From: Paolo Bonzini <pbonzini@redhat.com>
To: "Frederic Konrad" <fred.konrad@greensocs.com>,
"Alex Bennée" <alex.bennee@linaro.org>
Cc: mttcg@greensocs.com, a.rigo@virtualopensystems.com,
mark.burton@greensocs.com, guillaume.delbergue@greensocs.com,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [RFC PATCH V7 09/19] Drop global lock during TCG code execution
Date: Wed, 12 Aug 2015 11:58:45 +0200 [thread overview]
Message-ID: <55CB18D5.2020709@redhat.com> (raw)
In-Reply-To: <55CA6A6E.9030205@greensocs.com>
On 11/08/2015 23:34, Frederic Konrad wrote:
>>>
>> Also if qemu_cond_broadcast(&qemu_io_proceeded_cond) is being dropped
>> there is no point keeping the guff around in qemu_tcg_wait_io_event.
>>
> Yes good point.
>
> BTW this leads to high consumption of host CPU eg: 100% per VCPU thread as
> the VCPUs thread are no longer waiting for qemu_io_proceeded_cond.
If the guest CPU is busy waiting, that's expected. But if the guest CPU
is halted, it should not have 100% host CPU consumption.
Paolo
next prev parent reply other threads:[~2015-08-12 9:58 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-10 15:26 [Qemu-devel] [RFC PATCH V7 00/19] Multithread TCG fred.konrad
2015-08-10 15:26 ` [Qemu-devel] [RFC PATCH V7 01/19] cpus: protect queued_work_* with work_mutex fred.konrad
2015-08-10 15:59 ` Paolo Bonzini
2015-08-10 16:04 ` Frederic Konrad
2015-08-10 16:06 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 02/19] cpus: add tcg_exec_flag fred.konrad
2015-08-11 10:53 ` Paolo Bonzini
2015-08-11 11:11 ` Frederic Konrad
2015-08-11 12:57 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 03/19] cpus: introduce async_run_safe_work_on_cpu fred.konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 04/19] replace spinlock by QemuMutex fred.konrad
2015-08-10 16:09 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 05/19] remove unused spinlock fred.konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 06/19] add support for spin lock on POSIX systems exclusively fred.konrad
2015-08-10 16:10 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 07/19] protect TBContext with tb_lock fred.konrad
2015-08-10 16:36 ` Paolo Bonzini
2015-08-10 16:50 ` Paolo Bonzini
2015-08-10 18:39 ` Alex Bennée
2015-08-11 8:31 ` Paolo Bonzini
2015-08-11 6:46 ` Frederic Konrad
2015-08-11 8:34 ` Paolo Bonzini
2015-08-11 9:21 ` Peter Maydell
2015-08-11 9:59 ` Paolo Bonzini
2015-08-12 17:45 ` Frederic Konrad
2015-08-12 18:20 ` Alex Bennée
2015-08-12 18:22 ` Paolo Bonzini
2015-08-14 8:38 ` Frederic Konrad
2015-08-15 0:04 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 08/19] tcg: remove tcg_halt_cond global variable fred.konrad
2015-08-10 16:12 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 09/19] Drop global lock during TCG code execution fred.konrad
2015-08-10 16:15 ` Paolo Bonzini
2015-08-11 6:55 ` Frederic Konrad
2015-08-11 20:12 ` Alex Bennée
2015-08-11 21:34 ` Frederic Konrad
2015-08-12 9:58 ` Paolo Bonzini [this message]
2015-08-12 12:32 ` Frederic Konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 10/19] cpu: remove exit_request global fred.konrad
2015-08-10 15:51 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 11/19] tcg: switch on multithread fred.konrad
2015-08-13 11:17 ` Paolo Bonzini
2015-08-13 14:41 ` Frederic Konrad
2015-08-13 14:58 ` Paolo Bonzini
2015-08-13 15:18 ` Frederic Konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 12/19] Use atomic cmpxchg to atomically check the exclusive value in a STREX fred.konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 13/19] add a callback when tb_invalidate is called fred.konrad
2015-08-10 16:52 ` Paolo Bonzini
2015-08-10 18:41 ` Alex Bennée
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 14/19] cpu: introduce tlb_flush*_all fred.konrad
2015-08-10 15:54 ` Paolo Bonzini
2015-08-10 16:00 ` Peter Maydell
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 15/19] arm: use tlb_flush*_all fred.konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 16/19] translate-all: introduces tb_flush_safe fred.konrad
2015-08-10 16:26 ` Paolo Bonzini
2015-08-12 14:09 ` Paolo Bonzini
2015-08-12 14:11 ` Frederic Konrad
2015-08-12 14:14 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 17/19] translate-all: (wip) use tb_flush_safe when we can't alloc more tb fred.konrad
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 18/19] mttcg: signal the associated cpu anyway fred.konrad
2015-08-10 15:51 ` Paolo Bonzini
2015-08-10 15:27 ` [Qemu-devel] [RFC PATCH V7 19/19] target-arm/psci.c: wake up sleeping CPUs (MTTCG) fred.konrad
2015-08-10 16:41 ` Paolo Bonzini
2015-08-10 18:38 ` Alex Bennée
2015-08-10 18:34 ` [Qemu-devel] [RFC PATCH V7 00/19] Multithread TCG Alex Bennée
2015-08-10 23:02 ` Frederic Konrad
2015-08-11 6:15 ` Benjamin Herrenschmidt
2015-08-11 6:27 ` Frederic Konrad
2015-10-07 12:46 ` Claudio Fontana
2015-10-07 14:52 ` Frederic Konrad
2015-10-21 15:09 ` Claudio Fontana
2015-08-11 7:54 ` Alex Bennée
2015-08-11 9:22 ` Benjamin Herrenschmidt
2015-08-11 9:29 ` Peter Maydell
2015-08-11 10:09 ` Benjamin Herrenschmidt
2015-08-11 19:22 ` Alex Bennée
2015-08-11 12:45 ` Paolo Bonzini
2015-08-11 13:59 ` Frederic Konrad
2015-08-11 14:10 ` Paolo Bonzini
2015-08-12 15:19 ` Frederic Konrad
2015-08-12 15:39 ` Paolo Bonzini
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=55CB18D5.2020709@redhat.com \
--to=pbonzini@redhat.com \
--cc=a.rigo@virtualopensystems.com \
--cc=alex.bennee@linaro.org \
--cc=fred.konrad@greensocs.com \
--cc=guillaume.delbergue@greensocs.com \
--cc=mark.burton@greensocs.com \
--cc=mttcg@greensocs.com \
--cc=qemu-devel@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.