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authorArnaldo Carvalho de Melo <[email protected]>2013-11-06 16:35:57 -0300
committerArnaldo Carvalho de Melo <[email protected]>2013-11-07 10:40:47 -0300
commit77170988ff67fb959602ab4df296ae676f556a59 (patch)
tree8e817e2d881e54cdeada21d1444b704d1a49bfcf /tools/perf/util/trace-event-scripting.c
parenta614d01bdd0cc8200d917da25f5a3d539b944193 (diff)
perf trace: Don't relookup fields by name in each sample
Instead do the lookups just when creating the tracepoints, initially for the most common, raw_syscalls:sys_{enter,exit}. It works by having evsel->priv have a per tracepoint structure with entries for the fields, for direct access, with the offset and a function to get the value from the sample, doing the swap if needed. Using a simple workload that does M millions write syscalls, we go from: # perf stat -i -e cycles /tmp/oldperf trace ./sc_hello 100 > /dev/null Performance counter stats for '/tmp/oldperf trace ./sc_hello 100': 8,366,771,459 cycles 2.668025928 seconds time elapsed # perf stat -i -e cycles perf trace ./sc_hello 100 > /dev/null Performance counter stats for 'perf trace ./sc_hello 100': 8,345,187,650 cycles 2.631748425 seconds time elapsed Cc: Adrian Hunter <[email protected]> Cc: David Ahern <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Mike Galbraith <[email protected]> Cc: Paul Mackerras <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Stephane Eranian <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
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