linux-toradex.git/tools, branch v2.6.32.35

perf: Initialize callchains roots's childen hits

2010-09-20T20:17:55+00:00

commit 5225c45899e872383ca39f5533d28ec63c54b39e upstream.

Each histogram entry has a callchain root that stores the
callchain samples. However we forgot to initialize the
tracking of children hits of these roots, which then got
random values on their creation.

The root children hits is multiplied by the minimum percentage
of hits provided by the user, and the result becomes the minimum
hits expected from children branches. If the random value due
to the uninitialization is big enough, then this minimum number
of hits can be huge and eventually filter every children branches.

The end result was invisible callchains. All we need to
fix this is to initialize the children hits of the root.

Reported-by: Christoph Hellwig 
Signed-off-by: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Peter Zijlstra 
Cc: Arnaldo Carvalho de Melo 
Cc: Paul Mackerras 
Signed-off-by: Greg Kroah-Hartman

perf: Resurrect flat callchains

2010-08-02T17:20:51+00:00

commit 97aa1052739c6a06cb6b0467dbf410613d20bc97 upstream.

Initialize the callchain radix tree root correctly.

When we walk through the parents, we must stop after the root, but
since it wasn't well initialized, its parent pointer was random.

Also the number of hits was random because uninitialized, hence it
was part of the callchain while the root doesn't contain anything.

This fixes segfaults and percentages followed by empty callchains
while running:

	perf report -g flat

Reported-by: Ingo Molnar 
Signed-off-by: Frederic Weisbecker 
Cc: Peter Zijlstra 
Cc: Arnaldo Carvalho de Melo 
Cc: Paul Mackerras 
Signed-off-by: Greg Kroah-Hartman

perf: Make the install relative to DESTDIR if specified

2010-04-01T22:58:24+00:00

commit 7ae5f21361fea11f58c398701da635f778635d13 upstream.

Without this change, the install path is relative to
prefix/DESTDIR where prefix is automatically set to $HOME.

This can produce unexpected results. For example:

  make -C tools/perf DESTDIR=/home/jkacur/tmp install-man

creates the directory:		/home/jkacur/home/jkacur/tmp/share/...
instead of the expected:	/home/jkacur/tmp/share/...

Signed-off-by: John Kacur 
Cc: Peter Zijlstra 
Cc: Paul Mackerras 
Cc: Arnaldo Carvalho de Melo 
Cc: Frederic Weisbecker 
Cc: Tom Zanussi 
Cc: Kyle McMartin 
LKML-Reference: <1268312220-12880-1-git-send-email-jkacur@redhat.com>
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

perf timechart: Use tid not pid for COMM change

2010-01-25T18:49:44+00:00

commit 8f06d7e6e1bbfb32698d6d455583ab7460c090e2 upstream.

A process that changes its comm field, does this on a per kernel
task struct basis. The timechart tool used, incorrectly, the pid
to track this, and should have used the tid instead...

Signed-off-by: Arjan van de Ven 
Cc: Peter Zijlstra 
Cc: Mike Galbraith 
Cc: Paul Mackerras 
Cc: Arnaldo Carvalho de Melo 
Cc: Frederic Weisbecker 
LKML-Reference: <20100116125319.34ac3edd@infradead.org>
Signed-off-by: Ingo Molnar 
Signed-off-by: Greg Kroah-Hartman

perf tools: Fix permission checks

2009-11-08T16:04:54+00:00

The perf_event_open() system call returns EACCES if the user is
not root which results in a very confusing error message:

  $ perf record -A -a -f

    Error: perfcounter syscall returned with -1 (Permission denied)

    Fatal: No CONFIG_PERF_EVENTS=y kernel support configured?

It turns out that's because perf tools are checking only for
EPERM. Fix that up to get a much better error message:

  $ perf record -A -a -f
    Fatal: Permission error - are you root?

Signed-off-by: Pekka Enberg 
Cc: Peter Zijlstra 
Cc: Paul Mackerras 
Cc: Frederic Weisbecker 
LKML-Reference: <1257696066-4046-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar

perf tools: Remove -Wcast-align

2009-10-26T08:43:06+00:00

The present use of -Wcast-align causes the build to blow up on
SH due to generating a "cast increases required alignment of
target type" error on each invocation of list_for_each_entry().

It seems that this was previously reported and killed off in the
ia64 support patch, but nothing seems to have happened with
that. Presumably the same problem still remains there, too.

Signed-off-by: Paul Mundt 
LKML-Reference: <20091026054000.GA13517@linux-sh.org>
Signed-off-by: Ingo Molnar

perf tools: Fix compatibility with libelf 0.8 and autodetect

2009-10-25T16:09:14+00:00

The Makefile now automatically defines LIBELF_NO_MMAP when
libelf 0.8.x is detected. libelf 0.8 is still maintained and
some distributions such as Arch Linux use it instead of
elfutils.

Signed-off-by: Marti Raudsepp 
Cc: Lucas De Marchi 
Cc: Peter Zijlstra 
Cc: Paul Mackerras 
Cc: Frederic Weisbecker 
Cc: Arnaldo Carvalho de Melo 
Cc: Arjan van de Ven 
Cc: Mike Galbraith 
LKML-Reference: <1256400636.3007.16.camel@newn>
Signed-off-by: Ingo Molnar

perf timechart: Improve the visual appearance of scheduler delays

2009-10-20T01:39:21+00:00

[from KS feedback]

Currently, scheduler delays are shown in a mostly transparent,
light yellow color. This color is rather hard to see on several
screens, especially projectors.

This patch changes the color of the scheduler delays to be a
much more "hard" yellow that survived the kernel summit
projector.

Reported-by: Linus Torvalds 
Signed-off-by: Arjan van de Ven 
Cc: Mike Galbraith 
Cc: Paul Mackerras 
Cc: Arnaldo Carvalho de Melo 
Cc: Frederic Weisbecker 
LKML-Reference: <20091020064731.20ae126a@infradead.org>
Signed-off-by: Ingo Molnar

perf timechart: Fix the wakeup-arrows that point to non-visible processes

2009-10-20T01:39:16+00:00

The timechart wakeup arrows currently show no process
information when the waker/wakee are processes that are not
actually chosen to be shown on the timechart.

This patch fixes this oversight, by looking through all
processes (after giving preference to visible processes) as well
as falling back to just showing the PID if no name for the
process can be resolved.

Signed-off-by: Arjan van de Ven 
Cc: Peter Zijlstra 
Cc: Mike Galbraith 
Cc: Paul Mackerras 
Cc: Arnaldo Carvalho de Melo 
Cc: Frederic Weisbecker 
LKML-Reference: <20091020064649.0e4959b2@infradead.org>
Signed-off-by: Ingo Molnar

perf top: Fix --delay_secs 0 division by zero

2009-10-19T07:52:39+00:00

Add delay_secs sanity check to handle_keypress,
this fixes a division by zero crash.

Signed-off-by: Tim Blechmann 
Cc: Peter Zijlstra 
Cc: Paul Mackerras 
Cc: Mike Galbraith 
Cc: Arnaldo Carvalho de Melo 
Cc: Frederic Weisbecker 
LKML-Reference: <4AD9EBFD.106@klingt.org>
Signed-off-by: Ingo Molnar