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authorLinus Torvalds <torvalds@linux-foundation.org>2022-06-06 01:58:27 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2022-06-06 01:58:27 +0200
commite17fee8976c3d2ccf9add6d6c8912a37b025d840 (patch)
tree86f877aad442ee8ac003e74b4427d653c26d6878 /Documentation
parentbluetooth: don't use bitmaps for random flag accesses (diff)
parentdelayacct: track delays from write-protect copy (diff)
downloadlinux-e17fee8976c3d2ccf9add6d6c8912a37b025d840.tar.xz
linux-e17fee8976c3d2ccf9add6d6c8912a37b025d840.zip
Merge tag 'mm-nonmm-stable-2022-06-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Pull delay-accounting update from Andrew Morton: "A single featurette for delay accounting. Delayed a bit because, unusually, it had dependencies on both the mm-stable and mm-nonmm-stable queues" * tag 'mm-nonmm-stable-2022-06-05' of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm: delayacct: track delays from write-protect copy
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/accounting/delay-accounting.rst5
1 files changed, 4 insertions, 1 deletions
diff --git a/Documentation/accounting/delay-accounting.rst b/Documentation/accounting/delay-accounting.rst
index 197fe319cbec..241d1a87f2cd 100644
--- a/Documentation/accounting/delay-accounting.rst
+++ b/Documentation/accounting/delay-accounting.rst
@@ -15,6 +15,7 @@ c) swapping in pages
d) memory reclaim
e) thrashing page cache
f) direct compact
+g) write-protect copy
and makes these statistics available to userspace through
the taskstats interface.
@@ -48,7 +49,7 @@ this structure. See
for a description of the fields pertaining to delay accounting.
It will generally be in the form of counters returning the cumulative
delay seen for cpu, sync block I/O, swapin, memory reclaim, thrash page
-cache, direct compact etc.
+cache, direct compact, write-protect copy etc.
Taking the difference of two successive readings of a given
counter (say cpu_delay_total) for a task will give the delay
@@ -117,6 +118,8 @@ Get sum of delays, since system boot, for all pids with tgid 5::
0 0 0ms
COMPACT count delay total delay average
0 0 0ms
+ WPCOPY count delay total delay average
+ 0 0 0ms
Get IO accounting for pid 1, it works only with -p::