From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: ming.lei@canonical.com, pl@kamp.de, stefanha@redhat.com
Subject: Re: [Qemu-devel] [PATCH 5/7] coroutine: rewrite pool to avoid mutex
Date: Fri, 28 Nov 2014 18:30:50 +0100 [thread overview]
Message-ID: <5478B14A.1060002@redhat.com> (raw)
In-Reply-To: <20141128164023.GH4035@noname.redhat.com>
On 28/11/2014 17:40, Kevin Wolf wrote:
>> > I still believe we will end with some kind of coroutine bypass scheme
>> > (even coroutines _do_ allocate an AIOCB, so calling bdrv_aio_readv
>> > directly can help), but hey it cannot hurt to optimize hot code.
>
> Not sure if speculations about the future belong into commit messages,
> but while it may turn out that a bypass is required in the end (I hope
> it doesn't), the part about AIOCBs is wrong if you really consistently
> use coroutines all the way down from the device to the block driver.
This is much harder from virtio-scsi than from virtio-blk, though.
Paolo
next prev parent reply other threads:[~2014-11-28 17:31 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-11-28 14:12 [Qemu-devel] [PATCH 0/7] coroutine: optimizations Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 1/7] coroutine-ucontext: use __thread Paolo Bonzini
2014-11-28 14:28 ` Peter Maydell
2014-11-28 14:45 ` Markus Armbruster
2014-11-28 15:36 ` Kevin Wolf
2014-11-28 14:12 ` [Qemu-devel] [PATCH 2/7] qemu-thread: add per-thread atexit functions Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 3/7] test-coroutine: avoid overflow on 32-bit systems Paolo Bonzini
2014-12-01 1:28 ` Ming Lei
2014-12-01 12:41 ` Paolo Bonzini
2014-12-02 1:20 ` Ming Lei
2014-11-28 14:12 ` [Qemu-devel] [PATCH 4/7] QSLIST: add lock-free operations Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 5/7] coroutine: rewrite pool to avoid mutex Paolo Bonzini
2014-11-28 16:40 ` Kevin Wolf
2014-11-28 17:30 ` Paolo Bonzini [this message]
2014-11-28 17:31 ` Paolo Bonzini
2014-11-28 18:34 ` Kevin Wolf
2014-11-28 19:57 ` Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 6/7] coroutine: drop qemu_coroutine_adjust_pool_size Paolo Bonzini
2014-11-28 14:12 ` [Qemu-devel] [PATCH 7/7] coroutine: try harder not to delete coroutines Paolo Bonzini
2014-11-28 20:52 ` Peter Lieven
2014-11-29 14:27 ` Paolo Bonzini
2014-11-29 21:28 ` Peter Lieven
2014-11-29 14:28 ` Paolo Bonzini
2014-12-01 5:55 ` [Qemu-devel] [PATCH 0/7] coroutine: optimizations Ming Lei
2014-12-01 7:05 ` Peter Lieven
2014-12-01 7:46 ` Ming Lei
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