Yang Yang 662ce1dc9c delayacct: track delays from write-protect copy ... Delay accounting does not track the delay of write-protect copy. When tasks trigger many write-protect copys(include COW and unsharing of anonymous pages[1]), it may spend a amount of time waiting for them. To get the delay of tasks in write-protect copy, could help users to evaluate the impact of using KSM or fork() or GUP. Also update tools/accounting/getdelays.c: / # ./getdelays -dl -p 231 print delayacct stats ON listen forever PID 231 CPU count real total virtual total delay total delay average 6247 1859000000 2154070021 1674255063 0.268ms IO count delay total delay average 0 0 0ms SWAP count delay total delay average 0 0 0ms RECLAIM count delay total delay average 0 0 0ms THRASHING count delay total delay average 0 0 0ms COMPACT count delay total delay average 3 72758 0ms WPCOPY count delay total delay average 3635 271567604 0ms [1] commit 31cc5bc4af70("mm: support GUP-triggered unsharing of anonymous pages") Link: https://lkml.kernel.org/r/20220409014342.2505532-1-yang.yang29@zte.com.cn Signed-off-by: Yang Yang <yang.yang29@zte.com.cn> Reviewed-by: David Hildenbrand <david@redhat.com> Reviewed-by: Jiang Xuexin <jiang.xuexin@zte.com.cn> Reviewed-by: Ran Xiaokai <ran.xiaokai@zte.com.cn> Reviewed-by: wangyong <wang.yong12@zte.com.cn> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Mike Kravetz <mike.kravetz@oracle.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>		2022-06-01 15:55:25 -07:00
..
cgroupstats.rst	Documentation: Replace lkml.org links with lore	2021-01-11 12:47:38 -07:00
delay-accounting.rst	delayacct: track delays from write-protect copy	2022-06-01 15:55:25 -07:00
index.rst	docs: add some documentation dirs to the driver-api book	2019-07-15 11:03:02 -03:00
psi.rst	sched/psi: report zeroes for CPU full at the system level	2022-04-22 12:14:08 +02:00
taskstats-struct.rst	docs: accounting: convert to ReST	2019-07-15 09:20:25 -03:00
taskstats.rst	docs: accounting: convert to ReST	2019-07-15 09:20:25 -03:00