From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <dahi@linux.vnet.ibm.com>,
Russell King <linux@arm.linux.org.uk>,
lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>
Subject: Re: kmap_atomic and preemption
Date: Wed, 4 May 2016 15:53:45 +0200 [thread overview]
Message-ID: <20160504155345.5fdd366e@free-electrons.com> (raw)
In-Reply-To: <20160504134729.GP3430@twins.programming.kicks-ass.net>
Hello,
On Wed, 4 May 2016 15:47:29 +0200, Peter Zijlstra wrote:
> static inline void *kmap_atomic(struct page *page)
> {
> preempt_disable();
> pagefault_disable();
> if (!PageHighMem(page))
> return page_address(page);
>
> return __kmap_atomic(page);
> }
This is essentially what has been done on ARM in commit
9ff0bb5ba60638a688a46e93df8c5009896672eb, showing a pretty significant
improvement in network workloads.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
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WARNING: multiple messages have this Message-ID (diff)
From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Vineet Gupta <Vineet.Gupta1@synopsys.com>,
Nicolas Pitre <nicolas.pitre@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
David Hildenbrand <dahi@linux.vnet.ibm.com>,
Russell King <linux@arm.linux.org.uk>,
lkml <linux-kernel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org>
Subject: Re: kmap_atomic and preemption
Date: Wed, 4 May 2016 15:53:45 +0200 [thread overview]
Message-ID: <20160504155345.5fdd366e@free-electrons.com> (raw)
Message-ID: <20160504135345.SpzdxHJ-QzhjJMq29R4mDdgiAO6huTzWtTKhSSzafO8@z> (raw)
In-Reply-To: <20160504134729.GP3430@twins.programming.kicks-ass.net>
Hello,
On Wed, 4 May 2016 15:47:29 +0200, Peter Zijlstra wrote:
> static inline void *kmap_atomic(struct page *page)
> {
> preempt_disable();
> pagefault_disable();
> if (!PageHighMem(page))
> return page_address(page);
>
> return __kmap_atomic(page);
> }
This is essentially what has been done on ARM in commit
9ff0bb5ba60638a688a46e93df8c5009896672eb, showing a pretty significant
improvement in network workloads.
Best regards,
Thomas
--
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com
next prev parent reply other threads:[~2016-05-04 13:53 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-04 10:37 kmap_atomic and preemption Vineet Gupta
2016-05-04 10:37 ` Vineet Gupta
2016-05-04 13:47 ` Peter Zijlstra
2016-05-04 13:47 ` Peter Zijlstra
2016-05-04 13:53 ` Thomas Petazzoni [this message]
2016-05-04 13:53 ` Thomas Petazzoni
2016-05-04 14:01 ` Vineet Gupta
2016-05-04 14:01 ` Vineet Gupta
2016-05-04 14:16 ` Vineet Gupta
2016-05-04 14:16 ` Vineet Gupta
2016-05-04 15:01 ` Peter Zijlstra
2016-05-04 15:01 ` Peter Zijlstra
2016-05-05 12:37 ` Vineet Gupta
2016-05-05 12:37 ` Vineet Gupta
2016-05-04 19:17 ` Russell King - ARM Linux
2016-05-04 19:17 ` Russell King - ARM Linux
2016-05-05 9:37 ` Peter Zijlstra
2016-05-05 9:37 ` Peter Zijlstra
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