LKML Archive on lore.kernel.org
 help / color / Atom feed
* [PATCH v6 0/2] sched/deadline: Fix and optimize sched_dl_global_validate()
@ 2020-10-08 15:47 Peng Liu
  2020-10-08 15:48 ` [PATCH v6 1/2] sched/deadline: Optimize sched_dl_global_validate() Peng Liu
                   ` (2 more replies)
  0 siblings, 3 replies; 7+ messages in thread
From: Peng Liu @ 2020-10-08 15:47 UTC (permalink / raw)
  To: linux-kernel
  Cc: mingo, peterz, juri.lelli, vincent.guittot, dietmar.eggemann,
	rostedt, bsegall, mgorman, bristot, valentin.schneider, raistlin,
	iwtbavbm

When change global rt bandwidth, we check to make sure that new
settings could accommodate the allocated dl bandwidth.

Under SMP, the dl_bw is on a per root domain basis, currently we check
and update the new settings one cpu by one cpu, but not in the unit of
root domain, which is either overdoing or error.

patch 1 removed the superfluous checking and updating
patch 2 fixed the error validation

For details, please see the corresponding patch.

----------------
v6 <-- v5:
 - no functional changes, just revert visit_gen back to u64;

v5 <-- v4:
 - no functional changes, just split the v4 single patch to two to
   obey the "one patch do only one thing" rule;
 - turn root_domain::visit_gen from u64 to u32;
   both suggested by Juri.
 - refine changelog;

v4 <-- v3:
 - refine changelog;
 - eliminate the ugly #ifdef guys with Peter's method;

v3 <-- v2:
 - fix build error for !CONFIG_SMP, reported by kernel test robot;

v2 <-- v1:
 - replace cpumask_weight(cpu_rq(cpu)->rd->span) with dl_bw_cpus(cpu),
   suggested by Juri;

Peng Liu (2):
  sched/deadline: Optimize sched_dl_global_validate()
  sched/deadline: Fix sched_dl_global_validate()

 kernel/sched/deadline.c | 44 +++++++++++++++++++++++++++--------
 kernel/sched/sched.h    | 51 ++++++++++++++++++++++-------------------
 kernel/sched/topology.c |  1 +
 3 files changed, 63 insertions(+), 33 deletions(-)

-- 
2.20.1


^ permalink raw reply	[flat|nested] 7+ messages in thread

end of thread, back to index

Thread overview: 7+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-10-08 15:47 [PATCH v6 0/2] sched/deadline: Fix and optimize sched_dl_global_validate() Peng Liu
2020-10-08 15:48 ` [PATCH v6 1/2] sched/deadline: Optimize sched_dl_global_validate() Peng Liu
2020-10-29 10:51   ` [tip: sched/core] " tip-bot2 for Peng Liu
2020-10-08 15:49 ` [PATCH v6 2/2] sched/deadline: Fix sched_dl_global_validate() Peng Liu
2020-10-29 10:51   ` [tip: sched/core] " tip-bot2 for Peng Liu
2020-10-14 13:32 ` [PATCH v6 0/2] sched/deadline: Fix and optimize sched_dl_global_validate() Juri Lelli
2020-10-18  8:27   ` Daniel Bristot de Oliveira

LKML Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/lkml/0 lkml/git/0.git
	git clone --mirror https://lore.kernel.org/lkml/1 lkml/git/1.git
	git clone --mirror https://lore.kernel.org/lkml/2 lkml/git/2.git
	git clone --mirror https://lore.kernel.org/lkml/3 lkml/git/3.git
	git clone --mirror https://lore.kernel.org/lkml/4 lkml/git/4.git
	git clone --mirror https://lore.kernel.org/lkml/5 lkml/git/5.git
	git clone --mirror https://lore.kernel.org/lkml/6 lkml/git/6.git
	git clone --mirror https://lore.kernel.org/lkml/7 lkml/git/7.git
	git clone --mirror https://lore.kernel.org/lkml/8 lkml/git/8.git
	git clone --mirror https://lore.kernel.org/lkml/9 lkml/git/9.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 lkml lkml/ https://lore.kernel.org/lkml \
		linux-kernel@vger.kernel.org
	public-inbox-index lkml

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-kernel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git