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authorBaolin Wang <baolin.wang@linux.alibaba.com>2023-05-25 15:54:00 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-06-10 02:25:43 +0300
commit447ba88658faa8dbfd29d557daa38b7d88f460ec (patch)
tree7fd79bfd55176801ce5f106d4fda5361206e7913 /mm/compaction.c
parent8b71b499ff98fdcda7efefc146841a8b4d26813d (diff)
downloadlinux-447ba88658faa8dbfd29d557daa38b7d88f460ec.tar.xz
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>
Diffstat (limited to 'mm/compaction.c')
-rw-r--r--mm/compaction.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/mm/compaction.c b/mm/compaction.c
index 3b09d8d02581..ce6293bf9c4a 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -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) {