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[Qemu-devel] [PATCH v2 00/10] aio_context_acquire/release pushdown, part
From: |
Paolo Bonzini |
Subject: |
[Qemu-devel] [PATCH v2 00/10] aio_context_acquire/release pushdown, part 1 |
Date: |
Wed, 21 Dec 2016 15:03:41 +0100 |
This is the first step of pushing down the AioContext lock. Bottom halves
are already protected by their own lock, use it also for walking_bh
and for the handlers list (including walking_handlers). The (lock,
walking_foo) pair is wrapped into the QemuLockCnt primitive.
Paolo
v1->v2:
rebased on top of polling patches
moved documentation to include/
new patch "aio-posix: split aio_dispatch_handlers out of aio_dispatch"
replaced atomic_read with atomic_mb_read in qemu_lockcnt_inc
replaced futex* function and macro names with qemu_futex*
removed atomic access to node->pfd.revents (because there is no
concurrent aio_poll anymore after the BDRV_POLL_WHILE series)
left "aio: push aio_context_acquire/release down to dispatching"
to a later series
Paolo Bonzini (10):
aio: rename bh_lock to list_lock
qemu-thread: introduce QemuLockCnt
aio: make ctx->list_lock a QemuLockCnt, subsuming ctx->walking_bh
qemu-thread: optimize QemuLockCnt with futexes on Linux
aio-posix: split aio_dispatch_handlers out of aio_dispatch
aio: tweak walking in dispatch phase
aio-posix: remove walking_handlers, protecting AioHandler list with
list_lock
aio-win32: remove walking_handlers, protecting AioHandler list with
list_lock
aio: document locking
async: optimize aio_bh_poll
aio-posix.c | 115 +++++++------
aio-win32.c | 83 ++++++----
async.c | 45 ++---
docs/lockcnt.txt | 277 +++++++++++++++++++++++++++++++
docs/multiple-iothreads.txt | 13 +-
include/block/aio.h | 38 ++---
include/qemu/futex.h | 36 ++++
include/qemu/thread.h | 111 +++++++++++++
util/Makefile.objs | 1 +
util/lockcnt.c | 395 ++++++++++++++++++++++++++++++++++++++++++++
util/qemu-thread-posix.c | 35 +---
util/qemu-thread-win32.c | 2 +-
util/trace-events | 10 ++
13 files changed, 1002 insertions(+), 159 deletions(-)
create mode 100644 docs/lockcnt.txt
create mode 100644 include/qemu/futex.h
create mode 100644 util/lockcnt.c
--
2.9.3
- [Qemu-devel] [PATCH v2 00/10] aio_context_acquire/release pushdown, part 1,
Paolo Bonzini <=
- [Qemu-devel] [PATCH 03/10] aio: make ctx->list_lock a QemuLockCnt, subsuming ctx->walking_bh, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 02/10] qemu-thread: introduce QemuLockCnt, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 01/10] aio: rename bh_lock to list_lock, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 05/10] aio-posix: split aio_dispatch_handlers out of aio_dispatch, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 06/10] aio: tweak walking in dispatch phase, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 10/10] async: optimize aio_bh_poll, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 08/10] aio-win32: remove walking_handlers, protecting AioHandler list with list_lock, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 09/10] aio: document locking, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 04/10] qemu-thread: optimize QemuLockCnt with futexes on Linux, Paolo Bonzini, 2016/12/21
- [Qemu-devel] [PATCH 07/10] aio-posix: remove walking_handlers, protecting AioHandler list with list_lock, Paolo Bonzini, 2016/12/21