From mboxrd@z Thu Jan 1 00:00:00 1970
Return-Path: <s.reiter@proxmox.com>
Received: from firstgate.proxmox.com (firstgate.proxmox.com [212.224.123.68])
(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
key-exchange X25519 server-signature RSA-PSS (2048 bits))
(No client certificate requested)
by lists.proxmox.com (Postfix) with ESMTPS id 846B662417
for <pve-devel@lists.proxmox.com>; Thu, 20 Aug 2020 15:49:30 +0200 (CEST)
Received: from firstgate.proxmox.com (localhost [127.0.0.1])
by firstgate.proxmox.com (Proxmox) with ESMTP id 7FB902D95F
for <pve-devel@lists.proxmox.com>; Thu, 20 Aug 2020 15:49:00 +0200 (CEST)
Received: from proxmox-new.maurer-it.com (proxmox-new.maurer-it.com
[212.186.127.180])
(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)
key-exchange X25519 server-signature RSA-PSS (2048 bits))
(No client certificate requested)
by firstgate.proxmox.com (Proxmox) with ESMTPS id 9CBD12D947
for <pve-devel@lists.proxmox.com>; Thu, 20 Aug 2020 15:48:59 +0200 (CEST)
Received: from proxmox-new.maurer-it.com (localhost.localdomain [127.0.0.1])
by proxmox-new.maurer-it.com (Proxmox) with ESMTP id 623FB449B0
for <pve-devel@lists.proxmox.com>; Thu, 20 Aug 2020 15:48:59 +0200 (CEST)
From: Stefan Reiter <s.reiter@proxmox.com>
To: pve-devel@lists.proxmox.com
Date: Thu, 20 Aug 2020 15:48:36 +0200
Message-Id: <20200820134837.27407-2-s.reiter@proxmox.com>
X-Mailer: git-send-email 2.20.1
In-Reply-To: <20200820134837.27407-1-s.reiter@proxmox.com>
References: <20200820134837.27407-1-s.reiter@proxmox.com>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
X-SPAM-LEVEL: Spam detection results: 0
AWL -0.056 Adjusted score from AWL reputation of From: address
KAM_DMARC_STATUS 0.01 Test Rule for DKIM or SPF Failure with Strict Alignment
RCVD_IN_DNSWL_MED -2.3 Sender listed at https://www.dnswl.org/,
medium trust
SPF_HELO_NONE 0.001 SPF: HELO does not publish an SPF Record
SPF_PASS -0.001 SPF: sender matches SPF record
Subject: [pve-devel] [RFC qemu 1/2] PVE: Add sequential job transaction
support
X-BeenThere: pve-devel@lists.proxmox.com
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Proxmox VE development discussion <pve-devel.lists.proxmox.com>
List-Unsubscribe: <https://lists.proxmox.com/cgi-bin/mailman/options/pve-devel>,
<mailto:pve-devel-request@lists.proxmox.com?subject=unsubscribe>
List-Archive: <http://lists.proxmox.com/pipermail/pve-devel/>
List-Post: <mailto:pve-devel@lists.proxmox.com>
List-Help: <mailto:pve-devel-request@lists.proxmox.com?subject=help>
List-Subscribe: <https://lists.proxmox.com/cgi-bin/mailman/listinfo/pve-devel>,
<mailto:pve-devel-request@lists.proxmox.com?subject=subscribe>
X-List-Received-Date: Thu, 20 Aug 2020 13:49:30 -0000
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
---
include/qemu/job.h | 12 ++++++++++++
job.c | 24 ++++++++++++++++++++++++
2 files changed, 36 insertions(+)
diff --git a/include/qemu/job.h b/include/qemu/job.h
index 32aabb1c60..f7a6a0926a 100644
--- a/include/qemu/job.h
+++ b/include/qemu/job.h
@@ -280,6 +280,18 @@ 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 bcbbb0be02..901f84dceb 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++;
@@ -841,6 +862,9 @@ 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);
--
2.20.1