linux-kernel - Re: [PATCH 3/5] cifsd: add file operations

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Message-ID: <20210322135718.GA28451@lst.de>
Date:   Mon, 22 Mar 2021 14:57:18 +0100
From:   Christoph Hellwig <hch@....de>
To:     Sergey Senozhatsky <senozhatsky@...omium.org>
Cc:     Matthew Wilcox <willy@...radead.org>,
        Namjae Jeon <namjae.jeon@...sung.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-cifs@...r.kernel.org,
        linux-cifsd-devel@...ts.sourceforge.net, smfrench@...il.com,
        hyc.lee@...il.com, viro@...iv.linux.org.uk, hch@....de,
        hch@...radead.org, ronniesahlberg@...il.com,
        aurelien.aptel@...il.com, aaptel@...e.com, sandeen@...deen.net,
        dan.carpenter@...cle.com, colin.king@...onical.com,
        rdunlap@...radead.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steve French <stfrench@...rosoft.com>
Subject: Re: [PATCH 3/5] cifsd: add file operations

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.

Do we have any data suggesting it is faster than vmalloc?