Commit 1265e3a6 authored by Michal Hocko's avatar Michal Hocko Committed by Linus Torvalds
Browse files

mm, vmscan: show the number of skipped pages in mm_vmscan_lru_isolate 

mm_vmscan_lru_isolate shows the number of requested, scanned and taken
pages.  This is mostly OK but on 32b systems the number of scanned pages
is quite misleading because it includes both the scanned and skipped
pages.  Moreover the skipped part is scaled based on the number of taken
pages.  Let's report the exact numbers without any additional logic and
add the number of skipped pages.

This should make the reported data much more easier to interpret.

Link: http://lkml.kernel.org/r/20170104101942.4860-4-mhocko@kernel.org


Signed-off-by: default avatarMichal Hocko <mhocko@suse.com>
Acked-by: default avatarMinchan Kim <minchan@kernel.org>
Acked-by: default avatarMel Gorman <mgorman@suse.de>
Acked-by: default avatarVlastimil Babka <vbabka@suse.cz>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 9d998b4f

include/trace/events/vmscan.h

+6 −2
Original line number Diff line number Diff line
@@ -274,17 +274,19 @@ TRACE_EVENT(mm_vmscan_lru_isolate, 
		int order,

		unsigned long nr_requested,

		unsigned long nr_scanned,

		unsigned long nr_skipped,

		unsigned long nr_taken,

		isolate_mode_t isolate_mode,

		int file),



	TP_ARGS(classzone_idx, order, nr_requested, nr_scanned, nr_taken, isolate_mode, file),

	TP_ARGS(classzone_idx, order, nr_requested, nr_scanned, nr_skipped, nr_taken, isolate_mode, file),



	TP_STRUCT__entry(

		__field(int, classzone_idx)

		__field(int, order)

		__field(unsigned long, nr_requested)

		__field(unsigned long, nr_scanned)

		__field(unsigned long, nr_skipped)

		__field(unsigned long, nr_taken)

		__field(isolate_mode_t, isolate_mode)

		__field(int, file)
@@ -295,17 +297,19 @@ TRACE_EVENT(mm_vmscan_lru_isolate, 
		__entry->order = order;

		__entry->nr_requested = nr_requested;

		__entry->nr_scanned = nr_scanned;

		__entry->nr_skipped = nr_skipped;

		__entry->nr_taken = nr_taken;

		__entry->isolate_mode = isolate_mode;

		__entry->file = file;

	),



	TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_taken=%lu file=%d",

	TP_printk("isolate_mode=%d classzone=%d order=%d nr_requested=%lu nr_scanned=%lu nr_skipped=%lu nr_taken=%lu file=%d",

		__entry->isolate_mode,

		__entry->classzone_idx,

		__entry->order,

		__entry->nr_requested,

		__entry->nr_scanned,

		__entry->nr_skipped,

		__entry->nr_taken,

		__entry->file)

);

mm/vmscan.c

+7 −6
Original line number Diff line number Diff line
@@ -1437,6 +1437,7 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, 
	unsigned long nr_taken = 0;

	unsigned long nr_zone_taken[MAX_NR_ZONES] = { 0 };

	unsigned long nr_skipped[MAX_NR_ZONES] = { 0, };

	unsigned long skipped = 0, total_skipped = 0;

	unsigned long scan, nr_pages;

	LIST_HEAD(pages_skipped);
@@ -1488,14 +1489,13 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, 
	 */

	if (!list_empty(&pages_skipped)) {

		int zid;

		unsigned long total_skipped = 0;



		for (zid = 0; zid < MAX_NR_ZONES; zid++) {

			if (!nr_skipped[zid])

				continue;



			__count_zid_vm_events(PGSCAN_SKIP, zid, nr_skipped[zid]);

			total_skipped += nr_skipped[zid];

			skipped += nr_skipped[zid];

		}



		/*
@@ -1503,13 +1503,14 @@ static unsigned long isolate_lru_pages(unsigned long nr_to_scan, 
		 * close to unreclaimable. If the LRU list is empty, account

		 * skipped pages as a full scan.

		 */

		scan += list_empty(src) ? total_skipped : total_skipped >> 2;

		total_skipped = list_empty(src) ? skipped : skipped >> 2;



		list_splice(&pages_skipped, src);

	}

	*nr_scanned = scan;

	trace_mm_vmscan_lru_isolate(sc->reclaim_idx, sc->order, nr_to_scan, scan,

				    nr_taken, mode, is_file_lru(lru));

	*nr_scanned = scan + total_skipped;

	trace_mm_vmscan_lru_isolate(sc->reclaim_idx, sc->order, nr_to_scan,

				    scan, skipped, nr_taken, mode,

				    is_file_lru(lru));

	update_lru_sizes(lruvec, lru, nr_zone_taken);

	return nr_taken;

}

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