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perf list: Fix documentation of :ppp

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Correctly document what is implemented for :ppp on Intel CPUs in recent
kernels.

Signed-off-by: Andi Kleen <[email protected]>
Acked-by: Jiri Olsa <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
This commit is contained in:
Andi Kleen 2016-03-21 08:56:33 -07:00 • committed by Arnaldo Carvalho de Melo
commit 4ca0d8193f
1 changed files with 4 additions and 2 deletions
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6
tools/perf/Documentation/perf-list.txt
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@ -40,10 +40,12 @@ address should be. The 'p' modifier can be specified multiple times:
0 - SAMPLE_IP can have arbitrary skid
1 - SAMPLE_IP must have constant skid
2 - SAMPLE_IP requested to have 0 skid
3 - SAMPLE_IP must have 0 skid
3 - SAMPLE_IP must have 0 skid, or uses randomization to avoid
sample shadowing effects.
For Intel systems precise event sampling is implemented with PEBS
which supports up to precise-level 2.
which supports up to precise-level 2, and precise level 3 for
some special cases
On AMD systems it is implemented using IBS (up to precise-level 2).
The precise modifier works with event types 0x76 (cpu-cycles, CPU