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[Qemu-block] [PATCH 4/7] blockjob: allow block_job_throttle to take dela
From: |
John Snow |
Subject: |
[Qemu-block] [PATCH 4/7] blockjob: allow block_job_throttle to take delay_ns |
Date: |
Wed, 13 Dec 2017 19:59:50 -0500 |
Instead of only sleeping for 0ms when we've hit a timeout, optionally
take a longer more explicit delay_ns that always forces the sleep.
Signed-off-by: John Snow <address@hidden>
---
block/mirror.c | 4 ++--
blockjob.c | 9 ++++-----
include/block/blockjob_int.h | 10 +++++++---
3 files changed, 13 insertions(+), 10 deletions(-)
diff --git a/block/mirror.c b/block/mirror.c
index 60b52cfb19..81450e6ac4 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -610,7 +610,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
int bytes = MIN(s->bdev_length - offset,
QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
- block_job_throttle(&s->common);
+ block_job_throttle(&s->common, 0);
if (block_job_is_cancelled(&s->common)) {
s->initial_zeroing_ongoing = false;
@@ -638,7 +638,7 @@ static int coroutine_fn mirror_dirty_init(MirrorBlockJob *s)
int bytes = MIN(s->bdev_length - offset,
QEMU_ALIGN_DOWN(INT_MAX, s->granularity));
- block_job_throttle(&s->common);
+ block_job_throttle(&s->common, 0);
if (block_job_is_cancelled(&s->common)) {
return 0;
diff --git a/blockjob.c b/blockjob.c
index 8d0c89a813..b0868c3ed5 100644
--- a/blockjob.c
+++ b/blockjob.c
@@ -882,12 +882,11 @@ void block_job_yield(BlockJob *job)
block_job_pause_point(job);
}
-void block_job_throttle(BlockJob *job)
+void block_job_throttle(BlockJob *job, int64_t delay_ns)
{
- int64_t now = qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
-
- if (now - job->last_yield_ns > SLICE_TIME) {
- block_job_sleep_ns(job, 0);
+ if (delay_ns || (qemu_clock_get_ns(QEMU_CLOCK_REALTIME) - \
+ job->last_yield_ns > SLICE_TIME)) {
+ block_job_sleep_ns(job, delay_ns);
} else {
block_job_pause_point(job);
}
diff --git a/include/block/blockjob_int.h b/include/block/blockjob_int.h
index 1a771b1e2e..8faec3f5e0 100644
--- a/include/block/blockjob_int.h
+++ b/include/block/blockjob_int.h
@@ -160,11 +160,15 @@ void block_job_yield(BlockJob *job);
/**
* block_job_throttle:
* @job: The job that calls the function.
+ * @delay_ns: The amount of time to sleep for
*
- * Yield if it has been SLICE_TIME nanoseconds since the last yield.
- * Otherwise, check if we need to pause (and update the yield counter).
+ * Sleep for delay_ns nanoseconds.
+ *
+ * If delay_ns is 0, yield if it has been SLICE_TIME
+ * nanoseconds since the last yield. Otherwise, check
+ * if we need to yield for a pause event.
*/
-void block_job_throttle(BlockJob *job);
+void block_job_throttle(BlockJob *job, int64_t delay_ns);
/**
* block_job_pause_all:
--
2.14.3
- [Qemu-block] [PATCH 2/7] blockjob: consolidate SLICE_TIME definition, (continued)
[Qemu-block] [PATCH 6/7] block/stream: use block_job_throttle, John Snow, 2017/12/13
[Qemu-block] [PATCH 7/7] block/backup: use block_job_throttle, John Snow, 2017/12/13