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linux-aio: share one LinuxAioState within an AioContext

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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
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13
include/block/aio.h
View file

@ -47,6 +47,9 @@ typedef struct AioHandler AioHandler;
typedef void QEMUBHFunc(void *opaque);
typedef void IOHandler(void *opaque);
struct ThreadPool;
struct LinuxAioState;
struct AioContext {
GSource source;
@ -119,6 +122,13 @@ struct AioContext {
/* Thread pool for performing work and receiving completion callbacks */
struct ThreadPool *thread_pool;
#ifdef CONFIG_LINUX_AIO
/* State for native Linux AIO. Uses aio_context_acquire/release for
* locking.
*/
struct LinuxAioState *linux_aio;
#endif
/* TimerLists for calling timers - one per clock type */
QEMUTimerListGroup tlg;
@ -335,6 +345,9 @@ GSource *aio_get_g_source(AioContext *ctx);
/* Return the ThreadPool bound to this AioContext */
struct ThreadPool *aio_get_thread_pool(AioContext *ctx);
/* Return the LinuxAioState bound to this AioContext */
struct LinuxAioState *aio_get_linux_aio(AioContext *ctx);
/**
* aio_timer_new:
* @ctx: the aio context