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mm/ksm: add tracepoint for ksm advisor

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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>
This commit is contained in:
Stefan Roesch 2023-12-18 15:10:53 -08:00 committed by Andrew Morton
parent 66790e9a73
commit 5088b49730
2 changed files with 34 additions and 0 deletions
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33
include/trace/events/ksm.h
View File

@ -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 */

1
mm/ksm.c
View File

@ -458,6 +458,7 @@ static void scan_time_advisor(void)
advisor_ctx.cpu_time = cpu_time;
ksm_thread_pages_to_scan = pages;
trace_ksm_advisor(scan_time, pages, cpu_percent);
}
static void advisor_stop_scan(void)