From: David Edmondson <david.edmondson@oracle.com>
To: qemu-devel@nongnu.org
Cc: Kevin Wolf <kwolf@redhat.com>,
qemu-block@nongnu.org, Stefan Weil <sw@weilnetz.de>,
Max Reitz <mreitz@redhat.com>,
David Edmondson <david.edmondson@oracle.com>,
Stefan Hajnoczi <stefanha@redhat.com>
Subject: [RFC PATCH 3/4] coroutine/mutex: Store the coroutine in the CoWaitRecord only once
Date: Tue, 9 Mar 2021 10:21:56 +0000 [thread overview]
Message-ID: <20210309102157.365356-4-david.edmondson@oracle.com> (raw)
In-Reply-To: <20210309102157.365356-1-david.edmondson@oracle.com>
When taking the slow path for mutex acquisition, set the coroutine
value in the CoWaitRecord in push_waiter(), rather than both there and
in the caller.
Signed-off-by: David Edmondson <david.edmondson@oracle.com>
---
util/qemu-coroutine-lock.c | 1 -
1 file changed, 1 deletion(-)
diff --git a/util/qemu-coroutine-lock.c b/util/qemu-coroutine-lock.c
index 5816bf8900..eb73cf11dc 100644
--- a/util/qemu-coroutine-lock.c
+++ b/util/qemu-coroutine-lock.c
@@ -204,7 +204,6 @@ static void coroutine_fn qemu_co_mutex_lock_slowpath(AioContext *ctx,
unsigned old_handoff;
trace_qemu_co_mutex_lock_entry(mutex, self);
- w.co = self;
push_waiter(mutex, &w);
/* This is the "Responsibility Hand-Off" protocol; a lock() picks from
--
2.30.1
next prev parent reply other threads:[~2021-03-09 10:25 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-09 10:21 [RFC PATCH 0/4] coroutine rwlock downgrade fix, minor VDI changes David Edmondson
2021-03-09 10:21 ` [RFC PATCH 1/4] block/vdi: When writing new bmap entry fails, don't leak the buffer David Edmondson
2021-03-09 11:09 ` Philippe Mathieu-Daudé
2021-03-09 11:58 ` David Edmondson
2021-03-09 12:06 ` Philippe Mathieu-Daudé
2021-03-09 13:07 ` Paolo Bonzini
2021-03-09 10:21 ` [RFC PATCH 2/4] block/vdi: Don't assume that blocks are larger than VdiHeader David Edmondson
2021-03-09 10:21 ` David Edmondson [this message]
2021-03-09 10:49 ` [RFC PATCH 3/4] coroutine/mutex: Store the coroutine in the CoWaitRecord only once Paolo Bonzini
2021-03-09 11:11 ` Philippe Mathieu-Daudé
2021-03-09 10:21 ` [RFC PATCH 4/4] coroutine/rwlock: Wake writers in preference to readers David Edmondson
2021-03-09 10:59 ` Paolo Bonzini
2021-03-09 11:06 ` Paolo Bonzini
2021-03-09 11:57 ` David Edmondson
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