From: "Cédric Villemain" <cedric@2ndquadrant.com>
To: linux-mm@kvack.org
Cc: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: mincore() & fincore()
Date: Thu, 25 Jul 2013 17:07:10 +0200 [thread overview]
Message-ID: <201307251707.11159.cedric@2ndquadrant.com> (raw)
In-Reply-To: <201307251658.33548.cedric@2ndquadrant.com>
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[sorry, previous mail was sent earlier than expected]
> First, the proposed changes in this email are to be used at least for
> PostgreSQL extensions, maybe for core.
>
> Purpose is to offer better monitoring/tracking of the hot/cold areas (and
> read/write paterns) in the tables and indexes, in PostgreSQL those are by default
> written in segments of 1GB.
>
> There are some possible usecase already:
>
> * planning of hardware upgrade
> * easier configuration setup (both PostgreSQL and linux)
> * provide more informations to the planner/executor of PostgreSQL
>
> My ideas so far are to
>
> * improve mincore() in linux and add it information like in freeBSD (at
> least adding 'mincore_modified' to track clean vs dirty pages).
> * adding fincore() to make the information easier to grab from PostgreSQL (no
> mmap)
> * maybe some access to those stats in /proc/
>
> It makes years that libprefetch, mincore() and fincore() are discussed on linux
> mailling lists. And they got a good feedback... So I hope it is ok to keep on
> those and provide updated patches.
Johannes, I add you in CC because you're the last one who proposed something.
Can I update your patch with previous suggestions from reviewers ?
I'm also asking for feedback in this area, others ideas are very welcome.
--
Cédric Villemain +33 (0)6 20 30 22 52
http://2ndQuadrant.fr/
PostgreSQL: Support 24x7 - Développement, Expertise et Formation
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next prev parent reply other threads:[~2013-07-25 15:07 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-07-25 14:58 Cédric Villemain
2013-07-25 15:07 ` Cédric Villemain [this message]
2013-07-25 15:32 ` Johannes Weiner
2013-07-26 1:55 ` Wanpeng Li
2013-07-27 20:08 ` Cédric Villemain
2013-07-26 1:55 ` Wanpeng Li
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