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From 59776df6fa3156a467e889ae00751da4bf6857eb Mon Sep 17 00:00:00 2001
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From: Fam Zheng <famz@redhat.com>
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Date: Tue, 9 Oct 2018 08:16:50 +0100
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Subject: [PATCH 06/17] aio-posix: compute timeout before polling
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RH-Author: Fam Zheng <famz@redhat.com>
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Message-id: <20181009081651.15463-5-famz@redhat.com>
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Patchwork-id: 82453
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O-Subject: [RHEL8/rhel qemu-kvm PATCH 4/5] aio-posix: compute timeout before polling
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Bugzilla: 1632622
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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From: Paolo Bonzini <pbonzini@redhat.com>
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BZ: 1632622
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This is a preparation for the next patch, and also a very small
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optimization. Compute the timeout only once, before invoking
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try_poll_mode, and adjust it in run_poll_handlers. The adjustment
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is the polling time when polling fails, or zero (non-blocking) if
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polling succeeds.
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Fixes: 70232b5253a3c4e03ed1ac47ef9246a8ac66c6fa
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Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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Message-Id: <20180912171040.1732-3-pbonzini@redhat.com>
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Reviewed-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Fam Zheng <famz@redhat.com>
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(cherry picked from commit e30cffa04d52e35996569f1cfac111be19576bde)
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Signed-off-by: Fam Zheng <famz@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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util/aio-posix.c | 59 ++++++++++++++++++++++++++++++++-----------------------
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util/trace-events | 4 ++--
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2 files changed, 36 insertions(+), 27 deletions(-)
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diff --git a/util/aio-posix.c b/util/aio-posix.c
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index 1d7cc53..1b17597 100644
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--- a/util/aio-posix.c
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+++ b/util/aio-posix.c
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@@ -490,7 +490,7 @@ static void add_pollfd(AioHandler *node)
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npfd++;
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}
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-static bool run_poll_handlers_once(AioContext *ctx)
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+static bool run_poll_handlers_once(AioContext *ctx, int64_t *timeout)
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{
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bool progress = false;
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AioHandler *node;
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@@ -500,6 +500,7 @@ static bool run_poll_handlers_once(AioContext *ctx)
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aio_node_check(ctx, node->is_external) &&
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node->io_poll(node->opaque) &&
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node->opaque != &ctx->notifier) {
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+ *timeout = 0;
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progress = true;
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}
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@@ -522,31 +523,38 @@ static bool run_poll_handlers_once(AioContext *ctx)
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*
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* Returns: true if progress was made, false otherwise
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*/
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-static bool run_poll_handlers(AioContext *ctx, int64_t max_ns)
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+static bool run_poll_handlers(AioContext *ctx, int64_t max_ns, int64_t *timeout)
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{
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bool progress;
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- int64_t end_time;
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+ int64_t start_time, elapsed_time;
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assert(ctx->notify_me);
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assert(qemu_lockcnt_count(&ctx->list_lock) > 0);
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- trace_run_poll_handlers_begin(ctx, max_ns);
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-
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- end_time = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + max_ns;
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+ trace_run_poll_handlers_begin(ctx, max_ns, *timeout);
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+ start_time = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
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do {
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- progress = run_poll_handlers_once(ctx);
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- } while (!progress && qemu_clock_get_ns(QEMU_CLOCK_REALTIME) < end_time
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+ progress = run_poll_handlers_once(ctx, timeout);
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+ elapsed_time = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - start_time;
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+ } while (!progress && elapsed_time < max_ns
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&& !atomic_read(&ctx->poll_disable_cnt));
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- trace_run_poll_handlers_end(ctx, progress);
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+ /* If time has passed with no successful polling, adjust *timeout to
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+ * keep the same ending time.
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+ */
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ae23c9 |
+ if (*timeout != -1) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ *timeout -= MIN(*timeout, elapsed_time);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ }
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ae23c9 |
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ae23c9 |
+ trace_run_poll_handlers_end(ctx, progress, *timeout);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
return progress;
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ae23c9 |
}
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ae23c9 |
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ae23c9 |
/* try_poll_mode:
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ae23c9 |
* @ctx: the AioContext
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ae23c9 |
- * @blocking: busy polling is only attempted when blocking is true
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ae23c9 |
+ * @timeout: timeout for blocking wait, computed by the caller and updated if
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ae23c9 |
+ * polling succeeds.
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
*
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ae23c9 |
* ctx->notify_me must be non-zero so this function can detect aio_notify().
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ae23c9 |
*
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -554,19 +562,16 @@ static bool run_poll_handlers(AioContext *ctx, int64_t max_ns)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
*
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
* Returns: true if progress was made, false otherwise
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
*/
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
-static bool try_poll_mode(AioContext *ctx, bool blocking)
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ae23c9 |
+static bool try_poll_mode(AioContext *ctx, int64_t *timeout)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
{
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ae23c9 |
- if (blocking && ctx->poll_max_ns && !atomic_read(&ctx->poll_disable_cnt)) {
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ae23c9 |
- /* See qemu_soonest_timeout() uint64_t hack */
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- int64_t max_ns = MIN((uint64_t)aio_compute_timeout(ctx),
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- (uint64_t)ctx->poll_ns);
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ /* See qemu_soonest_timeout() uint64_t hack */
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ int64_t max_ns = MIN((uint64_t)*timeout, (uint64_t)ctx->poll_ns);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
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ae23c9 |
- if (max_ns) {
|
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ae23c9 |
- poll_set_started(ctx, true);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ if (max_ns && !atomic_read(&ctx->poll_disable_cnt)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ poll_set_started(ctx, true);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
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ae23c9 |
- if (run_poll_handlers(ctx, max_ns)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- return true;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ if (run_poll_handlers(ctx, max_ns, timeout)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ return true;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -575,7 +580,7 @@ static bool try_poll_mode(AioContext *ctx, bool blocking)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
/* Even if we don't run busy polling, try polling once in case it can make
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
* progress and the caller will be able to avoid ppoll(2)/epoll_wait(2).
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
*/
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- return run_poll_handlers_once(ctx);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ return run_poll_handlers_once(ctx, timeout);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
bool aio_poll(AioContext *ctx, bool blocking)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -605,8 +610,14 @@ bool aio_poll(AioContext *ctx, bool blocking)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
start = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- progress = try_poll_mode(ctx, blocking);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- if (!progress) {
|
|
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ae23c9 |
+ timeout = blocking ? aio_compute_timeout(ctx) : 0;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ progress = try_poll_mode(ctx, &timeout);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ assert(!(timeout && progress));
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+
|
|
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ae23c9 |
+ /* If polling is allowed, non-blocking aio_poll does not need the
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ * system call---a single round of run_poll_handlers_once suffices.
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ */
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+ if (timeout || atomic_read(&ctx->poll_disable_cnt)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
assert(npfd == 0);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
/* fill pollfds */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -620,8 +631,6 @@ bool aio_poll(AioContext *ctx, bool blocking)
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|
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ae23c9 |
}
|
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ae23c9 |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
- timeout = blocking ? aio_compute_timeout(ctx) : 0;
|
|
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ae23c9 |
-
|
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ae23c9 |
/* wait until next event */
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
if (aio_epoll_check_poll(ctx, pollfds, npfd, timeout)) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
AioHandler epoll_handler;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
diff --git a/util/trace-events b/util/trace-events
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
index 4822434..79569b7 100644
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
--- a/util/trace-events
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+++ b/util/trace-events
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
@@ -1,8 +1,8 @@
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
# See docs/devel/tracing.txt for syntax documentation.
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
# util/aio-posix.c
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
-run_poll_handlers_begin(void *ctx, int64_t max_ns) "ctx %p max_ns %"PRId64
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
-run_poll_handlers_end(void *ctx, bool progress) "ctx %p progress %d"
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+run_poll_handlers_begin(void *ctx, int64_t max_ns, int64_t timeout) "ctx %p max_ns %"PRId64 " timeout %"PRId64
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
+run_poll_handlers_end(void *ctx, bool progress, int64_t timeout) "ctx %p progress %d new timeout %"PRId64
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
ae23c9 |
poll_shrink(void *ctx, int64_t old, int64_t new) "ctx %p old %"PRId64" new %"PRId64
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poll_grow(void *ctx, int64_t old, int64_t new) "ctx %p old %"PRId64" new %"PRId64
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1.8.3.1
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