Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=0723a69a63beec1ca6e792239ef75d0181387ef0
Commit: 0723a69a63beec1ca6e792239ef75d0181387ef0
Parent: 6b8be6df7f971919622d152d144c8798ad7fd160
Author: Benjamin LaHaise <[EMAIL PROTECTED]>
AuthorDate: Wed Jan 30 13:33:13 2008 +0100
Committer: Ingo Molnar <[EMAIL PROTECTED]>
CommitDate: Wed Jan 30 13:33:13 2008 +0100
x86: fix synchronize_rcu(): high latency on idle system
an otherwise idle system takes about 3 ticks per network
interface in unregister_netdev() due to multiple calls to synchronize_rcu(),
which adds up to quite a few seconds for tearing down thousands of
interfaces. By flushing pending rcu callbacks in the idle loop, the system
makes progress hundreds of times faster. If this is indeed a sane thing to,
it probably needs to be done for other architectures than x86. And yes, the
network stack shouldn't call synchronize_rcu() quite so much, but fixing
that
is a little more involved.
Signed-off-by: Ingo Molnar <[EMAIL PROTECTED]>
Signed-off-by: Thomas Gleixner <[EMAIL PROTECTED]>
---
arch/x86/kernel/process_32.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/process_32.c b/arch/x86/kernel/process_32.c
index 7a61b54..69a69c3 100644
--- a/arch/x86/kernel/process_32.c
+++ b/arch/x86/kernel/process_32.c
@@ -198,6 +198,9 @@ void cpu_idle(void)
rmb();
idle = pm_idle;
+ if (rcu_pending(cpu))
+ rcu_check_callbacks(cpu, 0);
+
if (!idle)
idle = default_idle;
-
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