From: Paolo Bonzini <pbonzini@redhat.com>
To: "Emilio G. Cota" <cota@braap.org>,
Peter Maydell <peter.maydell@linaro.org>
Cc: mttcg@listserver.greensocs.com,
"Peter Crosthwaite" <crosthwaite.peter@gmail.com>,
"Mark Burton" <mark.burton@greensocs.com>,
"QEMU Developers" <qemu-devel@nongnu.org>,
"Alvise Rigo" <a.rigo@virtualopensystems.com>,
"Sergey Fedorov" <serge.fdrv@gmail.com>,
"Richard Henderson" <rth@twiddle.net>,
"Alex Bennée" <alex.bennee@linaro.org>,
"Andreas Färber" <afaerber@suse.de>,
"KONRAD Frédéric" <fred.konrad@greensocs.com>
Subject: Re: [Qemu-devel] [RFC v1 01/11] tcg: move tb_find_fast outside the tb_lock critical section
Date: Tue, 22 Mar 2016 09:29:42 +0100 [thread overview]
Message-ID: <56F10276.8090109@redhat.com> (raw)
In-Reply-To: <20160321235950.GA9356@flamenco>
On 22/03/2016 00:59, Emilio G. Cota wrote:
> Good point. Most of my tests have been on x86-on-x86, and the
> difference there (for many CPU-intensive benchmarks such as SPEC) was
> negligible.
>
> Just tested the current master booting Alex' debian ARM image, without
> LRU, and I see a 20% increase in boot time.
>
> I'll add per-bucket locks to keep the same behaviour without hurting
> scalability.
You probably should skip the MRU move if the TB is not within the first
N items of the list (e.g. N=4). Then you take the lock much less.
Paolo
next prev parent reply other threads:[~2016-03-22 8:29 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-18 16:18 [Qemu-devel] [RFC v1 00/11] Base enabling patches for MTTCG Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 01/11] tcg: move tb_find_fast outside the tb_lock critical section Alex Bennée
2016-03-18 16:54 ` Paolo Bonzini
2016-03-21 21:50 ` Emilio G. Cota
2016-03-21 22:08 ` Peter Maydell
2016-03-21 23:59 ` Emilio G. Cota
2016-03-22 8:29 ` Paolo Bonzini [this message]
2016-03-22 11:59 ` Alex Bennée
2016-03-22 11:55 ` Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 02/11] cpu-exec: elide more icount code if CONFIG_USER_ONLY Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 03/11] tcg: comment on which functions have to be called with tb_lock held Alex Bennée
2016-03-18 16:59 ` Paolo Bonzini
2016-03-21 21:50 ` Emilio G. Cota
2016-03-21 22:12 ` Paolo Bonzini
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 04/11] tcg: protect TBContext with tb_lock Alex Bennée
2016-03-18 16:18 ` [RFC v1 05/11] target-arm/psci.c: wake up sleeping CPUs Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] " Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 06/11] tcg: cpus rm tcg_exec_all() Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 07/11] tcg: add options for enabling MTTCG Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 08/11] tcg: add kick timer for single-threaded vCPU emulation Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 09/11] tcg: drop global lock during TCG code execution Alex Bennée
2016-03-18 16:49 ` Paolo Bonzini
2016-03-23 9:19 ` KONRAD Frederic
2016-03-23 16:27 ` Alex Bennée
2016-03-23 20:36 ` Jan Kiszka
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 10/11] tcg: grab iothread lock in cpu-exec interrupt handling Alex Bennée
2016-03-18 16:48 ` Paolo Bonzini
2016-03-22 12:03 ` Alex Bennée
2016-03-18 16:18 ` [Qemu-devel] [RFC v1 11/11] tcg: enable thread-per-vCPU Alex Bennée
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