From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Fengguang Wu <fengguang.wu@intel.com>,
David Cohen <david.a.cohen@linux.intel.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Damien Ramonda <damien.ramonda@intel.com>,
Jan Kara <jack@suse.cz>, Linus <torvalds@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local memory and limit readahead pages
Date: Mon, 03 Feb 2014 14:00:45 +0530 [thread overview]
Message-ID: <52EF53B5.6050203@linux.vnet.ibm.com> (raw)
In-Reply-To: <1390388025-1418-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com>
On 01/22/2014 04:23 PM, Raghavendra K T wrote:
> max_sane_readahead returns zero on the cpu having no local memory
> node. Fix that by returning a sanitized number of pages viz.,
> minimum of (requested pages, 4k)
>
> Result:
> fadvise experiment with FADV_WILLNEED on a x240 machine with 1GB testfile
> 32GB* 4G RAM numa machine ( 12 iterations) yielded
>
> Kernel Avg Stddev
> base 7.2963 1.10 %
> patched 7.2972 1.18 %
>
> Reviewed-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
> ---
Could you please let me know what do you feel about the patch ?
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WARNING: multiple messages have this Message-ID (diff)
From: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Fengguang Wu <fengguang.wu@intel.com>,
David Cohen <david.a.cohen@linux.intel.com>,
Al Viro <viro@zeniv.linux.org.uk>,
Damien Ramonda <damien.ramonda@intel.com>,
Jan Kara <jack@suse.cz>, Linus <torvalds@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [RFC PATCH V5] mm readahead: Fix readahead fail for no local memory and limit readahead pages
Date: Mon, 03 Feb 2014 14:00:45 +0530 [thread overview]
Message-ID: <52EF53B5.6050203@linux.vnet.ibm.com> (raw)
In-Reply-To: <1390388025-1418-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com>
On 01/22/2014 04:23 PM, Raghavendra K T wrote:
> max_sane_readahead returns zero on the cpu having no local memory
> node. Fix that by returning a sanitized number of pages viz.,
> minimum of (requested pages, 4k)
>
> Result:
> fadvise experiment with FADV_WILLNEED on a x240 machine with 1GB testfile
> 32GB* 4G RAM numa machine ( 12 iterations) yielded
>
> Kernel Avg Stddev
> base 7.2963 1.10 %
> patched 7.2972 1.18 %
>
> Reviewed-by: Jan Kara <jack@suse.cz>
> Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
> ---
Could you please let me know what do you feel about the patch ?
next prev parent reply other threads:[~2014-02-03 8:24 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-22 10:53 [RFC PATCH V5] mm readahead: Fix readahead fail for no local memory and limit readahead pages Raghavendra K T
2014-01-22 10:53 ` Raghavendra K T
2014-02-03 8:30 ` Raghavendra K T [this message]
2014-02-03 8:30 ` Raghavendra K T
2014-02-06 22:51 ` Andrew Morton
2014-02-06 22:51 ` Andrew Morton
2014-02-06 22:58 ` David Rientjes
2014-02-06 22:58 ` David Rientjes
2014-02-06 23:22 ` Andrew Morton
2014-02-06 23:22 ` Andrew Morton
2014-02-06 23:48 ` David Rientjes
2014-02-06 23:48 ` David Rientjes
2014-02-06 23:58 ` David Rientjes
2014-02-06 23:58 ` David Rientjes
2014-02-07 10:42 ` Raghavendra K T
2014-02-07 10:42 ` Raghavendra K T
2014-02-07 20:41 ` David Rientjes
2014-02-07 20:41 ` David Rientjes
2014-02-10 8:21 ` Raghavendra K T
2014-02-10 8:21 ` Raghavendra K T
2014-02-10 10:05 ` David Rientjes
2014-02-10 10:05 ` David Rientjes
2014-02-10 12:25 ` Raghavendra K T
2014-02-10 12:25 ` Raghavendra K T
2014-02-10 21:35 ` David Rientjes
2014-02-10 21:35 ` David Rientjes
2014-02-13 7:07 ` Raghavendra K T
2014-02-13 7:07 ` Raghavendra K T
2014-02-13 8:05 ` David Rientjes
2014-02-13 8:05 ` David Rientjes
2014-02-13 10:04 ` Raghavendra K T
2014-02-13 10:04 ` Raghavendra K T
2014-02-13 22:41 ` David Rientjes
2014-02-13 22:41 ` David Rientjes
2014-02-14 0:14 ` Nishanth Aravamudan
2014-02-14 0:14 ` Nishanth Aravamudan
2014-02-14 0:37 ` Linus Torvalds
2014-02-14 0:37 ` Linus Torvalds
2014-02-14 0:45 ` Andrew Morton
2014-02-14 0:45 ` Andrew Morton
2014-02-14 4:32 ` Nishanth Aravamudan
2014-02-14 4:32 ` Nishanth Aravamudan
2014-02-14 10:54 ` David Rientjes
2014-02-14 10:54 ` David Rientjes
2014-02-17 19:28 ` Nishanth Aravamudan
2014-02-17 19:28 ` Nishanth Aravamudan
2014-02-17 23:14 ` David Rientjes
2014-02-17 23:14 ` David Rientjes
2014-02-18 1:31 ` Nishanth Aravamudan
2014-02-18 1:31 ` Nishanth Aravamudan
2014-02-17 22:59 ` Linus Torvalds
2014-02-17 22:59 ` Linus Torvalds
2014-02-14 7:43 ` Jan Kara
2014-02-14 7:43 ` Jan Kara
2014-02-17 22:57 ` Linus Torvalds
2014-02-17 22:57 ` Linus Torvalds
2014-02-14 5:47 ` Nishanth Aravamudan
2014-02-14 5:47 ` Nishanth Aravamudan
2014-02-13 21:06 ` Andrew Morton
2014-02-13 21:06 ` Andrew Morton
2014-02-13 21:42 ` Nishanth Aravamudan
2014-02-13 21:42 ` Nishanth Aravamudan
2014-02-10 8:29 ` [RFC PATCH V5 RESEND] " Raghavendra K T
2014-02-10 8:29 ` Raghavendra K T
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