From: Christoph Hellwig <hch@infradead.org>
To: Sergey Senozhatsky <sergey.senozhatsky.work@gmail.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/2] mm/shrinker: make unregister_shrinker() less fragile
Date: Tue, 14 Jul 2015 00:17:59 -0700 [thread overview]
Message-ID: <20150714071759.GD31117@infradead.org> (raw)
In-Reply-To: <20150713092531.GA578@swordfish>
On Mon, Jul 13, 2015 at 06:34:42PM +0900, Sergey Senozhatsky wrote:
> Yes. 'Nice' used in a sense that drivers have logic to release the
> memory anyway; mm asks volunteers (the drivers that have registered
> shrinker callbacks) to release some spare/wasted/etc. when things
> are getting tough (the drivers are not aware of that in general).
> This is surely important to mm, not to the driver though -- it just
> agrees to be 'nice', but even not expected to release any memory at
> all (IOW, this is not a contract).
Not registering the shrinker is a plain and simple memory leak. Just
like a missing free your driver will appear to work fine for a while,
but eventually the leaks will bring down the whole system including
your driver.
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
prev parent reply other threads:[~2015-07-14 7:18 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-11 2:51 Sergey Senozhatsky
2015-07-11 2:51 ` [PATCH 1/2] mm/shrinker: do not NULL dereference uninitialized shrinker Sergey Senozhatsky
2015-07-11 2:51 ` [PATCH 2/2] mm/shrinker: add init_shrinker() function Sergey Senozhatsky
2015-07-11 10:02 ` [PATCH 0/2] mm/shrinker: make unregister_shrinker() less fragile Christoph Hellwig
2015-07-12 2:47 ` Sergey Senozhatsky
2015-07-13 6:33 ` Christoph Hellwig
2015-07-13 6:52 ` Sergey Senozhatsky
2015-07-13 9:03 ` Christoph Hellwig
2015-07-13 9:34 ` Sergey Senozhatsky
2015-07-14 7:17 ` Christoph Hellwig [this message]
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=20150714071759.GD31117@infradead.org \
--to=hch@infradead.org \
--cc=akpm@linux-foundation.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=sergey.senozhatsky.work@gmail.com \
--cc=sergey.senozhatsky@gmail.com \
/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