linux-kernel - [PATCH 0/4] perf trace fixes

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Message-Id: <1386211302-31303-1-git-send-email-dsahern@gmail.com>
Date:	Wed,  4 Dec 2013 19:41:38 -0700
From:	David Ahern <dsahern@...il.com>
To:	acme@...stprotocols.net, linux-kernel@...r.kernel.org
Cc:	David Ahern <dsahern@...il.com>
Subject: [PATCH 0/4] perf trace fixes

Hi Arnaldo:

As I mentioned on IRC perf-trace fails on older kernels -- like RHEL6. This
set of patches makes it at least usable - though still some problems I am
hoping you can fix.

Build perf with these patches and run:

  perf trace -- dd if=/dev/zero of=/tmp/zero bs=4096 count=16

you see something like this which is just wrong:

  3.684 ( 0.007 ms): write(buf: 2, count: 140737077958816  ) = 27

there is no fd (should be 1 for the write) and all the values are wrong.
Perhaps it is an artifact of the older way of doing system call tracing, but
I see something goofy with the 3.12 kernel as well:
  5.633 ( 0.004 ms): write(fd: 2, buf: 0x7fff9177fee0, count: 24 ) = 24

According to strace that should be a return of 4096.

David Ahern (4):
  perf trace: Add support for syscalls vs raw_syscalls
  perf trace: Fix crash on RHEL6
  perf trace: Fix summary percentage when processing files
  perf trace: Add option to specify machine type

 tools/perf/builtin-trace.c | 48 ++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 44 insertions(+), 4 deletions(-)

-- 
1.8.3.4 (Apple Git-47)

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