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Message-Id: <1386376806-924-6-git-send-email-rkrcmar@redhat.com> Date: Sat, 7 Dec 2013 01:40:06 +0100 From: Radim Krčmář <rkrcmar@...hat.com> To: linux-kernel@...r.kernel.org Cc: kvm@...r.kernel.org, linux-arch@...r.kernel.org, rostedt@...dmis.org, pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com, hpa@...or.com, x86@...nel.org, arnd@...db.de, rusty@...tcorp.com.au, Radim Krčmář <rkrcmar@...hat.com> Subject: [PATCH v2 5/5] static_key: improve deferred inc behavior We can cancel deferred static_key_slow_dec() instead of increasing .enabled.counter. Timer now won't fire before 'timeout' since the last increase, so this patch further stabilizes the case of frequent switching. Signed-off-by: Radim Krčmář <rkrcmar@...hat.com> --- kernel/jump_label.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/jump_label.c b/kernel/jump_label.c index bd7ad31..9b57261 100644 --- a/kernel/jump_label.c +++ b/kernel/jump_label.c @@ -79,7 +79,8 @@ void static_key_slow_inc_deferred(struct static_key_deferred *key) STATIC_KEY_CHECK_USE(); if (atomic_dec_if_positive(&key->enabled_debt) >= 0) return; - static_key_slow_inc(&key->key); + if (!cancel_delayed_work(&key->work)) + static_key_slow_inc(&key->key); } EXPORT_SYMBOL_GPL(static_key_slow_inc_deferred); -- 1.8.4.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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