Peter Zijlstra 5322ea58a0 perf/ring-buffer: Use regular variables for nesting ...

While the IRQ/NMI will nest, the nest-count will be invariant over the
actual exception, since it will decrement equal to increment.

This means we can -- carefully -- use a regular variable since the
typical LOAD-STORE race doesn't exist (similar to preempt_count).

This optimizes the ring-buffer for all LOAD-STORE architectures, since
they need to use atomic ops to implement local_t.

Suggested-by: Alexander Shishkin <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: Arnaldo Carvalho de Melo <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Linus Torvalds <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Thomas Gleixner <[email protected]>
Cc: Vince Weaver <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>

2019-05-24 09:00:11 +02:00

..

callchain.c

perf/core: Convert to SPDX license identifiers

2019-02-04 08:46:11 +01:00

core.c

perf/core: Add perf_pmu_resched() as global function

2019-04-16 12:19:34 +02:00

hw_breakpoint.c

perf/hw_breakpoints: Convert to SPDX license identifier

2019-02-04 08:46:13 +01:00

internal.h

perf/ring-buffer: Use regular variables for nesting

2019-05-24 09:00:11 +02:00

Makefile

License cleanup: add SPDX GPL-2.0 license identifier to files with no license

2017-11-02 11:10:55 +01:00

ring_buffer.c

perf/ring-buffer: Use regular variables for nesting

2019-05-24 09:00:11 +02:00

uprobes.c

mm/mmu_notifier: use correct mmu_notifier events for each invalidation

2019-05-14 09:47:49 -07:00