WSL2-Linux-Kernel/kernel/events
Peter Zijlstra bf378d341e perf: Fix perf ring buffer memory ordering
The PPC64 people noticed a missing memory barrier and crufty old
comments in the perf ring buffer code. So update all the comments and
add the missing barrier.

When the architecture implements local_t using atomic_long_t there
will be double barriers issued; but short of introducing more
conditional barrier primitives this is the best we can do.

Reported-by: Victor Kaplansky <victork@il.ibm.com>
Tested-by: Victor Kaplansky <victork@il.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: michael@ellerman.id.au
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: anton@samba.org
Cc: benh@kernel.crashing.org
Link: http://lkml.kernel.org/r/20131025173749.GG19466@laptop.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2013-10-29 12:01:19 +01:00
..
Makefile uprobes: Move to kernel/events/ 2012-02-22 11:08:00 +01:00
callchain.c perf: Roll back callchain buffer refcount under the callchain mutex 2013-08-16 17:55:50 +02:00
core.c perf: Disable PERF_RECORD_MMAP2 support 2013-10-17 16:27:14 -03:00
hw_breakpoint.c hw_breakpoint: Introduce "struct bp_cpuinfo" 2013-06-20 17:58:57 +02:00
internal.h perf: Fix mmap() accounting hole 2013-06-19 12:44:13 +02:00
ring_buffer.c perf: Fix perf ring buffer memory ordering 2013-10-29 12:01:19 +01:00
uprobes.c uprobes: Fix utask->depth accounting in handle_trampoline() 2013-09-12 08:00:55 +02:00