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aio-posix: Adjust polling time also for new handlers

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aio_dispatch_handler() adds handlers to ctx->poll_aio_handlers if
polling should be enabled. If we call adjust_polling_time() for all
polling handlers before this, new polling handlers are still left at
poll->ns = 0 and polling is only actually enabled after the next event.
Move the adjust_polling_time() call after aio_dispatch_handler().

This fixes test-nested-aio-poll, which expects that polling becomes
effective the first time around.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20250311141912.135657-1-kwolf@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Kevin Wolf 2025-03-11 15:19:12 +01:00
parent ee416407b3
commit f76d3bee75
1 changed files with 17 additions and 11 deletions
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28
util/aio-posix.c
View file

@ -28,6 +28,9 @@
/* Stop userspace polling on a handler if it isn't active for some time */
#define POLL_IDLE_INTERVAL_NS (7 * NANOSECONDS_PER_SECOND)
static void adjust_polling_time(AioContext *ctx, AioPolledEvent *poll,
int64_t block_ns);
bool aio_poll_disabled(AioContext *ctx)
{
return qatomic_read(&ctx->poll_disable_cnt);
@ -392,7 +395,8 @@ static bool aio_dispatch_handler(AioContext *ctx, AioHandler *node)
* scanning all handlers with aio_dispatch_handlers().
*/
static bool aio_dispatch_ready_handlers(AioContext *ctx,
AioHandlerList *ready_list)
AioHandlerList *ready_list,
int64_t block_ns)
{
bool progress = false;
AioHandler *node;
@ -400,6 +404,14 @@ static bool aio_dispatch_ready_handlers(AioContext *ctx,
while ((node = QLIST_FIRST(ready_list))) {
QLIST_REMOVE(node, node_ready);
progress = aio_dispatch_handler(ctx, node) || progress;
/*
* Adjust polling time only after aio_dispatch_handler(), which can
* add the handler to ctx->poll_aio_handlers.
*/
if (ctx->poll_max_ns && QLIST_IS_INSERTED(node, node_poll)) {
adjust_polling_time(ctx, &node->poll, block_ns);
}
}
return progress;
@ -653,6 +665,7 @@ bool aio_poll(AioContext *ctx, bool blocking)
bool use_notify_me;
int64_t timeout;
int64_t start = 0;
int64_t block_ns = 0;
/*
* There cannot be two concurrent aio_poll calls for the same AioContext (or
@ -725,20 +738,13 @@ bool aio_poll(AioContext *ctx, bool blocking)
aio_notify_accept(ctx);
/* Adjust polling time */
/* Calculate blocked time for adaptive polling */
if (ctx->poll_max_ns) {
AioHandler *node;
int64_t block_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - start;
QLIST_FOREACH(node, &ctx->poll_aio_handlers, node_poll) {
if (QLIST_IS_INSERTED(node, node_ready)) {
adjust_polling_time(ctx, &node->poll, block_ns);
}
}
block_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - start;
}
progress |= aio_bh_poll(ctx);
progress |= aio_dispatch_ready_handlers(ctx, &ready_list);
progress |= aio_dispatch_ready_handlers(ctx, &ready_list, block_ns);
aio_free_deleted_handlers(ctx);