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 Re: [PATCH 4/6] system/cpus: rename qemu_global_mutex to qemu_bql
 
To: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>From: Stefan Hajnoczi <stefanha@xxxxxxxxxx>Date: Thu, 30 Nov 2023 15:31:32 -0500Cc: qemu-devel@xxxxxxxxxx, Jean-Christophe Dubois <jcd@xxxxxxxxxxxxxxx>,	Fabiano Rosas <farosas@xxxxxxx>, qemu-s390x@xxxxxxxxxx,	Song Gao <gaosong@xxxxxxxxxxx>,	Marcel Apfelbaum <marcel.apfelbaum@xxxxxxxxx>,	Thomas Huth <thuth@xxxxxxxxxx>, Hyman Huang <yong.huang@xxxxxxxxxx>,	Marcelo Tosatti <mtosatti@xxxxxxxxxx>,	David Woodhouse <dwmw2@xxxxxxxxxxxxx>,	Andrey Smirnov <andrew.smirnov@xxxxxxxxx>,	Peter Maydell <peter.maydell@xxxxxxxxxx>,	Kevin Wolf <kwolf@xxxxxxxxxx>, Ilya Leoshkevich <iii@xxxxxxxxxxxxx>,	Artyom Tarasenko <atar4qemu@xxxxxxxxx>,	Mark Cave-Ayland <mark.cave-ayland@xxxxxxxxxxxx>,	Max Filippov <jcmvbkbc@xxxxxxxxx>,	Alistair Francis <alistair.francis@xxxxxxx>,	Paul Durrant <paul@xxxxxxx>,	Jagannathan Raman <jag.raman@xxxxxxxxxx>,	Juan Quintela <quintela@xxxxxxxxxx>,	Daniel P. Berrangé <berrange@xxxxxxxxxx>,	qemu-arm@xxxxxxxxxx, Jason Wang <jasowang@xxxxxxxxxx>,	Gerd Hoffmann <kraxel@xxxxxxxxxx>, Hanna Reitz <hreitz@xxxxxxxxxx>,	Marc-André Lureau <marcandre.lureau@xxxxxxxxxx>,	BALATON Zoltan <balaton@xxxxxxxxxx>,	Daniel Henrique Barboza <danielhb413@xxxxxxxxx>,	Elena Ufimtseva <elena.ufimtseva@xxxxxxxxxx>,	Aurelien Jarno <aurelien@xxxxxxxxxxx>,	Hailiang Zhang <zhanghailiang@xxxxxxxxxxx>,	Roman Bolshakov <rbolshakov@xxxxxxx>,	Huacai Chen <chenhuacai@xxxxxxxxxx>, Fam Zheng <fam@xxxxxxxxxx>,	Eric Blake <eblake@xxxxxxxxxx>, Jiri Slaby <jslaby@xxxxxxx>,	Alexander Graf <agraf@xxxxxxxxx>,	Liu Zhiwei <zhiwei_liu@xxxxxxxxxxxxxxxxx>,	Weiwei Li <liwei1518@xxxxxxxxx>, Eric Farman <farman@xxxxxxxxxxxxx>,	Stafford Horne <shorne@xxxxxxxxx>,	David Hildenbrand <david@xxxxxxxxxx>,	Markus Armbruster <armbru@xxxxxxxxxx>,	Reinoud Zandijk <reinoud@xxxxxxxxxx>,	Palmer Dabbelt <palmer@xxxxxxxxxxx>,	Cameron Esfahani <dirty@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx,	Pavel Dovgalyuk <pavel.dovgaluk@xxxxxxxxx>, qemu-riscv@xxxxxxxxxx,	Aleksandar Rikalo <aleksandar.rikalo@xxxxxxxxxx>,	John Snow <jsnow@xxxxxxxxxx>,	Sunil Muthuswamy <sunilmut@xxxxxxxxxxxxx>,	Michael Roth <michael.roth@xxxxxxx>,	David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>,	"Michael S. Tsirkin" <mst@xxxxxxxxxx>,	Richard Henderson <richard.henderson@xxxxxxxxxx>,	Bin Meng <bin.meng@xxxxxxxxxxxxx>,	Stefano Stabellini <sstabellini@xxxxxxxxxx>, kvm@xxxxxxxxxxxxxxx,	qemu-block@xxxxxxxxxx, Halil Pasic <pasic@xxxxxxxxxxxxx>,	Peter Xu <peterx@xxxxxxxxxx>,	Anthony Perard <anthony.perard@xxxxxxxxxx>,	Harsh Prateek Bora <harshpb@xxxxxxxxxxxxx>,	Alex Bennée <alex.bennee@xxxxxxxxxx>,	Eduardo Habkost <eduardo@xxxxxxxxxxx>,	Paolo Bonzini <pbonzini@xxxxxxxxxx>,	Vladimir Sementsov-Ogievskiy <vsementsov@xxxxxxxxxxxxxx>,	Cédric Le Goater <clg@xxxxxxxx>,	qemu-ppc@xxxxxxxxxx,	Christian Borntraeger <borntraeger@xxxxxxxxxxxxx>,	Akihiko Odaki <akihiko.odaki@xxxxxxxxxx>,	Leonardo Bras <leobras@xxxxxxxxxx>,	Nicholas Piggin <npiggin@xxxxxxxxx>,	Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx>Delivery-date: Thu, 30 Nov 2023 20:31:46 +0000List-id: Xen developer discussion <xen-devel.lists.xenproject.org> 
 On Thu, Nov 30, 2023 at 02:44:07PM +0100, Philippe Mathieu-Daudé wrote:
> Hi Stefan,
> 
> On 29/11/23 22:26, Stefan Hajnoczi wrote:
> > The APIs using qemu_global_mutex now follow the Big QEMU Lock (BQL)
> > nomenclature. It's a little strange that the actual QemuMutex variable
> > that embodies the BQL is called qemu_global_mutex instead of qemu_bql.
> > Rename it for consistency.
> > 
> > Signed-off-by: Stefan Hajnoczi <stefanha@xxxxxxxxxx>
> > ---
> >   system/cpus.c | 20 ++++++++++----------
> >   1 file changed, 10 insertions(+), 10 deletions(-)
> > 
> > diff --git a/system/cpus.c b/system/cpus.c
> > index eb24a4db8e..138720a540 100644
> > --- a/system/cpus.c
> > +++ b/system/cpus.c
> > @@ -65,7 +65,7 @@
> >   #endif /* CONFIG_LINUX */
> > -static QemuMutex qemu_global_mutex;
> > +static QemuMutex qemu_bql;
> 
> I thought we were using _cond/_sem/_mutex suffixes, but
> this is not enforced:
I'm open to alternative names. Here are some I can think of:
- big_qemu_lock (although grepping for "bql" won't find it)
- qemu_bql_mutex
If there is no strong feeling about this then let's leave it at
qemu_bql. Otherwise, please discuss.
Thanks,
Stefan
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