Messages in this thread Patch in this message | | | From | Shunsuke Nakamura <> | Subject | [PATCH 1/3] libperf: Add processing to scale the counters obtained during the read() system call when multiplexing | Date | Fri, 20 Aug 2021 18:39:06 +0900 |
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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 | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/tools/lib/perf/evsel.c b/tools/lib/perf/evsel.c index d8886720e83d..005cf64a1ad7 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) @@ -308,6 +309,9 @@ int perf_evsel__read(struct perf_evsel *evsel, int cpu, int thread, if (readn(FD(evsel, cpu, thread), count->values, size) <= 0) return -errno; + if (count->ena != count->run) + count->val = mul_u64_u64_div64(count->val, count->ena, count->run); + return 0; } -- 2.25.1
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