diff options
| author | Stefan Roesch <shr@devkernel.io> | 2023-12-19 00:10:53 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-12-29 20:58:27 +0100 |
| commit | 5088b49730afaaf3134d42705cfcff7ce8be082e (patch) | |
| tree | e974b3ab381f332a503c70ca68e0602d4f6f6853 /include | |
| parent | mm/ksm: add sysfs knobs for advisor (diff) | |
| download | linux-5088b49730afaaf3134d42705cfcff7ce8be082e.tar.xz linux-5088b49730afaaf3134d42705cfcff7ce8be082e.zip | |
mm/ksm: add tracepoint for ksm advisor
This adds a new tracepoint for the ksm advisor. It reports the last scan
time, the new setting of the pages_to_scan parameter and the average cpu
percent usage of the ksmd background thread for the last scan.
Link: https://lkml.kernel.org/r/20231218231054.1625219-4-shr@devkernel.io
Signed-off-by: Stefan Roesch <shr@devkernel.io>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Rik van Riel <riel@surriel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/trace/events/ksm.h | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/include/trace/events/ksm.h b/include/trace/events/ksm.h index b5ac35c1d0e8..e728647b5d26 100644 --- a/include/trace/events/ksm.h +++ b/include/trace/events/ksm.h @@ -245,6 +245,39 @@ TRACE_EVENT(ksm_remove_rmap_item, __entry->pfn, __entry->rmap_item, __entry->mm) ); +/** + * ksm_advisor - called after the advisor has run + * + * @scan_time: scan time in seconds + * @pages_to_scan: new pages_to_scan value + * @cpu_percent: cpu usage in percent + * + * Allows to trace the ksm advisor. + */ +TRACE_EVENT(ksm_advisor, + + TP_PROTO(s64 scan_time, unsigned long pages_to_scan, + unsigned int cpu_percent), + + TP_ARGS(scan_time, pages_to_scan, cpu_percent), + + TP_STRUCT__entry( + __field(s64, scan_time) + __field(unsigned long, pages_to_scan) + __field(unsigned int, cpu_percent) + ), + + TP_fast_assign( + __entry->scan_time = scan_time; + __entry->pages_to_scan = pages_to_scan; + __entry->cpu_percent = cpu_percent; + ), + + TP_printk("ksm scan time %lld pages_to_scan %lu cpu percent %u", + __entry->scan_time, __entry->pages_to_scan, + __entry->cpu_percent) +); + #endif /* _TRACE_KSM_H */ /* This part must be outside protection */ |