From: Raghavendra K T <raghavendra.kt@amd.com>
To: Mel Gorman <mgorman@techsingularity.net>,
Peter Zijlstra <peterz@infradead.org>
Cc: K Prateek Nayak <kprateek.nayak@amd.com>,
Bharata B Rao <bharata@amd.com>, Ingo Molnar <mingo@redhat.com>,
LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH 0/6] sched/numa: Complete scanning of partial and inactive VMAs
Date: Tue, 10 Oct 2023 17:09:28 +0530 [thread overview]
Message-ID: <793eaa1a-c836-3f0d-7443-b2165a9c6ab9@amd.com> (raw)
In-Reply-To: <20231010083143.19593-1-mgorman@techsingularity.net>
On 10/10/2023 2:01 PM, Mel Gorman wrote:
> NUMA Balancing currently uses PID fault activity within a VMA to
> determine if it is worth updating PTEs to trap NUMA hinting faults.
> While this is reduces overhead, it misses two important corner case.
> The first is that if Task A partially scans a VMA that is active and
> Task B resumes the scan but is inactive, then the remainder of the VMA
> may be missed. Similarly, if a VMA is inactive for a period of time then
> it may never be scanned again.
>
> Patches 1-3 improve the documentation of the current per-VMA tracking
> and adds a trace point for scan activity. Patch 4 addresses a corner
> case where the PID activity information may not be reset after the
> expected timeout. Patches 5-6 complete the scanning of partial and
> inactive VMAs within the scan sequence.
>
> This could be improved further but it would deserve a separate series on
> top with supporting data justifying the change. Otherwise and gain/loss
> due to the additional changes could be masked by this series on its own.
>
Thank you Mel for the patches. I see Ingo already took to sched/core.
Here is my testing detail FWIW.
SUT:
- 4th Generation EPYC System
- 2 x 128C/256T
- NPS1 mode
base: 6.6.-rc4
patch_v1r5: Mel's Initial series with prev_scan_seq = -1 fix
Link: https://git.kernel.org/pub/scm/linux/kernel/git/mel/linux.git/
sched-numabselective-v1r5
(May not be relevant. But I did see number was even more better for
thread_alloc, so ..)
patch_v1_r13: current series
numa01_thread_alloc
=============
base patch_v1r5 patch_v1r13
real 8m46.557s 8m29.040s 8m38.098s
user 599m6.070s 268m38.140s 404m52.065s
sys 3655m38.681s 3794m10.079s 3751m36.779s
numa_hit 394964680 396000482 393981391
numa_local 197351688 198242761 197008099
numa_other 197612992 197757721 196973292
numa_pte_updates 1160 790360 812
numa_hint_faults 755 729196 553
numa_hint_faults_local 754 410220 263
numa_pages_migrated 1 318976 290
num01
======
real 18m26.691s 17m31.770s 17m33.540s
user 4501m40.194s 2148m7.993s 3295m57.897s
sys 3483m11.684s 4764m57.876s 4215m35.599s
numa_hit 395473956 395813242 395000242
numa_local 197776626 198188480 197983594
numa_other 197697330 197624762 197016648
numa_pte_updates 1447 4625319 7142774
numa_hint_faults 1390 4947832 10313097
numa_hint_faults_local 1288 2758651 5354895
numa_pages_migrated 102 594803 960422
Thanks and Regards
- Raghu
next prev parent reply other threads:[~2023-10-10 11:39 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-10 8:31 [PATCH 0/6] sched/numa: Complete scanning of partial and inactive VMAs Mel Gorman
2023-10-10 8:31 ` [PATCH 1/6] sched/numa: Document vma_numab_state fields Mel Gorman
2023-10-10 8:31 ` [PATCH 2/6] sched/numa: Rename vma_numab_state.access_pids Mel Gorman
2023-10-10 8:31 ` [PATCH 3/6] sched/numa: Trace decisions related to skipping VMAs Mel Gorman
2023-10-10 8:31 ` [PATCH 4/6] sched/numa: Move up the access pid reset logic Mel Gorman
2023-10-10 8:31 ` [PATCH 5/6] sched/numa: Complete scanning of partial VMAs regardless of PID activity Mel Gorman
2023-10-10 8:31 ` [PATCH 6/6] sched/numa: Complete scanning of inactive VMAs when there is no alternative Mel Gorman
2023-10-10 9:23 ` Ingo Molnar
2023-10-10 9:57 ` Mel Gorman
2023-10-10 21:39 ` Ingo Molnar
2023-10-10 11:40 ` Raghavendra K T
2024-02-24 4:50 ` Raghavendra K T
2023-10-10 11:42 ` Raghavendra K T
2023-10-10 11:39 ` Raghavendra K T [this message]
2023-10-10 21:45 ` [PATCH 0/6] sched/numa: Complete scanning of partial and inactive VMAs Ingo Molnar
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=793eaa1a-c836-3f0d-7443-b2165a9c6ab9@amd.com \
--to=raghavendra.kt@amd.com \
--cc=bharata@amd.com \
--cc=kprateek.nayak@amd.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mgorman@techsingularity.net \
--cc=mingo@redhat.com \
--cc=peterz@infradead.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).