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From: Richard Henderson <richard.henderson@linaro.org>
To: Paolo Bonzini <pbonzini@redhat.com>, qemu-devel@nongnu.org
Cc: peterx@redhat.com, imammedo@redhat.com
Subject: Re: [PATCH 17/18] accel: make all calls to qemu_wait_io_event look the same
Date: Sat, 30 Aug 2025 08:16:11 +1000	[thread overview]
Message-ID: <7deb3e06-96a6-4ad8-ac51-6387b5f51ccf@linaro.org> (raw)
In-Reply-To: <20250829153115.1590048-13-pbonzini@redhat.com>

On 8/30/25 01:31, Paolo Bonzini wrote:
> There is no reason for some accelerators to use qemu_wait_io_event_common
> (which is separated from qemu_wait_io_event() specifically for round
> robin).  They can also check for events directly on the first pass through
> the loop, instead of setting cpu->exit_request to true.
> 
> Signed-off-by: Paolo Bonzini<pbonzini@redhat.com>
> ---
>   accel/dummy-cpus.c                |  2 +-
>   accel/hvf/hvf-accel-ops.c         |  2 +-
>   accel/kvm/kvm-accel-ops.c         |  3 ++-
>   accel/tcg/tcg-accel-ops-mttcg.c   |  7 ++---
>   accel/tcg/tcg-accel-ops-rr.c      | 43 ++++++++++++++-----------------
>   target/i386/nvmm/nvmm-accel-ops.c |  6 ++---
>   target/i386/whpx/whpx-accel-ops.c |  6 ++---
>   7 files changed, 30 insertions(+), 39 deletions(-)


Reviewed-by: Richard Henderson <richard.henderson@linaro.org>


To-do for myself: It appears as if we can reduce the number of checks for cpu == NULL in 
the rr loop by moving the cpu=first_cpu assignment to the right place.


r~


  reply	other threads:[~2025-08-30 16:12 UTC|newest]

Thread overview: 58+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-29 15:28 [PATCH v2 00/18] accel, cpus: clean up cpu->exit_request Paolo Bonzini
2025-08-29 15:28 ` [PATCH 01/18] target/ppc: limit cpu_interrupt_exittb to system emulation Paolo Bonzini
2025-08-29 21:32   ` Richard Henderson
2025-09-01 13:03   ` Igor Mammedov
2025-08-29 15:28 ` [PATCH 02/18] target/sparc: limit cpu_check_irqs " Paolo Bonzini
2025-08-29 21:32   ` Richard Henderson
2025-09-01 11:20   ` Philippe Mathieu-Daudé
2025-08-29 15:28 ` [PATCH 03/18] target/i386: limit a20 " Paolo Bonzini
2025-08-29 21:32   ` Richard Henderson
2025-09-01  7:44   ` Philippe Mathieu-Daudé
2025-09-01 13:05   ` Igor Mammedov
2025-08-29 15:28 ` [PATCH 04/18] target-arm: remove uses of cpu_interrupt() for user-mode emulation Paolo Bonzini
2025-08-29 22:18   ` Richard Henderson
2025-08-29 15:31 ` [PATCH 05/18] user-exec: remove cpu_interrupt() stub Paolo Bonzini
2025-08-29 21:33   ` Richard Henderson
2025-09-01 11:22   ` Philippe Mathieu-Daudé
2025-08-29 15:31 ` [PATCH 06/18] treewide: clear bits of cs->interrupt_request with cpu_reset_interrupt() Paolo Bonzini
2025-08-29 21:34   ` Richard Henderson
2025-09-01 11:23   ` Philippe Mathieu-Daudé
2025-09-01 11:35     ` Philippe Mathieu-Daudé
2025-09-01 12:59   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 07/18] cpu-common: use atomic access for interrupt_request Paolo Bonzini
2025-08-29 21:38   ` Richard Henderson
2025-09-01  8:00   ` Philippe Mathieu-Daudé
2025-09-01 13:01   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 08/18] cpus: document that qemu_cpu_kick() can be used for BQL-less operation Paolo Bonzini
2025-08-29 21:39   ` Richard Henderson
2025-08-29 15:31 ` [PATCH 09/18] accel: use store_release/load_acquire for cross-thread exit_request Paolo Bonzini
2025-09-01 13:13   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 10/18] accel: use atomic accesses for exit_request Paolo Bonzini
2025-09-01 13:15   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 11/18] accel/tcg: create a thread-kick function for TCG Paolo Bonzini
2025-08-29 21:41   ` Richard Henderson
2025-09-01  8:03   ` Philippe Mathieu-Daudé
2025-09-01 13:19   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 12/18] accel/tcg: inline cpu_exit() Paolo Bonzini
2025-08-29 21:41   ` Richard Henderson
2025-09-01 13:21   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 13/18] cpus: remove TCG-ism from cpu_exit() Paolo Bonzini
2025-09-01 13:22   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 14/18] cpus: properly kick CPUs out of inner execution loop Paolo Bonzini
2025-08-29 21:56   ` Richard Henderson
2025-08-29 23:05     ` Paolo Bonzini
2025-08-30  3:04       ` Richard Henderson
2025-08-29 15:31 ` [PATCH 15/18] bsd-user, linux-user: introduce qemu_wait_io_event Paolo Bonzini
2025-08-29 22:11   ` Richard Henderson
2025-09-01 11:32   ` Philippe Mathieu-Daudé
2025-08-29 15:31 ` [PATCH 16/18] cpus: clear exit_request in qemu_wait_io_event Paolo Bonzini
2025-08-29 22:11   ` Richard Henderson
2025-08-29 22:19     ` Paolo Bonzini
2025-09-01 13:32   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 17/18] accel: make all calls to qemu_wait_io_event look the same Paolo Bonzini
2025-08-29 22:16   ` Richard Henderson [this message]
2025-09-01 11:29     ` Philippe Mathieu-Daudé
2025-09-01 11:31   ` Philippe Mathieu-Daudé
2025-09-01 13:32   ` Igor Mammedov
2025-08-29 15:31 ` [PATCH 18/18] tcg/user: do not set exit_request gratuitously Paolo Bonzini
2025-09-01 13:33   ` Igor Mammedov

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