motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-08-02 23:33:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

linux-aio: share one LinuxAioState within an AioContext

Browse source 
This has better performance because it executes fewer system calls
and does not use a bottom half per disk.

Originally proposed by Ming Lei.

[Changed #include "raw-aio.h" to "block/raw-aio.h" in win32-aio.c to fix
build error as reported by Peter Maydell <peter.maydell@linaro.org>.
--Stefan]

Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 1467650000-51385-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

squash! linux-aio: share one LinuxAioState within an AioContext
This commit is contained in:
Paolo Bonzini 2016-07-04 18:33:20 +02:00 • committed by Stefan Hajnoczi
parent 4e90ccc28e
commit 0187f5c9cb
7 changed files with 58 additions and 111 deletions
Download patch file Download diff file Expand all files Collapse all files

10
block/linux-aio.c
View file

@ -50,6 +50,8 @@ typedef struct {
} LaioQueue;
struct LinuxAioState {
AioContext *aio_context;
io_context_t ctx;
EventNotifier e;
@ -227,15 +229,14 @@ static void ioq_submit(LinuxAioState *s)
void laio_io_plug(BlockDriverState *bs, LinuxAioState *s)
{
assert(!s->io_q.plugged);
s->io_q.plugged = 1;
s->io_q.plugged++;
}
void laio_io_unplug(BlockDriverState *bs, LinuxAioState *s)
{
assert(s->io_q.plugged);
s->io_q.plugged = 0;
if (!s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending)) {
if (--s->io_q.plugged == 0 &&
!s->io_q.blocked && !QSIMPLEQ_EMPTY(&s->io_q.pending)) {
ioq_submit(s);
}
}
@ -325,6 +326,7 @@ void laio_detach_aio_context(LinuxAioState *s, AioContext *old_context)
void laio_attach_aio_context(LinuxAioState *s, AioContext *new_context)
{
s->aio_context = new_context;
s->completion_bh = aio_bh_new(new_context, qemu_laio_completion_bh, s);
aio_set_event_notifier(new_context, &s->e, false,
qemu_laio_completion_cb);