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| author | David S. Miller <davem@davemloft.net> | 2019-12-23 02:15:05 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-12-23 02:15:05 +0300 |
| commit | ac80010fc94eb0680d9a432b639583bd7ac29066 (patch) | |
| tree | 2de924c048910abfbfff52a3d5188a790ead379f /arch/s390/kernel/perf_cpum_sf.c | |
| parent | cfeec3fb5451c2edd0569c0c245868612a417e5f (diff) | |
| parent | c60174717544aa8959683d7e19d568309c3a0c65 (diff) | |
| download | linux-ac80010fc94eb0680d9a432b639583bd7ac29066.tar.xz | |
Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
Mere overlapping changes in the conflicts here.
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/s390/kernel/perf_cpum_sf.c')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_sf.c | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index c07fdcd73726..77d93c534284 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -1303,18 +1303,28 @@ static void hw_perf_event_update(struct perf_event *event, int flush_all) */ if (flush_all && done) break; - - /* If an event overflow happened, discard samples by - * processing any remaining sample-data-blocks. - */ - if (event_overflow) - flush_all = 1; } /* Account sample overflows in the event hardware structure */ if (sampl_overflow) OVERFLOW_REG(hwc) = DIV_ROUND_UP(OVERFLOW_REG(hwc) + sampl_overflow, 1 + num_sdb); + + /* Perf_event_overflow() and perf_event_account_interrupt() limit + * the interrupt rate to an upper limit. Roughly 1000 samples per + * task tick. + * Hitting this limit results in a large number + * of throttled REF_REPORT_THROTTLE entries and the samples + * are dropped. + * Slightly increase the interval to avoid hitting this limit. + */ + if (event_overflow) { + SAMPL_RATE(hwc) += DIV_ROUND_UP(SAMPL_RATE(hwc), 10); + debug_sprintf_event(sfdbg, 1, "%s: rate adjustment %ld\n", + __func__, + DIV_ROUND_UP(SAMPL_RATE(hwc), 10)); + } + if (sampl_overflow || event_overflow) debug_sprintf_event(sfdbg, 4, "%s: " "overflows: sample %llu event %llu" |