From: Huang Shijie <shijie8@gmail.com>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Minchan Kim <minchan.kim@gmail.com>,
akpm@linux-foundation.org, mel@csn.ul.ie, linux-mm@kvack.org
Subject: Re: [PATCH] page allocator: fix update NR_FREE_PAGES only as necessary
Date: Mon, 04 Jan 2010 14:11:51 +0800 [thread overview]
Message-ID: <4B4186A7.5080402@gmail.com> (raw)
In-Reply-To: <20100104144332.96A2.A69D9226@jp.fujitsu.com>
> Why can't we write following? __mod_zone_page_state() only require irq
> disabling, it doesn't need spin lock. I think.
>
>
>
struct per_cpu_pageset {
.................................................
#ifdef CONFIG_SMP
s8 stat_threshold;
s8 vm_stat_diff[NR_VM_ZONE_STAT_ITEMS];
#endif
} ____cacheline_aligned_in_smp;
The field 'stat_threshold' is in the CONFIG_SMP macro, does it not need
the spinlock? I will read the code more carefully.
I saw the macro, so I thought it need the spinlock. :)
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next prev parent reply other threads:[~2010-01-04 6:13 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-04 2:22 [PATCH] mm : add check for the return value Huang Shijie
2010-01-04 3:21 ` Minchan Kim
2010-01-04 4:10 ` shijie8
2010-01-04 4:48 ` Minchan Kim
2010-01-04 5:18 ` Huang Shijie
2010-01-04 6:06 ` Minchan Kim
2010-01-08 22:59 ` Andrew Morton
2010-01-04 5:52 ` [PATCH] page allocator: fix update NR_FREE_PAGES only as necessary KOSAKI Motohiro
2010-01-04 6:03 ` Minchan Kim
2010-01-04 6:11 ` Huang Shijie [this message]
2010-01-04 6:16 ` KOSAKI Motohiro
2010-01-04 9:35 ` Huang Shijie
2010-01-05 7:24 ` KOSAKI Motohiro
2010-01-04 9:58 ` Mel Gorman
2010-01-04 17:46 ` Christoph Lameter
2010-01-05 1:08 ` KOSAKI Motohiro
2010-01-08 23:02 ` Andrew Morton
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