From: Matthew Wilcox <willy@infradead.org>
To: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Namjae Jeon <namjae.jeon@samsung.com>,
linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-cifs@vger.kernel.org,
linux-cifsd-devel@lists.sourceforge.net,
Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
linux-mm@vger.kernel.org, Uladzislau Rezki <urezki@gmail.com>
Subject: Re: [PATCH 3/5] cifsd: add file operations
Date: Mon, 22 Mar 2021 13:02:42 +0000 [thread overview]
Message-ID: <20210322130242.GL1719932@casper.infradead.org> (raw)
In-Reply-To: <YFhdWeedjQQgJdbi@google.com>
On Mon, Mar 22, 2021 at 06:03:21PM +0900, Sergey Senozhatsky wrote:
> On (21/03/22 08:15), Matthew Wilcox wrote:
> >
> > What's the scenario for which your allocator performs better than slub
> >
>
> IIRC request and reply buffers can be up to 4M in size. So this stuff
> just allocates a number of fat buffers and keeps them around so that
> it doesn't have to vmalloc(4M) for every request and every response.
That makes a lot more sense; I was thrown off by the kvmalloc, which
is usually used for allocations that might be smaller than PAGE_SIZE.
So what this patch is really saying is that vmalloc() should include
some caching, so it can defer freeing until there's memory pressure
or it's built up a large (percpu) backlog of freed areas.
Vlad, have you thought about this?
next prev parent reply other threads:[~2021-03-22 13:16 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20210322052203epcas1p21fe2d04c4df5396c466c38f4d57d8bb8@epcas1p2.samsung.com>
2021-03-22 5:13 ` [PATCH 0/5] cifsd: introduce new SMB3 kernel server Namjae Jeon
[not found] ` <CGME20210322052204epcas1p1382cadbfe958d156c0ad9f7fcb8532b7@epcas1p1.samsung.com>
2021-03-22 5:13 ` [PATCH 1/5] cifsd: add server handler and tranport layers Namjae Jeon
2021-03-22 22:18 ` Matthew Wilcox
2021-03-23 3:01 ` Namjae Jeon
2021-03-23 3:12 ` Matthew Wilcox
2021-03-23 3:16 ` Namjae Jeon
[not found] ` <CGME20210322052206epcas1p438f15851216f07540537c5547a0a2c02@epcas1p4.samsung.com>
2021-03-22 5:13 ` [PATCH 2/5] cifsd: add server-side procedures for SMB3 Namjae Jeon
2021-03-22 6:47 ` Dan Carpenter
2021-03-22 6:50 ` Christoph Hellwig
2021-03-22 13:25 ` [Linux-cifsd-devel] " Stefan Metzmacher
2021-03-22 23:20 ` Namjae Jeon
2021-03-22 23:17 ` Namjae Jeon
2021-03-23 7:19 ` Dan Carpenter
2021-03-25 5:25 ` Sebastian Gottschall
2021-03-22 8:34 ` Matthew Wilcox
2021-03-22 10:27 ` Sergey Senozhatsky
2021-03-22 13:12 ` Matthew Wilcox
[not found] ` <CGME20210322052207epcas1p3f0a5bdfd2c994a849a67b465479d0721@epcas1p3.samsung.com>
2021-03-22 5:13 ` [PATCH 3/5] cifsd: add file operations Namjae Jeon
2021-03-22 6:55 ` Al Viro
2021-03-23 0:12 ` Namjae Jeon
2021-03-22 7:02 ` Al Viro
2021-03-22 9:26 ` Sergey Senozhatsky
2021-03-22 7:04 ` Dan Carpenter
2021-03-22 9:39 ` Sergey Senozhatsky
2021-03-22 8:15 ` Matthew Wilcox
2021-03-22 9:03 ` Sergey Senozhatsky
2021-03-22 13:02 ` Matthew Wilcox [this message]
2021-03-22 13:57 ` Christoph Hellwig
2021-03-22 14:40 ` Matthew Wilcox
2021-03-22 17:09 ` Matthew Wilcox
2021-03-23 0:05 ` Sergey Senozhatsky
2021-03-22 16:16 ` Schaufler, Casey
2021-03-23 0:21 ` Namjae Jeon
[not found] ` <CGME20210322052208epcas1p430b2e93761d5194844c533c61d43242d@epcas1p4.samsung.com>
2021-03-22 5:13 ` [PATCH 4/5] cifsd: add Kconfig and Makefile Namjae Jeon
[not found] ` <CGME20210322052209epcas1p377f1542bcc9ec50219d2e57aa92d944b@epcas1p3.samsung.com>
2021-03-22 5:13 ` [PATCH 5/5] MAINTAINERS: add cifsd kernel server Namjae Jeon
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