linux-kernel - Re: memfill

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Message-ID: <27995.1486460404@warthog.procyon.org.uk>
Date:   Tue, 07 Feb 2017 09:40:04 +0000
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     dhowells@...hat.com, Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
        sergey.senozhatsky@...il.com, iamjoonsoo.kim@....com,
        ngupta@...are.org, zhouxianrong@...wei.com, zhouxiyu@...wei.com,
        weidu.du@...wei.com, zhangshiming5@...wei.com,
        Mi.Sophia.Wang@...wei.com, won.ho.park@...wei.com
Subject: Re: memfill

Matthew Wilcox <willy@...radead.org> wrote:

> [adding linux-arch to see if anyone there wants to do an optimised
> version of memfill for their CPU]

For mn10300, this is superfluous since the memset() implementation will do
optimised filling of up to 8 x 4 bytes per loop if the alignments suit.

This is also superfluous for frv as that will do up to 8 x 8 bytes per loop.

So on both those arches, memfill() should probably just wrap memset().

David