archives/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-03-08 05:44:45 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions

Fix a regression in the deferrable dl_server code that can cause the

Browse source 
dl_server to be stuck.
 
 Signed-off-by: Ingo Molnar <mingo@kernel.org>
 -----BEGIN PGP SIGNATURE-----
 
 iQJFBAABCgAvFiEEBpT5eoXrXCwVQwEKEnMQ0APhK1gFAml/FIkRHG1pbmdvQGtl
 cm5lbC5vcmcACgkQEnMQ0APhK1jB7w/9GazyDrZhdmJp7NeJCEW82FGKljBuEBvP
 RxN9lrhRuOIKEVuOfJI76Chd5iooSlKdDmaOcxFrkihwJ/AREHekTlYFLtncg5Zu
 5JjeYLiuN04kkOClDz7mTgcSzJD7yM0m2mD5CS45lZ35shM64eLr5GtXaFTEs9SZ
 E9R4cBiNpz4bVMNW4y3TphSlEx84sIRWoj5Gmzw3CG/52GbIcj1rgwO4b/RI4FYV
 yio7V5+ol6oVijlul/UIMYkB6vWGbO8swa/YErhyCvXpHfR1pwsEDFcTjJvO9hCK
 2QPwBo34m9mibybvQoyS+/Cybf/yWqeyc1KHqn2+wlO/Ectk97H3eBsbLO2ot/dX
 Sv+y+vq3Wm5BczaKtyCeGvk+N5NSp3jhKUO4jH0Iivi+jRJ2yynJ+Dgg0F0ldIMM
 0qBfEvaiN8Fbg8LLDevfqtGnctvRiwzKNstaZyUmq1g5NXPOGlerVtHP+osuPb/L
 lIK7uSZMZNStJS7R7vcO+g2lAl15UwBmMPEepDdUsBilnKEnefl+j5wilhjLoNM7
 G+XMSFLMoWX1/oY9f8TRs6ncZ+ays6tal8bePVyTrdp/RBAXCFlB9npNjqlTkZjT
 M6zRqHcIOPZxEJP3ZqsGb0rT41v7gJbuHg2uUSQwyqEWmTB45IqTewi2Omw/duJ/
 OOp7g2matLY=
 =U5Zw
 -----END PGP SIGNATURE-----

Merge tag 'sched-urgent-2026-02-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull scheduler fix from Ingo Molnar:
 "Fix a regression in the deferrable dl_server code that can cause the
  dl_server to be stuck"

* tag 'sched-urgent-2026-02-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/deadline: Fix 'stuck' dl_server
This commit is contained in:
Linus Torvalds 2026-02-01 10:39:52 -08:00
commit e53ada651a
1 changed files with 12 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

12
kernel/sched/deadline.c
View file

@ -1034,6 +1034,12 @@ static void update_dl_entity(struct sched_dl_entity *dl_se)
return;
}
/*
* When [4] D->A is followed by [1] A->B, dl_defer_running
* needs to be cleared, otherwise it will fail to properly
* start the zero-laxity timer.
*/
dl_se->dl_defer_running = 0;
replenish_dl_new_period(dl_se, rq);
} else if (dl_server(dl_se) && dl_se->dl_defer) {
/*
@ -1655,6 +1661,12 @@ void dl_server_update(struct sched_dl_entity *dl_se, s64 delta_exec)
* dl_server_active = 1;
* enqueue_dl_entity()
* update_dl_entity(WAKEUP)
* if (dl_time_before() || dl_entity_overflow())
* dl_defer_running = 0;
* replenish_dl_new_period();
* // fwd period
* dl_throttled = 1;
* dl_defer_armed = 1;
* if (!dl_defer_running)
* dl_defer_armed = 1;
* dl_throttled = 1;