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From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: linux-ia64@vger.kernel.org, avagin@virtuozzo.com,
	peterz@infradead.org, hpa@zytor.com, gorcunov@virtuozzo.com,
	linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
	x86@kernel.org, mingo@redhat.com, mattst88@gmail.com,
	fenghua.yu@intel.com, arnd@arndb.de, ink@jurassic.park.msu.ru,
	tglx@linutronix.de, rth@twiddle.net, tony.luck@intel.com,
	linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
	schwidefsky@de.ibm.com, davem@davemloft.net, rientjes@google.com,
	viro@zeniv.linux.org.uk
Subject: Re: [PATCH REBASED 3/6] s390: Add __down_read_killable()
Date: Sat, 30 Sep 2017 11:20:02 +0200	[thread overview]
Message-ID: <20170930092002.GA4623@osiris> (raw)
In-Reply-To: <150670117817.23930.13068785028558453848.stgit@localhost.localdomain>

On Fri, Sep 29, 2017 at 07:06:18PM +0300, Kirill Tkhai wrote:
> Similar to __down_write_killable(), and read killable primitive.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> ---
>  arch/s390/include/asm/rwsem.h |   18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h

FWIW, while looking into this patch I realized that we never optimized our
rwsem primitives to make use of new atomic instructions.

The generic rwsem header file however does, since it uses atomic ops which
we did optimize. Even when compiling for old machines the generic version
generates better code. Therefore I will remove the 15 years old s390
implementation and switch to the generic version instead.

The same might be true for alpha and ia64...

WARNING: multiple messages have this Message-ID (diff)
From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: linux-ia64@vger.kernel.org, avagin@virtuozzo.com,
	peterz@infradead.org, hpa@zytor.com, gorcunov@virtuozzo.com,
	linux-arch@vger.kernel.org, linux-s390@vger.kernel.org,
	x86@kernel.org, mingo@redhat.com, mattst88@gmail.com,
	fenghua.yu@intel.com, arnd@arndb.de, ink@jurassic.park.msu.ru,
	tglx@linutronix.de, rth@twiddle.net, tony.luck@intel.com,
	linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org,
	schwidefsky@de.ibm.com, davem@davemloft.net, rientjes@google.com,
	viro@zeniv.linux.org.uk
Subject: Re: [PATCH REBASED 3/6] s390: Add __down_read_killable()
Date: Sat, 30 Sep 2017 09:20:02 +0000	[thread overview]
Message-ID: <20170930092002.GA4623@osiris> (raw)
In-Reply-To: <150670117817.23930.13068785028558453848.stgit@localhost.localdomain>

On Fri, Sep 29, 2017 at 07:06:18PM +0300, Kirill Tkhai wrote:
> Similar to __down_write_killable(), and read killable primitive.
> 
> Signed-off-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> ---
>  arch/s390/include/asm/rwsem.h |   18 ++++++++++++++++--
>  1 file changed, 16 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/s390/include/asm/rwsem.h b/arch/s390/include/asm/rwsem.h

FWIW, while looking into this patch I realized that we never optimized our
rwsem primitives to make use of new atomic instructions.

The generic rwsem header file however does, since it uses atomic ops which
we did optimize. Even when compiling for old machines the generic version
generates better code. Therefore I will remove the 15 years old s390
implementation and switch to the generic version instead.

The same might be true for alpha and ia64...


  reply	other threads:[~2017-09-30  9:20 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-09-29 16:05 [PATCH REBASED 0/6] rwsem: Implement down_read_killable() Kirill Tkhai
2017-09-29 16:05 ` Kirill Tkhai
2017-09-29 16:05 ` [PATCH REBASED 1/6] alpha: Add __down_read_killable() Kirill Tkhai
2017-09-29 16:05   ` Kirill Tkhai
2017-10-10 11:03   ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 2/6] ia64: " Kirill Tkhai
2017-09-29 16:06   ` Kirill Tkhai
2017-10-10 11:04   ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 3/6] s390: " Kirill Tkhai
2017-09-29 16:06   ` Kirill Tkhai
2017-09-30  9:20   ` Heiko Carstens [this message]
2017-09-30  9:20     ` Heiko Carstens
2017-09-30 10:36     ` Martin Schwidefsky
2017-09-30 10:36       ` Martin Schwidefsky
2017-09-30 10:38       ` Heiko Carstens
2017-09-30 10:38         ` Heiko Carstens
2017-09-30 10:39       ` Martin Schwidefsky
2017-09-30 10:39         ` Martin Schwidefsky
2017-10-10 11:04   ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 4/6] x86: " Kirill Tkhai
2017-09-29 16:06   ` Kirill Tkhai
2017-10-10 11:05   ` [tip:locking/core] locking/arch, " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 5/6] rwsem: Add down_read_killable() Kirill Tkhai
2017-09-29 16:06   ` Kirill Tkhai
2017-10-10 11:05   ` [tip:locking/core] locking/rwsem: " tip-bot for Kirill Tkhai
2017-09-29 16:06 ` [PATCH REBASED 6/6] fs: Use killable down_read() in iterate_dir() Kirill Tkhai
2017-09-29 16:06   ` Kirill Tkhai
2017-09-29 16:06   ` Kirill Tkhai
2017-10-10 11:05   ` [tip:locking/core] locking/rwsem, " tip-bot for Kirill Tkhai
2017-10-03  9:03 ` [PATCH REBASED 0/6] rwsem: Implement down_read_killable() Peter Zijlstra
2017-10-03  9:03   ` Peter Zijlstra

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