From: Jeffrey Hundstad <jeffrey.hundstad@mnsu.edu>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Steven Barrett <damentz@liquorix.net>,
Ben Gamari <bgamari.foss@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Nick Piggin <npiggin@kernel.dk>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH v6 0/4] fadvise(DONTNEED) support
Date: Tue, 22 Feb 2011 11:03:51 -0600 [thread overview]
Message-ID: <4D63EC77.6070208@mnsu.edu> (raw)
In-Reply-To: <20110222132804.GQ13092@random.random>
On 02/22/2011 07:28 AM, Andrea Arcangeli wrote:
> Hi Minchan,
> That's my point, we should check if the "thrashing horribly" is really
> a "recently" or if it has always happened before with 2.6.18 and previous.
I would bet that "thrashing" isn't what he meant. He almost certainly
meant "needless I/O" and nothing to do with swapping. I've seen this
similar report before. This report is almost always gets answered with
a "set your swappiness to an appropriate value" type answer. Or a "your
userspace app needs to get smarter" type answer. I think they are
trying to do the latter, but need some help from the kernel, and that's
what they're trying to do here.
--
Jeffrey Hundstad
WARNING: multiple messages have this Message-ID (diff)
From: Jeffrey Hundstad <jeffrey.hundstad@mnsu.edu>
To: Andrea Arcangeli <aarcange@redhat.com>
Cc: Minchan Kim <minchan.kim@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm <linux-mm@kvack.org>,
LKML <linux-kernel@vger.kernel.org>,
Steven Barrett <damentz@liquorix.net>,
Ben Gamari <bgamari.foss@gmail.com>,
Peter Zijlstra <peterz@infradead.org>,
Rik van Riel <riel@redhat.com>, Mel Gorman <mel@csn.ul.ie>,
KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>,
Wu Fengguang <fengguang.wu@intel.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Nick Piggin <npiggin@kernel.dk>,
Balbir Singh <balbir@linux.vnet.ibm.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Subject: Re: [PATCH v6 0/4] fadvise(DONTNEED) support
Date: Tue, 22 Feb 2011 11:03:51 -0600 [thread overview]
Message-ID: <4D63EC77.6070208@mnsu.edu> (raw)
In-Reply-To: <20110222132804.GQ13092@random.random>
On 02/22/2011 07:28 AM, Andrea Arcangeli wrote:
> Hi Minchan,
> That's my point, we should check if the "thrashing horribly" is really
> a "recently" or if it has always happened before with 2.6.18 and previous.
I would bet that "thrashing" isn't what he meant. He almost certainly
meant "needless I/O" and nothing to do with swapping. I've seen this
similar report before. This report is almost always gets answered with
a "set your swappiness to an appropriate value" type answer. Or a "your
userspace app needs to get smarter" type answer. I think they are
trying to do the latter, but need some help from the kernel, and that's
what they're trying to do here.
--
Jeffrey Hundstad
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next prev parent reply other threads:[~2011-02-22 17:29 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-20 14:43 [PATCH v6 0/4] fadvise(DONTNEED) support Minchan Kim
2011-02-20 14:43 ` Minchan Kim
2011-02-20 14:43 ` [PATCH v6 1/3] deactivate invalidated pages Minchan Kim
2011-02-20 14:43 ` Minchan Kim
2011-02-21 8:29 ` Johannes Weiner
2011-02-21 8:29 ` Johannes Weiner
2011-02-20 14:43 ` [PATCH v6 2/3] memcg: move memcg reclaimable page into tail of inactive list Minchan Kim
2011-02-20 14:43 ` Minchan Kim
2011-02-21 8:40 ` Johannes Weiner
2011-02-21 8:40 ` Johannes Weiner
2011-02-21 14:07 ` Minchan Kim
2011-02-21 14:07 ` Minchan Kim
2011-02-21 15:59 ` Minchan Kim
2011-02-21 15:59 ` Minchan Kim
2011-02-21 16:06 ` Johannes Weiner
2011-02-21 16:06 ` Johannes Weiner
2011-03-28 12:51 ` [PATCH] memcg: fix mem_cgroup_rotate_reclaimable_page Eric Dumazet
2011-03-28 12:51 ` Eric Dumazet
2011-03-28 13:45 ` Minchan Kim
2011-03-28 13:45 ` Minchan Kim
2011-02-20 14:43 ` [PATCH v6 3/3] Reclaim invalidated page ASAP Minchan Kim
2011-02-20 14:43 ` Minchan Kim
2011-02-21 19:07 ` [PATCH v6 0/4] fadvise(DONTNEED) support Andrea Arcangeli
2011-02-21 19:07 ` Andrea Arcangeli
2011-02-21 22:59 ` Minchan Kim
2011-02-21 22:59 ` Minchan Kim
2011-02-22 13:28 ` Andrea Arcangeli
2011-02-22 13:28 ` Andrea Arcangeli
2011-02-22 14:26 ` Minchan Kim
2011-02-22 14:26 ` Minchan Kim
2011-02-22 14:46 ` Andrea Arcangeli
2011-02-22 14:46 ` Andrea Arcangeli
2011-02-22 17:03 ` Jeffrey Hundstad [this message]
2011-02-22 17:03 ` Jeffrey Hundstad
2011-02-22 17:11 ` Andrea Arcangeli
2011-02-22 17:11 ` Andrea Arcangeli
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