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[PATCH 3/6] qemu/main-loop: rename qemu_cond_wait_iothread() to qemu_cond_wait_bql()

Stefan Hajnoczi posted 6 patches 12 months ago
Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Cameron Esfahani <dirty@apple.com>, Roman Bolshakov <rbolshakov@ddn.com>, Gerd Hoffmann <kraxel@redhat.com>, "Marc-André Lureau" <marcandre.lureau@redhat.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Markus Armbruster <armbru@redhat.com>, Michael Roth <michael.roth@amd.com>, Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>, Stefan Hajnoczi <stefanha@redhat.com>, Kevin Wolf <kwolf@redhat.com>, Hanna Reitz <hreitz@redhat.com>, "Michael S. Tsirkin" <mst@redhat.com>, Peter Xu <peterx@redhat.com>, Jason Wang <jasowang@redhat.com>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, David Woodhouse <dwmw2@infradead.org>, Paul Durrant <paul@xen.org>, Peter Maydell <peter.maydell@linaro.org>, Halil Pasic <pasic@linux.ibm.com>, Christian Borntraeger <borntraeger@linux.ibm.com>, David Hildenbrand <david@redhat.com>, Thomas Huth <thuth@redhat.com>, Jiri Slaby <jslaby@suse.cz>, Jean-Christophe Dubois <jcd@tribudubois.net>, Andrey Smirnov <andrew.smirnov@gmail.com>, Stefano Stabellini <sstabellini@kernel.org>, Anthony Perard <anthony.perard@citrix.com>, BALATON Zoltan <balaton@eik.bme.hu>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, David Gibson <david@gibson.dropbear.id.au>, Harsh Prateek Bora <harshpb@linux.ibm.com>, Elena Ufimtseva <elena.ufimtseva@oracle.com>, Jagannathan Raman <jag.raman@oracle.com>, Eric Farman <farman@linux.ibm.com>, Ilya Leoshkevich <iii@linux.ibm.com>, Fam Zheng <fam@euphon.net>, John Snow <jsnow@redhat.com>, Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>, "Daniel P. Berrangé" <berrange@redhat.com>, Juan Quintela <quintela@redhat.com>, Fabiano Rosas <farosas@suse.de>, Leonardo Bras <leobras@redhat.com>, Eric Blake <eblake@redhat.com>, Hailiang Zhang <zhanghailiang@xfusion.com>, Hyman Huang <yong.huang@smartx.com>, "Alex Bennée" <alex.bennee@linaro.org>, Alexander Graf <agraf@csgraf.de>, Marcelo Tosatti <mtosatti@redhat.com>, Reinoud Zandijk <reinoud@netbsd.org>, Sunil Muthuswamy <sunilmut@microsoft.com>, Song Gao <gaosong@loongson.cn>, Huacai Chen <chenhuacai@kernel.org>, Aurelien Jarno <aurelien@aurel32.net>, Jiaxun Yang <jiaxun.yang@flygoat.com>, Aleksandar Rikalo <aleksandar.rikalo@syrmia.com>, Stafford Horne <shorne@gmail.com>, Palmer Dabbelt <palmer@dabbelt.com>, Alistair Francis <alistair.francis@wdc.com>, Bin Meng <bin.meng@windriver.com>, Weiwei Li <liwei1518@gmail.com>, Liu Zhiwei <zhiwei_liu@linux.alibaba.com>, Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>, Artyom Tarasenko <atar4qemu@gmail.com>, Max Filippov <jcmvbkbc@gmail.com>, Akihiko Odaki <akihiko.odaki@daynix.com>
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[PATCH 3/6] qemu/main-loop: rename qemu_cond_wait_iothread() to qemu_cond_wait_bql()
Posted by Stefan Hajnoczi 12 months ago 
The name "iothread" is overloaded. Use the term Big QEMU Lock (BQL)
instead, it is already widely used and unambiguous.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
---
 include/qemu/main-loop.h          | 8 ++++----
 accel/tcg/tcg-accel-ops-rr.c      | 4 ++--
 hw/display/virtio-gpu.c           | 2 +-
 hw/ppc/spapr_events.c             | 2 +-
 system/cpu-throttle.c             | 2 +-
 system/cpus.c                     | 4 ++--
 target/i386/nvmm/nvmm-accel-ops.c | 2 +-
 target/i386/whpx/whpx-accel-ops.c | 2 +-
 8 files changed, 13 insertions(+), 13 deletions(-)

diff --git a/include/qemu/main-loop.h b/include/qemu/main-loop.h
index 0b6a3e4824..ec2a70f041 100644
--- a/include/qemu/main-loop.h
+++ b/include/qemu/main-loop.h
@@ -373,17 +373,17 @@ G_DEFINE_AUTOPTR_CLEANUP_FUNC(BQLLockAuto, qemu_bql_auto_unlock)
         = qemu_bql_auto_lock(__FILE__, __LINE__)
 
 /*
- * qemu_cond_wait_iothread: Wait on condition for the main loop mutex
+ * qemu_cond_wait_bql: Wait on condition for the main loop mutex
  *
  * This function atomically releases the main loop mutex and causes
  * the calling thread to block on the condition.
  */
-void qemu_cond_wait_iothread(QemuCond *cond);
+void qemu_cond_wait_bql(QemuCond *cond);
 
 /*
- * qemu_cond_timedwait_iothread: like the previous, but with timeout
+ * qemu_cond_timedwait_bql: like the previous, but with timeout
  */
-void qemu_cond_timedwait_iothread(QemuCond *cond, int ms);
+void qemu_cond_timedwait_bql(QemuCond *cond, int ms);
 
 /* internal interfaces */
 
diff --git a/accel/tcg/tcg-accel-ops-rr.c b/accel/tcg/tcg-accel-ops-rr.c
index c21215a094..1e5a688085 100644
--- a/accel/tcg/tcg-accel-ops-rr.c
+++ b/accel/tcg/tcg-accel-ops-rr.c
@@ -111,7 +111,7 @@ static void rr_wait_io_event(void)
 
     while (all_cpu_threads_idle()) {
         rr_stop_kick_timer();
-        qemu_cond_wait_iothread(first_cpu->halt_cond);
+        qemu_cond_wait_bql(first_cpu->halt_cond);
     }
 
     rr_start_kick_timer();
@@ -198,7 +198,7 @@ static void *rr_cpu_thread_fn(void *arg)
 
     /* wait for initial kick-off after machine start */
     while (first_cpu->stopped) {
-        qemu_cond_wait_iothread(first_cpu->halt_cond);
+        qemu_cond_wait_bql(first_cpu->halt_cond);
 
         /* process any pending work */
         CPU_FOREACH(cpu) {
diff --git a/hw/display/virtio-gpu.c b/hw/display/virtio-gpu.c
index b016d3bac8..67c5be1a4e 100644
--- a/hw/display/virtio-gpu.c
+++ b/hw/display/virtio-gpu.c
@@ -1512,7 +1512,7 @@ void virtio_gpu_reset(VirtIODevice *vdev)
         g->reset_finished = false;
         qemu_bh_schedule(g->reset_bh);
         while (!g->reset_finished) {
-            qemu_cond_wait_iothread(&g->reset_cond);
+            qemu_cond_wait_bql(&g->reset_cond);
         }
     } else {
         virtio_gpu_reset_bh(g);
diff --git a/hw/ppc/spapr_events.c b/hw/ppc/spapr_events.c
index deb4641505..cb0eeee587 100644
--- a/hw/ppc/spapr_events.c
+++ b/hw/ppc/spapr_events.c
@@ -899,7 +899,7 @@ void spapr_mce_req_event(PowerPCCPU *cpu, bool recovered)
             }
             return;
         }
-        qemu_cond_wait_iothread(&spapr->fwnmi_machine_check_interlock_cond);
+        qemu_cond_wait_bql(&spapr->fwnmi_machine_check_interlock_cond);
         if (spapr->fwnmi_machine_check_addr == -1) {
             /*
              * If the machine was reset while waiting for the interlock,
diff --git a/system/cpu-throttle.c b/system/cpu-throttle.c
index e98836311b..1d2b73369e 100644
--- a/system/cpu-throttle.c
+++ b/system/cpu-throttle.c
@@ -54,7 +54,7 @@ static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque)
     endtime_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + sleeptime_ns;
     while (sleeptime_ns > 0 && !cpu->stop) {
         if (sleeptime_ns > SCALE_MS) {
-            qemu_cond_timedwait_iothread(cpu->halt_cond,
+            qemu_cond_timedwait_bql(cpu->halt_cond,
                                          sleeptime_ns / SCALE_MS);
         } else {
             qemu_bql_unlock();
diff --git a/system/cpus.c b/system/cpus.c
index d5b98c11f5..eb24a4db8e 100644
--- a/system/cpus.c
+++ b/system/cpus.c
@@ -513,12 +513,12 @@ void qemu_bql_unlock(void)
     qemu_mutex_unlock(&qemu_global_mutex);
 }
 
-void qemu_cond_wait_iothread(QemuCond *cond)
+void qemu_cond_wait_bql(QemuCond *cond)
 {
     qemu_cond_wait(cond, &qemu_global_mutex);
 }
 
-void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
+void qemu_cond_timedwait_bql(QemuCond *cond, int ms)
 {
     qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
 }
diff --git a/target/i386/nvmm/nvmm-accel-ops.c b/target/i386/nvmm/nvmm-accel-ops.c
index 387ccfcce5..0fe8a76820 100644
--- a/target/i386/nvmm/nvmm-accel-ops.c
+++ b/target/i386/nvmm/nvmm-accel-ops.c
@@ -48,7 +48,7 @@ static void *qemu_nvmm_cpu_thread_fn(void *arg)
             }
         }
         while (cpu_thread_is_idle(cpu)) {
-            qemu_cond_wait_iothread(cpu->halt_cond);
+            qemu_cond_wait_bql(cpu->halt_cond);
         }
         qemu_wait_io_event_common(cpu);
     } while (!cpu->unplug || cpu_can_run(cpu));
diff --git a/target/i386/whpx/whpx-accel-ops.c b/target/i386/whpx/whpx-accel-ops.c
index 1f29346a88..d8bec46081 100644
--- a/target/i386/whpx/whpx-accel-ops.c
+++ b/target/i386/whpx/whpx-accel-ops.c
@@ -48,7 +48,7 @@ static void *whpx_cpu_thread_fn(void *arg)
             }
         }
         while (cpu_thread_is_idle(cpu)) {
-            qemu_cond_wait_iothread(cpu->halt_cond);
+            qemu_cond_wait_bql(cpu->halt_cond);
         }
         qemu_wait_io_event_common(cpu);
     } while (!cpu->unplug || cpu_can_run(cpu));
-- 
2.42.0
Re: [PATCH 3/6] qemu/main-loop: rename qemu_cond_wait_iothread() to qemu_cond_wait_bql()
Posted by Philippe Mathieu-Daudé 12 months ago 
On 29/11/23 22:26, Stefan Hajnoczi wrote:
> The name "iothread" is overloaded. Use the term Big QEMU Lock (BQL)
> instead, it is already widely used and unambiguous.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> ---
>   include/qemu/main-loop.h          | 8 ++++----
>   accel/tcg/tcg-accel-ops-rr.c      | 4 ++--
>   hw/display/virtio-gpu.c           | 2 +-
>   hw/ppc/spapr_events.c             | 2 +-
>   system/cpu-throttle.c             | 2 +-
>   system/cpus.c                     | 4 ++--
>   target/i386/nvmm/nvmm-accel-ops.c | 2 +-
>   target/i386/whpx/whpx-accel-ops.c | 2 +-
>   8 files changed, 13 insertions(+), 13 deletions(-)

Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Re: [PATCH 3/6] qemu/main-loop: rename qemu_cond_wait_iothread() to qemu_cond_wait_bql()
Posted by Cédric Le Goater 12 months ago 
On 11/29/23 22:26, Stefan Hajnoczi wrote:
> The name "iothread" is overloaded. Use the term Big QEMU Lock (BQL)
> instead, it is already widely used and unambiguous.
> 
> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>


Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.

Patchew 2.1-devel-b67e4c2

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