The patch titled
writeback: trace wakeup event for background writeback
has been added to the -mm tree. Its filename is
writeback-trace-wakeup-event-for-background-writeback.patch
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------------------------------------------------------
Subject: writeback: trace wakeup event for background writeback
From: Wu Fengguang <fengguang.wu@xxxxxxxxx>
This tracks when balance_dirty_pages() tries to wakeup the flusher thread
for background writeback (if it was not started already).
Suggested-by: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Dave Chinner <david@xxxxxxxxxxxxx>
Cc: Jan Engelhardt <jengelh@xxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/fs-writeback.c | 1 +
include/trace/events/writeback.h | 1 +
2 files changed, 2 insertions(+)
diff -puN fs/fs-writeback.c~writeback-trace-wakeup-event-for-background-writeback fs/fs-writeback.c
--- a/fs/fs-writeback.c~writeback-trace-wakeup-event-for-background-writeback
+++ a/fs/fs-writeback.c
@@ -169,6 +169,7 @@ void bdi_start_background_writeback(stru
* We just wake up the flusher thread. It will perform background
* writeback as soon as there is no other work to do.
*/
+ trace_writeback_wake_background(bdi);
spin_lock_bh(&bdi->wb_lock);
bdi_wakeup_flusher(bdi);
spin_unlock_bh(&bdi->wb_lock);
diff -puN include/trace/events/writeback.h~writeback-trace-wakeup-event-for-background-writeback include/trace/events/writeback.h
--- a/include/trace/events/writeback.h~writeback-trace-wakeup-event-for-background-writeback
+++ a/include/trace/events/writeback.h
@@ -81,6 +81,7 @@ DEFINE_EVENT(writeback_class, name, \
TP_ARGS(bdi))
DEFINE_WRITEBACK_EVENT(writeback_nowork);
+DEFINE_WRITEBACK_EVENT(writeback_wake_background);
DEFINE_WRITEBACK_EVENT(writeback_wake_thread);
DEFINE_WRITEBACK_EVENT(writeback_wake_forker_thread);
DEFINE_WRITEBACK_EVENT(writeback_bdi_register);
_
Patches currently in -mm which might be from fengguang.wu@xxxxxxxxx are
origin.patch
mm-smaps-export-mlock-information.patch
writeback-integrated-background-writeback-work.patch
writeback-trace-wakeup-event-for-background-writeback.patch
writeback-stop-background-kupdate-works-from-livelocking-other-works.patch
writeback-avoid-livelocking-wb_sync_all-writeback.patch
writeback-check-skipped-pages-on-wb_sync_all.patch
memcg-add-page_cgroup-flags-for-dirty-page-tracking.patch
memcg-document-cgroup-dirty-memory-interfaces.patch
memcg-document-cgroup-dirty-memory-interfaces-fix.patch
memcg-create-extensible-page-stat-update-routines.patch
memcg-add-lock-to-synchronize-page-accounting-and-migration.patch
writeback-create-dirty_info-structure.patch
memcg-add-dirty-page-accounting-infrastructure.patch
memcg-add-kernel-calls-for-memcg-dirty-page-stats.patch
memcg-add-dirty-limits-to-mem_cgroup.patch
memcg-add-dirty-limits-to-mem_cgroup-use-native-word-to-represent-dirtyable-pages.patch
memcg-add-dirty-limits-to-mem_cgroup-catch-negative-per-cpu-sums-in-dirty-info.patch
memcg-add-dirty-limits-to-mem_cgroup-avoid-overflow-in-memcg_hierarchical_free_pages.patch
memcg-add-dirty-limits-to-mem_cgroup-correct-memcg_hierarchical_free_pages-return-type.patch
memcg-add-dirty-limits-to-mem_cgroup-avoid-free-overflow-in-memcg_hierarchical_free_pages.patch
memcg-cpu-hotplug-lockdep-warning-fix.patch
memcg-add-cgroupfs-interface-to-memcg-dirty-limits.patch
memcg-break-out-event-counters-from-other-stats.patch
memcg-check-memcg-dirty-limits-in-page-writeback.patch
memcg-use-native-word-page-statistics-counters.patch
memcg-use-native-word-page-statistics-counters-fix.patch
memcg-add-mem_cgroup-parameter-to-mem_cgroup_page_stat.patch
memcg-pass-mem_cgroup-to-mem_cgroup_dirty_info.patch
memcg-make-throttle_vm_writeout-memcg-aware.patch
memcg-simplify-mem_cgroup_page_stat.patch
memcg-simplify-mem_cgroup_dirty_info.patch
memcg-make-mem_cgroup_page_stat-return-value-unsigned.patch
memcg-use-zalloc-rather-than-mallocmemset.patch
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