.001370775  seconds time elapsed

After (with task-clock):

 [lucas@skywalker perf]$ sudo ./perf stat -e branch-misses -e task-clock -a -- sleep 1

	 Performance counter stats for 'sleep 1':

		1070111  branch-misses            #      0.534 M/sec
	    2002.730893  task-clock-msecs         #      1.999 CPUs

	    1.001640292  seconds time elapsed
Signed-off-by: default avatarLucas De Marchi <lucas.de.marchi@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091115140507.GB21561@skywalker.lan>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      7255fe2a
    • Hitoshi Mitake's avatar
      perf tools: Add new perf_atoll() function to parse string representing size in bytes · d2fb8b41
      Hitoshi Mitake authored 
      This patch modifies util/string.[ch] to add new function:
perf_atoll() to parse string representing size in bytes.

This function parses (\d+)(b|B|kb|KB|mb|MB|gb|GB) (e.g. "256MB")
and returns its numeric value. (e.g. 268435456)
Signed-off-by: default avatarHitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258285013-4759-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      d2fb8b41
    • Ingo Molnar's avatar
      Merge branches 'perf/powerpc' and 'perf/bench' into perf/core · 0ffa798d
      Ingo Molnar authored 
      Merge reason: Both 'perf bench' and the pending PowerPC changes
              are now ready for the next merge window.
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      0ffa798d
    • Ingo Molnar's avatar
      Merge commit 'v2.6.32-rc7' into perf/core · 39dc78b6
      Ingo Molnar authored 
      Merge reason: pick up perf fixlets
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      39dc78b6
  5. 14 Nov, 2009 1 commit
  7. 13 Nov, 2009 2 commits
  9. 12 Nov, 2009 31 commits