From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: linux-kernel@vger.kernel.org, mingo@kernel.org,
jasonbaron0@gmail.com, bp@alien8.de, luto@amacapital.net,
tglx@linutronix.de, rostedt@goodmis.org, will.deacon@arm.com,
liuj97@gmail.com, rabin@rab.in, ralf@linux-mips.org,
ddaney@caviumnetworks.com, benh@kernel.crashing.org,
michael@ellerman.id.au, davem@davemloft.net
Subject: Re: [RFC][PATCH 5/7] jump_label: Rework update logic
Date: Tue, 28 Jul 2015 07:54:34 +0200 [thread overview]
Message-ID: <20150728055434.GA4137@osiris> (raw)
In-Reply-To: <20150727163005.GP18673@twins.programming.kicks-ass.net>
On Mon, Jul 27, 2015 at 06:30:05PM +0200, Peter Zijlstra wrote:
> On Mon, Jul 27, 2015 at 12:47:14PM +0200, Peter Zijlstra wrote:
> > @@ -68,13 +63,8 @@ void static_key_slow_inc(struct static_k
> > return;
> >
> > jump_label_lock();
> > + if (atomic_inc_and_test(&key->enabled))
>
> atomic_inc_return() == 1, works _much_ better.
Confirmed. With this change, the jump_label_init() patch, plus the
changes in s390 inline asm everything works for me.
There are a couple of places in s390 code where the DEFINE_STATIC_KEY_FALSE
and static_branch_likely() combination would make sense.
next prev parent reply other threads:[~2015-07-28 5:54 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-07-24 17:52 [RFC][PATCH 0/7] jump_label: Another (better) static_key interface Peter Zijlstra
2015-07-24 17:52 ` [RFC][PATCH 1/7] jump_label: Rename JUMP_LABEL_{EN,DIS}ABLE Peter Zijlstra
2015-07-24 17:52 ` [RFC][PATCH 2/7] jump_label: Rename JUMP_LABEL_TYPE_* Peter Zijlstra
2015-07-24 17:52 ` [RFC][PATCH 3/7] jump_label: Add jump_entry_key() helper Peter Zijlstra
2015-07-24 17:52 ` [RFC][PATCH 4/7] jump_label: Add static_key_{en,dis}able() helpers Peter Zijlstra
2015-07-24 17:52 ` [RFC][PATCH 5/7] jump_label: Rework update logic Peter Zijlstra
2015-07-27 9:07 ` Peter Zijlstra
2015-07-27 10:47 ` Peter Zijlstra
2015-07-27 16:30 ` Peter Zijlstra
2015-07-28 5:54 ` Heiko Carstens [this message]
2015-07-24 17:52 ` [RFC][PATCH 6/7] jump_label: Add a new static_key interface Peter Zijlstra
2015-07-27 9:24 ` Peter Zijlstra
2015-07-27 9:52 ` Peter Zijlstra
2015-07-27 10:20 ` Heiko Carstens
2015-07-27 10:47 ` Peter Zijlstra
2015-07-27 10:50 ` Peter Zijlstra
2015-07-27 10:52 ` Heiko Carstens
2015-07-27 11:03 ` Peter Zijlstra
2015-07-27 14:39 ` Peter Zijlstra
2015-07-27 10:45 ` Peter Zijlstra
2015-07-27 10:51 ` Heiko Carstens
2015-07-24 17:52 ` [RFC][PATCH 7/7] x86, tsc: Employ static_branch_likely() Peter Zijlstra
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