From: "tip-bot2 for Peter Zijlstra" <tip-bot2@linutronix.de>
To: linux-tip-commits@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
linux-kernel@vger.kernel.org, x86@kernel.org
Subject: [tip: x86/mm] smp: Micro-optimize smp_call_function_many_cond()
Date: Sat, 06 Mar 2021 12:12:53 -0000 [thread overview]
Message-ID: <161503277342.398.3827662830739276370.tip-bot2@tip-bot2> (raw)
The following commit has been merged into the x86/mm branch of tip:
Commit-ID: d43f17a1da25373580ebb466de7d0641acbf6fd6
Gitweb: https://git.kernel.org/tip/d43f17a1da25373580ebb466de7d0641acbf6fd6
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 02 Mar 2021 08:02:43 +01:00
Committer: Ingo Molnar <mingo@kernel.org>
CommitterDate: Sat, 06 Mar 2021 13:00:22 +01:00
smp: Micro-optimize smp_call_function_many_cond()
Call the generic send_call_function_single_ipi() function, which
will avoid the IPI when @last_cpu is idle.
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
kernel/smp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/kernel/smp.c b/kernel/smp.c
index b6375d7..af0d51d 100644
--- a/kernel/smp.c
+++ b/kernel/smp.c
@@ -694,7 +694,7 @@ static void smp_call_function_many_cond(const struct cpumask *mask,
* provided mask.
*/
if (nr_cpus == 1)
- arch_send_call_function_single_ipi(last_cpu);
+ send_call_function_single_ipi(last_cpu);
else if (likely(nr_cpus > 1))
arch_send_call_function_ipi_mask(cfd->cpumask_ipi);
}
next reply other threads:[~2021-03-06 12:14 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-06 12:12 tip-bot2 for Peter Zijlstra [this message]
-- strict thread matches above, loose matches on Subject: below --
2021-03-02 9:54 [tip: x86/mm] smp: Micro-optimize smp_call_function_many_cond() tip-bot2 for Ingo Molnar
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