* [PATCH] softmmu/physmem.c: Fix typo in comment
@ 2021-10-15 9:29 Greg Kurz
2021-10-15 9:30 ` David Hildenbrand
2021-10-19 7:47 ` Laurent Vivier
0 siblings, 2 replies; 3+ messages in thread
From: Greg Kurz @ 2021-10-15 9:29 UTC (permalink / raw)
To: qemu-devel
Cc: qemu-trivial, Paolo Bonzini, Philippe Mathieu-Daudé,
Peter Xu, David Hildenbrand
Fix the comment to match what the code is doing, as explained in
the changelog of commit 86cf9e154632cb28d749db0ea47946fba8cf3f09
that introduced the change:
Commit 9458a9a1df1a4c719e24512394d548c1fc7abd22 added synchronization
of vCPU and migration operations through calling run_on_cpu operation.
However, in replay mode this synchronization is unneeded, because
I/O and vCPU threads are already synchronized.
This patch disables such synchronization for record/replay mode.
Signed-off-by: Greg Kurz <groug@kaod.org>
---
softmmu/physmem.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/softmmu/physmem.c b/softmmu/physmem.c
index f67ad2998121..555c907f6743 100644
--- a/softmmu/physmem.c
+++ b/softmmu/physmem.c
@@ -2633,7 +2633,7 @@ static void tcg_log_global_after_sync(MemoryListener *listener)
* In record/replay mode this causes a deadlock, because
* run_on_cpu waits for rr mutex. Therefore no races are possible
* in this case and no need for making run_on_cpu when
- * record/replay is not enabled.
+ * record/replay is enabled.
*/
cpuas = container_of(listener, CPUAddressSpace, tcg_as_listener);
run_on_cpu(cpuas->cpu, do_nothing, RUN_ON_CPU_NULL);
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] softmmu/physmem.c: Fix typo in comment
2021-10-15 9:29 [PATCH] softmmu/physmem.c: Fix typo in comment Greg Kurz
@ 2021-10-15 9:30 ` David Hildenbrand
2021-10-19 7:47 ` Laurent Vivier
1 sibling, 0 replies; 3+ messages in thread
From: David Hildenbrand @ 2021-10-15 9:30 UTC (permalink / raw)
To: Greg Kurz, qemu-devel
Cc: qemu-trivial, Paolo Bonzini, Philippe Mathieu-Daudé, Peter Xu
On 15.10.21 11:29, Greg Kurz wrote:
> Fix the comment to match what the code is doing, as explained in
> the changelog of commit 86cf9e154632cb28d749db0ea47946fba8cf3f09
> that introduced the change:
>
> Commit 9458a9a1df1a4c719e24512394d548c1fc7abd22 added synchronization
> of vCPU and migration operations through calling run_on_cpu operation.
> However, in replay mode this synchronization is unneeded, because
> I/O and vCPU threads are already synchronized.
> This patch disables such synchronization for record/replay mode.
>
>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> softmmu/physmem.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/softmmu/physmem.c b/softmmu/physmem.c
> index f67ad2998121..555c907f6743 100644
> --- a/softmmu/physmem.c
> +++ b/softmmu/physmem.c
> @@ -2633,7 +2633,7 @@ static void tcg_log_global_after_sync(MemoryListener *listener)
> * In record/replay mode this causes a deadlock, because
> * run_on_cpu waits for rr mutex. Therefore no races are possible
> * in this case and no need for making run_on_cpu when
> - * record/replay is not enabled.
> + * record/replay is enabled.
> */
> cpuas = container_of(listener, CPUAddressSpace, tcg_as_listener);
> run_on_cpu(cpuas->cpu, do_nothing, RUN_ON_CPU_NULL);
>
>
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] softmmu/physmem.c: Fix typo in comment
2021-10-15 9:29 [PATCH] softmmu/physmem.c: Fix typo in comment Greg Kurz
2021-10-15 9:30 ` David Hildenbrand
@ 2021-10-19 7:47 ` Laurent Vivier
1 sibling, 0 replies; 3+ messages in thread
From: Laurent Vivier @ 2021-10-19 7:47 UTC (permalink / raw)
To: Greg Kurz, qemu-devel
Cc: qemu-trivial, Paolo Bonzini, Philippe Mathieu-Daudé,
Peter Xu, David Hildenbrand
Le 15/10/2021 à 11:29, Greg Kurz a écrit :
> Fix the comment to match what the code is doing, as explained in
> the changelog of commit 86cf9e154632cb28d749db0ea47946fba8cf3f09
> that introduced the change:
>
> Commit 9458a9a1df1a4c719e24512394d548c1fc7abd22 added synchronization
> of vCPU and migration operations through calling run_on_cpu operation.
> However, in replay mode this synchronization is unneeded, because
> I/O and vCPU threads are already synchronized.
> This patch disables such synchronization for record/replay mode.
>
>
> Signed-off-by: Greg Kurz <groug@kaod.org>
> ---
> softmmu/physmem.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/softmmu/physmem.c b/softmmu/physmem.c
> index f67ad2998121..555c907f6743 100644
> --- a/softmmu/physmem.c
> +++ b/softmmu/physmem.c
> @@ -2633,7 +2633,7 @@ static void tcg_log_global_after_sync(MemoryListener *listener)
> * In record/replay mode this causes a deadlock, because
> * run_on_cpu waits for rr mutex. Therefore no races are possible
> * in this case and no need for making run_on_cpu when
> - * record/replay is not enabled.
> + * record/replay is enabled.
> */
> cpuas = container_of(listener, CPUAddressSpace, tcg_as_listener);
> run_on_cpu(cpuas->cpu, do_nothing, RUN_ON_CPU_NULL);
>
>
>
Applied to my trivial-patches branch.
Thanks,
Laurent
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-10-15 9:29 [PATCH] softmmu/physmem.c: Fix typo in comment Greg Kurz
2021-10-15 9:30 ` David Hildenbrand
2021-10-19 7:47 ` Laurent Vivier
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