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authorMel Gorman <mgorman@techsingularity.net>2021-11-05 13:42:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2021-11-06 13:30:40 -0700
commitd818fca1cac31b1fc9301bda83e195a46fb4ebaa (patch)
treee904d09e6036741d123455499ce8fc5bc85d90ab /include
parent8cd7c588decf470bf7e14f2be93b709f839a965e (diff)
mm/vmscan: throttle reclaim and compaction when too may pages are isolated
Page reclaim throttles on congestion if too many parallel reclaim instances have isolated too many pages. This makes no sense, excessive parallelisation has nothing to do with writeback or congestion. This patch creates an additional workqueue to sleep on when too many pages are isolated. The throttled tasks are woken when the number of isolated pages is reduced or a timeout occurs. There may be some false positive wakeups for GFP_NOIO/GFP_NOFS callers but the tasks will throttle again if necessary. [shy828301@gmail.com: Wake up from compaction context] [vbabka@suse.cz: Account number of throttled tasks only for writeback] Link: https://lkml.kernel.org/r/20211022144651.19914-3-mgorman@techsingularity.net Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: "Darrick J . Wong" <djwong@kernel.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Matthew Wilcox <willy@infradead.org> Cc: Michal Hocko <mhocko@suse.com> Cc: NeilBrown <neilb@suse.de> Cc: Rik van Riel <riel@surriel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h1
-rw-r--r--include/trace/events/vmscan.h4
2 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 5a5e19b90dab..312c1ea9aafa 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -275,6 +275,7 @@ enum lru_list {
enum vmscan_throttle_state {
VMSCAN_THROTTLE_WRITEBACK,
+ VMSCAN_THROTTLE_ISOLATED,
NR_VMSCAN_THROTTLE,
};
diff --git a/include/trace/events/vmscan.h b/include/trace/events/vmscan.h
index c317f9fe0d17..d4905bd9e9c4 100644
--- a/include/trace/events/vmscan.h
+++ b/include/trace/events/vmscan.h
@@ -28,10 +28,12 @@
) : "RECLAIM_WB_NONE"
#define _VMSCAN_THROTTLE_WRITEBACK (1 << VMSCAN_THROTTLE_WRITEBACK)
+#define _VMSCAN_THROTTLE_ISOLATED (1 << VMSCAN_THROTTLE_ISOLATED)
#define show_throttle_flags(flags) \
(flags) ? __print_flags(flags, "|", \
- {_VMSCAN_THROTTLE_WRITEBACK, "VMSCAN_THROTTLE_WRITEBACK"} \
+ {_VMSCAN_THROTTLE_WRITEBACK, "VMSCAN_THROTTLE_WRITEBACK"}, \
+ {_VMSCAN_THROTTLE_ISOLATED, "VMSCAN_THROTTLE_ISOLATED"} \
) : "VMSCAN_THROTTLE_NONE"