Peter Zijlstra f73e22ab45 perf: Fix races in computing the header sizes ...

There are two races with the current code:

 - Another event can join the group and compute a larger header_size
   concurrently, if the smaller store wins we'll have an incorrect
   header_size set.

 - We compute the header_size after the event becomes active,
   therefore its possible to use the size before its computed.

Remedy the first by moving the computation inside the ctx::mutex lock,
and the second by placing it _before_ perf_install_in_context().

Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: [email protected]
Signed-off-by: Ingo Molnar <[email protected]>

2015-09-18 09:20:26 +02:00

..

callchain.c

Merge branch 'for-3.18-consistent-ops' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

2014-10-15 07:48:18 +02:00

core.c

perf: Fix races in computing the header sizes

2015-09-18 09:20:26 +02:00

hw_breakpoint.c

perf: Remove type specific target pointers

2015-03-23 10:58:04 +01:00

internal.h

perf: Fix AUX buffer refcounting

2015-07-06 14:08:30 +02:00

Makefile

ftrace: allow architectures to specify ftrace compile options

2015-01-29 09:19:19 +01:00

ring_buffer.c

perf/ring-buffer: Clarify the use of page::private for high-order AUX allocations

2015-08-12 11:43:20 +02:00

uprobes.c

uprobes: Fix the waitqueue_active() check in xol_free_insn_slot()

2015-07-31 10:38:07 +02:00