From: Kent Overstreet <koverstreet@google.com>
To: Zach Brown <zab@redhat.com>
Cc: linux-bcache@vger.kernel.org, linux-kernel@vger.kernel.org,
dm-devel@redhat.com, tytso@mit.edu
Subject: Re: [PATCH 4/5] aio: vmap ringbuffer
Date: Tue, 9 Oct 2012 18:09:03 -0700 [thread overview]
Message-ID: <20121010010903.GC24174@moria.home.lan> (raw)
In-Reply-To: <20121010003626.GY26187@lenny.home.zabbo.net>
On Tue, Oct 09, 2012 at 05:36:26PM -0700, Zach Brown wrote:
> > The only situation you have to worry about is when the ringbuffer fills
> > up and stuff goes on the list, and then completions completely stop -
> > this should be a rare enough situation that maybe we could just hack
> > around it with a timer that gets flipped on when the list isn't empty.
>
> Right. And this is when we hopefully realize that we're adding overhead
> and complexity (how long's the timer? always fire it? MAKE IT STOP)
> and are actually making the system worse, not better.
Can still prototype it, and if it's that ugly... I throw away code all
the time :P
> > Also, for this to be an issue at all, _all_ the reaping would have to be
> > done from userspace - since existing libaio doesn't do that, there may
> > not be any code out there which triggers it.
>
> And there may be. We default to not breaking interfaces. Seriously.
All the more reason to think about it now so we don't screw up the next
interfaces :)
next prev parent reply other threads:[~2012-10-10 1:09 UTC|newest]
Thread overview: 35+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-09 6:39 [PATCH 1/5] aio: Kill return value of aio_complete() Kent Overstreet
2012-10-09 6:39 ` [PATCH 2/5] aio: kiocb_cancel() Kent Overstreet
2012-10-09 18:26 ` Zach Brown
2012-10-09 21:37 ` Kent Overstreet
2012-10-10 11:03 ` Theodore Ts'o
2012-10-10 21:20 ` Zach Brown
2012-10-10 23:21 ` Theodore Ts'o
2012-10-11 2:41 ` Kent Overstreet
2012-10-09 6:39 ` [PATCH 3/5] aio: Rewrite refcounting Kent Overstreet
2012-10-09 18:27 ` Zach Brown
2012-10-09 22:21 ` Kent Overstreet
2012-10-09 22:35 ` Zach Brown
2012-10-10 0:17 ` Kent Overstreet
2012-10-09 6:39 ` [PATCH 4/5] aio: vmap ringbuffer Kent Overstreet
2012-10-09 18:29 ` Zach Brown
2012-10-09 21:31 ` Kent Overstreet
2012-10-09 22:32 ` Zach Brown
2012-10-09 22:44 ` Kent Overstreet
2012-10-09 22:58 ` Zach Brown
2012-10-10 0:16 ` Kent Overstreet
2012-10-10 0:36 ` Zach Brown
2012-10-10 1:09 ` Kent Overstreet [this message]
2012-10-09 6:39 ` [PATCH 5/5] aio: Refactor aio_read_evt, use cmxchg(), fix bug Kent Overstreet
2012-10-09 18:37 ` Zach Brown
2012-10-09 21:27 ` Kent Overstreet
2012-10-09 22:47 ` Zach Brown
2012-10-09 22:55 ` Kent Overstreet
2012-10-09 23:10 ` Zach Brown
2012-10-10 0:06 ` Kent Overstreet
2012-10-10 0:26 ` Zach Brown
2012-10-10 0:47 ` Kent Overstreet
2012-10-10 21:43 ` Zach Brown
2012-10-11 2:51 ` Kent Overstreet
2012-10-11 16:43 ` Zach Brown
2012-10-09 18:25 ` [PATCH 1/5] aio: Kill return value of aio_complete() Zach Brown
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