8dca018b68
Mostly minor changes, bigger ones summarized: * QEMU's internal backup code now uses a new async system, which allows parallel requests - the default max_workers settings is 64, I chose less, since 64 put enough stress on QEMU that the guest became practically unusable during the backup, and 16 still shows quite a nice measureable performance improvement. Little code changes for us though. * 'malformed' QAPI parameters/functions are now a build error (i.e. using '_' vs '-'), I chose to just whitelist our calls in the name of backwards compatibility. * monitor OOB race fix now uses the upstream variant, cherry-picked from origin/master since it's not in 6.0 by default * last patch fixes a bug with snapshot rollback related to the new yank system Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
98 lines
2.8 KiB
Diff
98 lines
2.8 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
|
|
From: Stefan Reiter <s.reiter@proxmox.com>
|
|
Date: Thu, 20 Aug 2020 14:31:59 +0200
|
|
Subject: [PATCH] PVE: Add sequential job transaction support
|
|
|
|
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
|
|
---
|
|
include/qemu/job.h | 12 ++++++++++++
|
|
job.c | 31 +++++++++++++++++++++++++++++++
|
|
2 files changed, 43 insertions(+)
|
|
|
|
diff --git a/include/qemu/job.h b/include/qemu/job.h
|
|
index efc6fa7544..942ee43bca 100644
|
|
--- a/include/qemu/job.h
|
|
+++ b/include/qemu/job.h
|
|
@@ -285,6 +285,18 @@ typedef enum JobCreateFlags {
|
|
*/
|
|
JobTxn *job_txn_new(void);
|
|
|
|
+/**
|
|
+ * Create a new transaction and set it to sequential mode, i.e. run all jobs
|
|
+ * one after the other instead of at the same time.
|
|
+ */
|
|
+JobTxn *job_txn_new_seq(void);
|
|
+
|
|
+/**
|
|
+ * Helper method to start the first job in a sequential transaction to kick it
|
|
+ * off. Other jobs will be run after this one completes.
|
|
+ */
|
|
+void job_txn_start_seq(JobTxn *txn);
|
|
+
|
|
/**
|
|
* Release a reference that was previously acquired with job_txn_add_job or
|
|
* job_txn_new. If it's the last reference to the object, it will be freed.
|
|
diff --git a/job.c b/job.c
|
|
index 3999b7728c..3ae018cdad 100644
|
|
--- a/job.c
|
|
+++ b/job.c
|
|
@@ -72,6 +72,8 @@ struct JobTxn {
|
|
|
|
/* Reference count */
|
|
int refcnt;
|
|
+
|
|
+ bool sequential;
|
|
};
|
|
|
|
/* Right now, this mutex is only needed to synchronize accesses to job->busy
|
|
@@ -102,6 +104,25 @@ JobTxn *job_txn_new(void)
|
|
return txn;
|
|
}
|
|
|
|
+JobTxn *job_txn_new_seq(void)
|
|
+{
|
|
+ JobTxn *txn = job_txn_new();
|
|
+ txn->sequential = true;
|
|
+ return txn;
|
|
+}
|
|
+
|
|
+void job_txn_start_seq(JobTxn *txn)
|
|
+{
|
|
+ assert(txn->sequential);
|
|
+ assert(!txn->aborting);
|
|
+
|
|
+ Job *first = QLIST_FIRST(&txn->jobs);
|
|
+ assert(first);
|
|
+ assert(first->status == JOB_STATUS_CREATED);
|
|
+
|
|
+ job_start(first);
|
|
+}
|
|
+
|
|
static void job_txn_ref(JobTxn *txn)
|
|
{
|
|
txn->refcnt++;
|
|
@@ -847,6 +868,9 @@ static void job_completed_txn_success(Job *job)
|
|
*/
|
|
QLIST_FOREACH(other_job, &txn->jobs, txn_list) {
|
|
if (!job_is_completed(other_job)) {
|
|
+ if (txn->sequential) {
|
|
+ job_start(other_job);
|
|
+ }
|
|
return;
|
|
}
|
|
assert(other_job->ret == 0);
|
|
@@ -1017,6 +1041,13 @@ int job_finish_sync(Job *job, void (*finish)(Job *, Error **errp), Error **errp)
|
|
return -EBUSY;
|
|
}
|
|
|
|
+ /* in a sequential transaction jobs with status CREATED can appear at time
|
|
+ * of cancelling, these have not begun work so job_enter won't do anything,
|
|
+ * let's ensure they are marked as ABORTING if required */
|
|
+ if (job->status == JOB_STATUS_CREATED && job->txn->sequential) {
|
|
+ job_update_rc(job);
|
|
+ }
|
|
+
|
|
AIO_WAIT_WHILE(job->aio_context,
|
|
(job_enter(job), !job_is_completed(job)));
|
|
|