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| author | Thomas Richter <tmricht@linux.ibm.com> | 2022-01-13 12:51:56 +0100 |
|---|---|---|
| committer | Heiko Carstens <hca@linux.ibm.com> | 2022-01-17 14:13:08 +0100 |
| commit | 745f5d20e7936931f924410f32d8b0e599b5990e (patch) | |
| tree | aa458f3516f9a4ccb2a6d1316e3c3f693ad1d823 /arch/s390/kernel | |
| parent | a87b0fd4f9003f8521226e226cf92b18147b3519 (diff) | |
| download | lwn-745f5d20e7936931f924410f32d8b0e599b5990e.tar.gz lwn-745f5d20e7936931f924410f32d8b0e599b5990e.zip | |
s390/cpumf: Support for CPU Measurement Sampling Facility LS bit
Adds support for the CPU Measurement Sampling Facility limit sampling
bit in the sampling device driver.
Limited samples have no valueable information are not collected.
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/perf_cpum_sf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/kernel/perf_cpum_sf.c b/arch/s390/kernel/perf_cpum_sf.c index db62def4ef28..332a49965130 100644 --- a/arch/s390/kernel/perf_cpum_sf.c +++ b/arch/s390/kernel/perf_cpum_sf.c @@ -1179,7 +1179,7 @@ static void hw_collect_samples(struct perf_event *event, unsigned long *sdbt, sample = (struct hws_basic_entry *) *sdbt; while ((unsigned long *) sample < (unsigned long *) te) { /* Check for an empty sample */ - if (!sample->def) + if (!sample->def || sample->LS) break; /* Update perf event period */ |