From: Juan Quintela <quintela@redhat.com>
To: Leonardo Bras Soares Passos <leobras@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>,
"Marcel Apfelbaum" <marcel.apfelbaum@gmail.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
"Peter Xu" <peterx@redhat.com>, "Eric Blake" <eblake@redhat.com>,
"Philippe Mathieu-Daudé" <f4bug@amsat.org>,
"Yanan Wang" <wangyanan55@huawei.com>,
"Markus Armbruster" <armbru@redhat.com>,
"Eduardo Habkost" <eduardo@habkost.net>
Subject: Re: [PATCH v7 06/12] multifd: Make flags field thread local
Date: Tue, 23 Aug 2022 15:00:24 +0200 [thread overview]
Message-ID: <87h723yv13.fsf@secure.mitica> (raw)
In-Reply-To: <CAJ6HWG7hXM8jwLTqTZx_uyWm0KKBC93wVgrXV_dcC_r+HwKmPw@mail.gmail.com> (Leonardo Bras Soares Passos's message of "Sat, 20 Aug 2022 04:24:54 -0300")
Leonardo Bras Soares Passos <leobras@redhat.com> wrote:
> On Fri, Aug 19, 2022 at 7:03 AM Juan Quintela <quintela@redhat.com> wrote:
>>
>> Leonardo Brás <leobras@redhat.com> wrote:
>> > On Tue, 2022-08-02 at 08:39 +0200, Juan Quintela wrote:
>> >> Use of flags with respect to locking was incensistant. For the
>> >> sending side:
>> >> - it was set to 0 with mutex held on the multifd channel.
>> >> - MULTIFD_FLAG_SYNC was set with mutex held on the migration thread.
>> >> - Everything else was done without the mutex held on the multifd channel.
>> >>
>> >> On the reception side, it is not used on the migration thread, only on
>> >> the multifd channels threads.
>> >>
>> >> So we move it to the multifd channels thread only variables, and we
>> >> introduce a new bool sync_needed on the send side to pass that information.
>> >>
>> >> Signed-off-by: Juan Quintela <quintela@redhat.com>
>> >> ---
>> >> migration/multifd.h | 10 ++++++----
>> >> migration/multifd.c | 23 +++++++++++++----------
>> >> 2 files changed, 19 insertions(+), 14 deletions(-)
>> >>
>> >> diff --git a/migration/multifd.h b/migration/multifd.h
>> >> index 36f899c56f..a67cefc0a2 100644
>> >> --- a/migration/multifd.h
>> >> +++ b/migration/multifd.h
>> >> @@ -98,12 +98,12 @@ typedef struct {
>> >
>> > Just noticed having no name in 'typedef struct' line makes it harder to
>> > understand what is going on.
>>
>> It is common idiom in QEMU. The principal reason is that if you don't
>> want anyone to use "struct MultiFDSendParams" but MultiFDSendParams, the
>> best way to achieve that is to do it this way.
>
> I agree, but a comment after the typedef could help reviewing. Something like
>
> typedef struct { /* MultiFDSendParams */
> ...
> } MultiFDSendParams
You have a point here. Not putting a comment, putting the real thing.
Thanks, Juan.
next prev parent reply other threads:[~2022-08-23 13:08 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-02 6:38 [PATCH v7 00/12] Migration: Transmit and detect zero pages in the multifd threads Juan Quintela
2022-08-02 6:38 ` [PATCH v7 01/12] multifd: Create page_size fields into both MultiFD{Recv, Send}Params Juan Quintela
2022-08-11 8:10 ` [PATCH v7 01/12] multifd: Create page_size fields into both MultiFD{Recv,Send}Params Leonardo Brás
2022-08-13 15:41 ` Juan Quintela
2022-08-02 6:38 ` [PATCH v7 02/12] multifd: Create page_count fields into both MultiFD{Recv, Send}Params Juan Quintela
2022-08-11 8:10 ` [PATCH v7 02/12] multifd: Create page_count fields into both MultiFD{Recv,Send}Params Leonardo Brás
2022-08-02 6:38 ` [PATCH v7 03/12] migration: Export ram_transferred_ram() Juan Quintela
2022-08-11 8:11 ` Leonardo Brás
2022-08-13 15:36 ` Juan Quintela
2022-08-02 6:38 ` [PATCH v7 04/12] multifd: Count the number of bytes sent correctly Juan Quintela
2022-08-11 8:11 ` Leonardo Brás
2022-08-19 9:35 ` Juan Quintela
2022-08-02 6:39 ` [PATCH v7 05/12] migration: Make ram_save_target_page() a pointer Juan Quintela
2022-08-11 8:11 ` Leonardo Brás
2022-08-19 9:51 ` Juan Quintela
2022-08-20 7:14 ` Leonardo Bras Soares Passos
2022-08-22 21:35 ` Juan Quintela
2022-08-02 6:39 ` [PATCH v7 06/12] multifd: Make flags field thread local Juan Quintela
2022-08-11 9:04 ` Leonardo Brás
2022-08-19 10:03 ` Juan Quintela
2022-08-20 7:24 ` Leonardo Bras Soares Passos
2022-08-23 13:00 ` Juan Quintela [this message]
2022-08-02 6:39 ` [PATCH v7 07/12] multifd: Prepare to send a packet without the mutex held Juan Quintela
2022-08-11 9:16 ` Leonardo Brás
2022-08-19 11:32 ` Juan Quintela
2022-08-20 7:27 ` Leonardo Bras Soares Passos
2022-08-02 6:39 ` [PATCH v7 08/12] multifd: Add capability to enable/disable zero_page Juan Quintela
2022-08-11 9:29 ` Leonardo Brás
2022-08-19 11:36 ` Juan Quintela
2022-08-02 6:39 ` [PATCH v7 09/12] migration: Export ram_release_page() Juan Quintela
2022-08-11 9:31 ` Leonardo Brás
2022-08-02 6:39 ` [PATCH v7 10/12] multifd: Support for zero pages transmission Juan Quintela
2022-09-02 13:27 ` Leonardo Brás
2022-11-14 12:09 ` Juan Quintela
2022-10-25 9:10 ` chuang xu
2022-11-14 12:10 ` Juan Quintela
2022-08-02 6:39 ` [PATCH v7 11/12] multifd: Zero " Juan Quintela
2022-09-02 13:27 ` Leonardo Brás
2022-11-14 12:20 ` Juan Quintela
2022-11-14 12:27 ` Juan Quintela
2022-08-02 6:39 ` [PATCH v7 12/12] So we use multifd to transmit zero pages Juan Quintela
2022-09-02 13:27 ` Leonardo Brás
2022-11-14 12:30 ` Juan Quintela
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