From: Oleksandr Natalenko <oleksandr@natalenko.name>
To: timofey.titovets@synesis.ru
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-mm@kvack.org, nefelim4ag@gmail.com, willy@infradead.org
Subject: Re: [PATCH V3] KSM: allow dedup all tasks memory
Date: Tue, 13 Nov 2018 12:06:03 +0100 [thread overview]
Message-ID: <b4c41073d763dc5798562233de8eaa6d@natalenko.name> (raw)
In-Reply-To: <<20181112231344.7161-1-timofey.titovets@synesis.ru>>
Hi.
> ksm by default working only on memory that added by
> madvise().
>
> And only way get that work on other applications:
> * Use LD_PRELOAD and libraries
> * Patch kernel
>
> Lets use kernel task list and add logic to import VMAs from tasks.
>
> That behaviour controlled by new attributes:
> * mode:
> I try mimic hugepages attribute, so mode have two states:
> * madvise - old default behaviour
> * always [new] - allow ksm to get tasks vma and
> try working on that.
> * seeker_sleep_millisecs:
> Add pauses between imports tasks VMA
>
> For rate limiting proporses and tasklist locking time,
> ksm seeker thread only import VMAs from one task per loop.
>
> Some numbers from different not madvised workloads.
> Formulas:
> Percentage ratio = (pages_sharing - pages_shared)/pages_unshared
> Memory saved = (pages_sharing - pages_shared)*4/1024 MiB
> Memory used = free -h
>
> * Name: My working laptop
> Description: Many different chrome/electron apps + KDE
> Ratio: 5%
> Saved: ~100 MiB
> Used: ~2000 MiB
>
> * Name: K8s test VM
> Description: Some small random running docker images
> Ratio: 40%
> Saved: ~160 MiB
> Used: ~920 MiB
>
> * Name: Ceph test VM
> Description: Ceph Mon/OSD, some containers
> Ratio: 20%
> Saved: ~60 MiB
> Used: ~600 MiB
>
> * Name: BareMetal K8s backend server
> Description: Different server apps in containers C, Java, GO & etc
> Ratio: 72%
> Saved: ~5800 MiB
> Used: ~35.7 GiB
>
> * Name: BareMetal K8s processing server
> Description: Many instance of one CPU intensive application
> Ratio: 55%
> Saved: ~2600 MiB
> Used: ~28.0 GiB
>
> * Name: BareMetal Ceph node
> Description: Only OSD storage daemons running
> Raio: 2%
> Saved: ~190 MiB
> Used: ~11.7 GiB
Out of curiosity, have you compared these results with UKSM [1]?
Thanks.
--
Oleksandr Natalenko (post-factum)
[1] https://github.com/dolohow/uksm
next parent reply other threads:[~2018-11-13 11:06 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <<20181112231344.7161-1-timofey.titovets@synesis.ru>
2018-11-13 11:06 ` Oleksandr Natalenko [this message]
2018-11-13 11:56 ` [PATCH V3] KSM: allow dedup all tasks memory Timofey Titovets
2018-11-13 16:33 ` Oleksandr Natalenko
2018-11-13 17:10 ` Timofey Titovets
2018-11-13 17:27 ` Oleksandr Natalenko
2018-11-13 17:44 ` Timofey Titovets
2018-11-13 18:20 Timofey Titovets
[not found] <<CAG48ez0ZprqUYGZFxcrY6U3Dnwt77q1NJXzzpsn1XNkRuXVppw@mail.gmail.com>
2018-11-13 14:23 ` Oleksandr Natalenko
2018-11-13 17:59 ` Pavel Tatashin
2018-11-13 18:17 ` Timofey Titovets
2018-11-13 18:35 ` Pavel Tatashin
2018-11-13 18:54 ` Timofey Titovets
2018-11-13 19:16 ` Pavel Tatashin
2018-11-13 22:40 ` Timofey Titovets
2018-11-13 22:53 ` Pavel Tatashin
2018-11-13 23:07 ` Timofey Titovets
2018-11-13 20:26 ` Jann Horn
2018-11-13 22:35 ` Pavel Tatashin
-- strict thread matches above, loose matches on Subject: below --
2018-11-12 23:13 Timofey Titovets
2018-11-13 1:49 ` Matthew Wilcox
2018-11-13 11:25 ` Timofey Titovets
2018-11-13 2:25 ` Pavel Tatashin
2018-11-13 11:40 ` Timofey Titovets
2018-11-13 18:42 ` Pavel Tatashin
2018-11-13 22:55 ` Timofey Titovets
2018-11-13 11:57 ` Jann Horn
2018-11-13 12:58 ` Timofey Titovets
2018-11-13 13:25 ` Jann Horn
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