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  1. 20 May, 2010 3 commits
    • Frederic Weisbecker's avatar
      perf: Fix unaligned accesses while fetching trace values · 85cb68b2
      Frederic Weisbecker authored 
      Accessing trace values of an 8 size may end up in a segfault
on archs that can't deal with misaligned access, which is the
case for sparc 64. This is because PERF_SAMPLE_RAW are aligned
to 4 and not to 8.

Fix this on the macros that get the values of 8 size.

This fixes segfaults on perf tools in sparc 64.
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Tom Zanussi <tzanussi@gmail.com>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: David Miller <davem@davemloft.net>
      85cb68b2
    • Frederic Weisbecker's avatar
      perf: Comply with new rcu checks API · 49f135ed
      Frederic Weisbecker authored 
      The software events hlist doesn't fully comply with the new
rcu checks api.

We need to consider three different sides that access the hlist:

- the hlist allocation/release side. This side happens when an
  events is created or released, accesses to the hlist are
  serialized under the cpuctx mutex.

- the events insertion/removal in the hlist. This side is always
  serialized against the above one. The hlist is always present
  during such operations. This side happens when a software event
  is scheduled in/out. The serialization that ensures the software
  event is really attached to the context is made under the
  ctx->lock.

- events triggering. This is the read side, it can happen
  concurrently with any update side.

This patch deals with them one by one and anticipates with the
separate rcu mem space patches in preparation.

This patch fixes various annoying rcu warnings.
Reported-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
      49f135ed
    • Tom Zanussi's avatar
      perf: Use read() instead of lseek() in trace_event_read.c:skip() · cbb5cf7f
      Tom Zanussi authored 
      This is a small fix for a problem affecting live-mode, introduced
recently:

root@tropicana:~# perf trace rwtop
perf trace started with Perl
script /root/libexec/perf-core/scripts/perl/rwtop.pl

  Fatal: did not read header event

commit d00a47cc added a skip()
function to skip over e.g. header_page, but this doesn't work for
live mode.  This patch re-implements skip() to use read() instead of
lseek() to fix that.
Signed-off-by: default avatarTom Zanussi <tzanussi@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1273032130.6383.28.camel@tropicana>
Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      cbb5cf7f
  3. 18 May, 2010 23 commits
  5. 17 May, 2010 14 commits
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