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

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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: Michal Hocko <mhocko@suse.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Acked-by: Mel Gorman <mgorman@suse.de>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko
2017-02-22 15:44:21 -08:00
committed by Linus Torvalds
parent 9d998b4f1e
commit 1265e3a69f
2 changed files with 13 additions and 8 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/trace/events/vmscan.h
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@@ -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)
);