perf: Support high-order allocations for AUX space
authorAlexander Shishkin <alexander.shishkin@linux.intel.com>
Wed, 14 Jan 2015 12:18:12 +0000 (14:18 +0200)
committerIngo Molnar <mingo@kernel.org>
Thu, 2 Apr 2015 15:14:08 +0000 (17:14 +0200)
commit0a4e38e64f5e91ce131cc42ee5bb3925377ec840
tree726e06adcb05c8e44e93ad072fdcba6be38450e3
parent45bfb2e50471abbbfd83d40d28c986078b0d24ff
perf: Support high-order allocations for AUX space

Some pmus (such as BTS or Intel PT without multiple-entry ToPA capability)
don't support scatter-gather and will prefer larger contiguous areas for
their output regions.

This patch adds a new pmu capability to request higher order allocations.

Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Kaixu Xia <kaixu.xia@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Robert Richter <rric@kernel.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@infradead.org
Cc: adrian.hunter@intel.com
Cc: kan.liang@intel.com
Cc: markus.t.metzger@intel.com
Cc: mathieu.poirier@linaro.org
Link: http://lkml.kernel.org/r/1421237903-181015-4-git-send-email-alexander.shishkin@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
include/linux/perf_event.h
kernel/events/ring_buffer.c