Messages in this thread Patch in this message | | | From | Shunsuke Nakamura <> | Subject | [PATCH v2 1/2] libperf: Add processing to scale the counters obtained during the read() system call when multiplexing | Date | Wed, 22 Sep 2021 19:16:26 +0900 |
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From: nakamura shunsuke <nakamura.shun@fujitsu.com>
perf_evsel__read() scales counters obtained by RDPMC during multiplexing, but does not scale counters obtained by read() system call.
Add processing to perf_evsel__read() to scale the counters obtained during the read() system call when multiplexing.
Signed-off-by: Shunsuke Nakamura <nakamura.shun@fujitsu.com> --- tools/lib/perf/evsel.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c index 8441e3e1aaac..0ebd1d34436f 100644 --- a/tools/lib/perf/evsel.c +++ b/tools/lib/perf/evsel.c @@ -18,6 +18,7 @@ #include <sys/ioctl.h> #include <sys/mman.h> #include <asm/bug.h> +#include <linux/math64.h> void perf_evsel__init(struct perf_evsel *evsel, struct perf_event_attr *attr, int idx) @@ -321,6 +322,11 @@ int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread, if (readn(*fd, count->values, size) <= 0) return -errno; + if (count->ena != count->run) { + if (count->run != 0) + count->val = mul_u64_u64_div64(count->val, count->ena, count->run); + } + return 0; } -- 2.27.0
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