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From: "Emilio G. Cota" <cota@braap.org>
To: "Alex Bennée" <alex.bennee@linaro.org>
Cc: mttcg@listserver.greensocs.com, qemu-devel@nongnu.org,
	fred.konrad@greensocs.com, a.rigo@virtualopensystems.com,
	serge.fdrv@gmail.com, bobby.prani@gmail.com, rth@twiddle.net,
	mark.burton@greensocs.com, pbonzini@redhat.com,
	jan.kiszka@siemens.com, peter.maydell@linaro.org,
	claudio.fontana@huawei.com
Subject: Re: [Qemu-devel] [PATCH v2 0/6] Reduce lock contention on TCG hot-path
Date: Thu, 7 Jul 2016 12:04:39 -0400	[thread overview]
Message-ID: <20160707160439.GA28053@flamenco> (raw)
In-Reply-To: <1467735496-16256-1-git-send-email-alex.bennee@linaro.org>

On Tue, Jul 05, 2016 at 17:18:10 +0100, Alex Bennée wrote:
> Well this is the first re-spin of the series posted last week. I've
> added a bunch of additional patches to be more aggressive with
> avoiding bouncing locks but to be honest the numbers don't seem to
> make it worth it.

How many threads are you using? With just a few threads I wouldn't
expect a measurable difference.

> I think the first 3 patches are ready to take if the TCG maintainers
> want to:
> 
>     tcg: Ensure safe tb_jmp_cache lookup out of 'tb_lock'
>     tcg: set up tb->page_addr before insertion
>     tcg: cpu-exec: remove tb_lock from the hot-path

I think it would be simpler to use tb_lock_recursive and
tb_lock_reset, as pointed out in v1 of this series.

Thanks,

		Emilio

  parent reply	other threads:[~2016-07-07 16:05 UTC|newest]

Thread overview: 41+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-07-05 16:18 [Qemu-devel] [PATCH v2 0/6] Reduce lock contention on TCG hot-path Alex Bennée
2016-07-05 16:18 ` [Qemu-devel] [PATCH v2 1/6] tcg: Ensure safe tb_jmp_cache lookup out of 'tb_lock' Alex Bennée
2016-07-07 13:52   ` Sergey Fedorov
2016-07-08 14:51   ` Sergey Fedorov
2016-07-05 16:18 ` [Qemu-devel] [PATCH v2 2/6] tcg: set up tb->page_addr before insertion Alex Bennée
2016-07-07 14:08   ` Sergey Fedorov
2016-07-08  9:40     ` Sergey Fedorov
2016-07-05 16:18 ` [Qemu-devel] [PATCH v2 3/6] tcg: cpu-exec: remove tb_lock from the hot-path Alex Bennée
2016-07-07 14:18   ` Sergey Fedorov
2016-07-08 15:50     ` Sergey Fedorov
2016-07-08 17:34     ` Sergey Fedorov
2016-07-08 18:03       ` Alex Bennée
2016-07-08 18:20         ` Sergey Fedorov
2016-07-08 20:09   ` Sergey Fedorov
2016-07-05 16:18 ` [Qemu-devel] [PATCH v2 4/6] tcg: cpu-exec: factor out TB patching code Alex Bennée
2016-07-05 16:18 ` [Qemu-devel] [PATCH v2 5/6] tcg: introduce tb_lock_recursive() Alex Bennée
2016-07-05 16:18 ` [Qemu-devel] [PATCH v2 6/6] tcg: cpu-exec: roll-up tb_find_fast/slow Alex Bennée
2016-07-07 16:44   ` Sergey Fedorov
2016-07-07 16:44     ` [Qemu-devel] [PATCH 1/3] tcg: Introduce mmap_lock_reset() Sergey Fedorov
2016-07-07 16:44     ` [Qemu-devel] [PATCH 2/3] tcg: Introduce tb_lock_locked() Sergey Fedorov
2016-07-07 16:44     ` [Qemu-devel] [PATCH 3/3] tcg: Avoid bouncing tb_lock between tb_gen_code() and tb_add_jump() Sergey Fedorov
2016-07-07 19:36       ` Alex Bennée
2016-07-07 19:46         ` Sergey Fedorov
2016-07-07 20:36           ` Sergey Fedorov
2016-07-07 21:40             ` Alex Bennée
2016-07-08  8:40       ` Paolo Bonzini
2016-07-08 10:25         ` Sergey Fedorov
2016-07-08 11:02           ` Paolo Bonzini
2016-07-08 12:32             ` Sergey Fedorov
2016-07-08 14:07               ` Paolo Bonzini
2016-07-08 19:55                 ` Sergey Fedorov
2016-07-08 20:18                   ` Paolo Bonzini
2016-07-08 20:24                     ` Sergey Fedorov
2016-07-08 20:52                       ` Paolo Bonzini
2016-07-11 13:06                         ` Sergey Fedorov
2016-07-11 14:03                           ` Paolo Bonzini
2016-07-11 14:27                             ` Sergey Fedorov
2016-07-07 16:04 ` Emilio G. Cota [this message]
2016-07-07 16:13   ` [Qemu-devel] [PATCH v2 0/6] Reduce lock contention on TCG hot-path Paolo Bonzini
2016-07-07 19:33     ` Alex Bennée
2016-07-07 19:38   ` Alex Bennée

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