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aio-poll: avoid unnecessary polling time computation

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Nodes are no longer added to poll_aio_handlers when adaptive polling is
disabled, preventing unnecessary try_poll_mode() calls. This avoids
iterating over all nodes to compute max_ns unnecessarily when polling
is disabled.

Signed-off-by: Jaehoon Kim <jhkim@linux.ibm.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-ID: <20260423195918.661299-2-jhkim@linux.ibm.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Jaehoon Kim
2026-04-23 14:59:16 -05:00
committed by Stefan Hajnoczi
parent 759c456b1d
commit ed21d9d65c
1 changed files with 6 additions and 5 deletions
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11
util/aio-posix.c
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@@ -307,9 +307,8 @@ static bool aio_dispatch_handler(AioContext *ctx, AioHandler *node)
* fdmon_supports_polling(), but only until the fd fires for the first
* time.
*/
if (!QLIST_IS_INSERTED(node, node_deleted) &&
!QLIST_IS_INSERTED(node, node_poll) &&
node->io_poll) {
if (ctx->poll_max_ns && !QLIST_IS_INSERTED(node, node_deleted) &&
!QLIST_IS_INSERTED(node, node_poll) && node->io_poll) {
trace_poll_add(ctx, node, node->pfd.fd, revents);
if (ctx->poll_started && node->io_poll_begin) {
node->io_poll_begin(node->opaque);
@@ -631,7 +630,7 @@ static void adjust_polling_time(AioContext *ctx, AioPolledEvent *poll,
bool aio_poll(AioContext *ctx, bool blocking)
{
AioHandlerList ready_list = QLIST_HEAD_INITIALIZER(ready_list);
bool progress;
bool progress = false;
bool use_notify_me;
int64_t timeout;
int64_t start = 0;
@@ -656,7 +655,9 @@ bool aio_poll(AioContext *ctx, bool blocking)
}
timeout = blocking ? aio_compute_timeout(ctx) : 0;
progress = try_poll_mode(ctx, &ready_list, &timeout);
if (ctx->poll_max_ns != 0) {
progress = try_poll_mode(ctx, &ready_list, &timeout);
}
assert(!(timeout && progress));
/*