From: willy@linux.intel.com (Matthew Wilcox)
Subject: [PATCH] NVMe: Reduce divide operations
Date: Fri, 21 Nov 2014 12:14:04 -0500 [thread overview]
Message-ID: <20141121171404.GR11522@wil.cx> (raw)
In-Reply-To: <alpine.LNX.2.00.1411211542000.4225@localhost.lm.intel.com>
On Fri, Nov 21, 2014@03:52:08PM +0000, Keith Busch wrote:
> On Fri, 21 Nov 2014, Matthew Wilcox wrote:
> >We could further optimise it by knowing that we need 0 pages if the I/O
> >is <= 8k in size:
>
> I think that'll break if the first page has a non-zero offset, so
> we'd have to allow the overestimate if we want to keep this function
> simple. We could micro-optimize to return 0 if it's <= 4k, though.
Yes, sorry, you're right.
next prev parent reply other threads:[~2014-11-21 17:14 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-20 22:13 [PATCH] NVMe: Reduce divide operations Sam Bradshaw
2014-11-20 23:41 ` Keith Busch
2014-11-21 17:36 ` Sam Bradshaw (sbradshaw)
2014-11-21 13:50 ` Matthew Wilcox
2014-11-21 15:52 ` Keith Busch
2014-11-21 17:14 ` Matthew Wilcox [this message]
2014-11-21 17:38 ` Sam Bradshaw (sbradshaw)
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