提交 26ae4f44 编写于 作者: A Alexander Shishkin 提交者: Ingo Molnar

perf/ring_buffer: Fix AUX software double buffering

This recent commit:

  5768402f ("perf/ring_buffer: Use high order allocations for AUX buffers optimistically")

overlooked the fact that the previous one page granularity of the AUX buffer
provided an implicit double buffering capability to the PMU driver, which
went away when the entire buffer became one high-order page.

Always make the full-trace mode AUX allocation at least two-part to preserve
the previous behavior and allow the implicit double buffering to continue.
Reported-by: NAmmy Yi <ammy.yi@intel.com>
Signed-off-by: NAlexander Shishkin <alexander.shishkin@linux.intel.com>
Acked-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Stephane Eranian <eranian@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: adrian.hunter@intel.com
Fixes: 5768402f ("perf/ring_buffer: Use high order allocations for AUX buffers optimistically")
Link: http://lkml.kernel.org/r/20190503085536.24119-2-alexander.shishkin@linux.intel.comSigned-off-by: NIngo Molnar <mingo@kernel.org>
上级 221856b1
...@@ -610,8 +610,7 @@ int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event, ...@@ -610,8 +610,7 @@ int rb_alloc_aux(struct ring_buffer *rb, struct perf_event *event,
* PMU requests more than one contiguous chunks of memory * PMU requests more than one contiguous chunks of memory
* for SW double buffering * for SW double buffering
*/ */
if ((event->pmu->capabilities & PERF_PMU_CAP_AUX_SW_DOUBLEBUF) && if (!overwrite) {
!overwrite) {
if (!max_order) if (!max_order)
return -EINVAL; return -EINVAL;
......
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