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mm: compaction: add trace event for fast freepages isolation 

The fast_isolate_freepages() can also isolate freepages, but we can not
know the fast isolation efficiency to understand the fast isolation
pressure.  So add a trace event to show some numbers to help to understand
the efficiency for fast freepages isolation.

Link: https://lkml.kernel.org/r/78d2932d0160d122c15372aceb3f2c45460a17fc.1685018752.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@techsingularity.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Baolin Wang 2023-05-25 20:54:00 +08:00 committed by Andrew Morton
parent 8b71b499ff
commit 447ba88658
2 changed files with 16 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
include/trace/events/compaction.h
View File

@ -64,6 +64,17 @@ DEFINE_EVENT(mm_compaction_isolate_template, mm_compaction_isolate_freepages,
TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
);
DEFINE_EVENT(mm_compaction_isolate_template, mm_compaction_fast_isolate_freepages,
TP_PROTO(
unsigned long start_pfn,
unsigned long end_pfn,
unsigned long nr_scanned,
unsigned long nr_taken),
TP_ARGS(start_pfn, end_pfn, nr_scanned, nr_taken)
);
#ifdef CONFIG_COMPACTION
TRACE_EVENT(mm_compaction_migratepages,

6
mm/compaction.c
View File

@ -1416,7 +1416,7 @@ static int next_search_order(struct compact_control *cc, int order)
static void fast_isolate_freepages(struct compact_control *cc)
{
unsigned int limit = max(1U, freelist_scan_limit(cc) >> 1);
unsigned int nr_scanned = 0;
unsigned int nr_scanned = 0, total_isolated = 0;
unsigned long low_pfn, min_pfn, highest = 0;
unsigned long nr_isolated = 0;
unsigned long distance;
@ -1515,6 +1515,7 @@ static void fast_isolate_freepages(struct compact_control *cc)
set_page_private(page, order);
nr_isolated = 1 << order;
nr_scanned += nr_isolated - 1;
total_isolated += nr_isolated;
cc->nr_freepages += nr_isolated;
list_add_tail(&page->lru, &cc->freepages);
count_compact_events(COMPACTISOLATED, nr_isolated);
@ -1535,6 +1536,9 @@ static void fast_isolate_freepages(struct compact_control *cc)
limit = max(1U, limit >> 1);
}
trace_mm_compaction_fast_isolate_freepages(min_pfn, cc->free_pfn,
nr_scanned, total_isolated);
if (!page) {
cc->fast_search_fail++;
if (scan_start) {