From: lauraa@codeaurora.org (Laura Abbott)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 3/4] mm/vmalloc.c: Allow lowmem to be tracked in vmalloc
Date: Mon, 02 Dec 2013 20:59:43 -0800 [thread overview]
Message-ID: <529D653F.3090401@codeaurora.org> (raw)
In-Reply-To: <20131126144541.6b16979b77f927f6d945ab60@linux-foundation.org>
On 11/26/2013 2:45 PM, Andrew Morton wrote:
> So yes, it would be prudent to be worried about is_vmalloc_addr()
> performance at the outset.
>
> Couldn't is_vmalloc_addr() just be done with a plain old bitmap? It
> would consume 128kbytes to manage a 4G address space, and 1/8th of a meg
> isn't much.
>
Yes, I came to the same conclusion after realizing I needed something
similar to fix up proc/kcore.c . I plan to go with the bitmap for the
next patch version.
Laura
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
WARNING: multiple messages have this Message-ID (diff)
From: Laura Abbott <lauraa@codeaurora.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Dave Hansen <dave@sr71.net>,
linux-arm-kernel@lists.infradead.org, linux-mm@kvack.org,
Neeti Desai <neetid@codeaurora.org>
Subject: Re: [RFC PATCH 3/4] mm/vmalloc.c: Allow lowmem to be tracked in vmalloc
Date: Mon, 02 Dec 2013 20:59:43 -0800 [thread overview]
Message-ID: <529D653F.3090401@codeaurora.org> (raw)
In-Reply-To: <20131126144541.6b16979b77f927f6d945ab60@linux-foundation.org>
On 11/26/2013 2:45 PM, Andrew Morton wrote:
> So yes, it would be prudent to be worried about is_vmalloc_addr()
> performance at the outset.
>
> Couldn't is_vmalloc_addr() just be done with a plain old bitmap? It
> would consume 128kbytes to manage a 4G address space, and 1/8th of a meg
> isn't much.
>
Yes, I came to the same conclusion after realizing I needed something
similar to fix up proc/kcore.c . I plan to go with the bitmap for the
next patch version.
Laura
--
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation
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next prev parent reply other threads:[~2013-12-03 4:59 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-11 23:26 [RFC 0/4] Intermix Lowmem and vmalloc Laura Abbott
2013-11-11 23:26 ` Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 1/4] arm: mm: Add iotable_init_novmreserve Laura Abbott
2013-11-11 23:26 ` Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 2/4] arm: mm: Track lowmem in vmalloc Laura Abbott
2013-11-11 23:26 ` Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 3/4] mm/vmalloc.c: Allow lowmem to be tracked " Laura Abbott
2013-11-11 23:26 ` Laura Abbott
2013-11-11 23:37 ` Kyungmin Park
2013-11-11 23:37 ` Kyungmin Park
2013-11-12 1:23 ` Laura Abbott
2013-11-12 1:23 ` Laura Abbott
2013-11-14 17:45 ` Dave Hansen
2013-11-14 17:45 ` Dave Hansen
2013-11-15 4:52 ` Laura Abbott
2013-11-15 4:52 ` Laura Abbott
2013-11-15 15:53 ` Dave Hansen
2013-11-15 15:53 ` Dave Hansen
2013-11-26 22:45 ` Andrew Morton
2013-11-26 22:45 ` Andrew Morton
2013-12-03 4:59 ` Laura Abbott [this message]
2013-12-03 4:59 ` Laura Abbott
2013-11-11 23:26 ` [RFC PATCH 4/4] mm/vmalloc.c: Treat the entire kernel virtual space as vmalloc Laura Abbott
2013-11-11 23:26 ` Laura Abbott
2013-11-14 17:26 ` Dave Hansen
2013-11-14 17:26 ` Dave Hansen
2013-11-15 5:34 ` Laura Abbott
2013-11-15 5:34 ` Laura Abbott
2013-11-12 0:13 ` [RFC 0/4] Intermix Lowmem and vmalloc Russell King - ARM Linux
2013-11-12 0:13 ` Russell King - ARM Linux
2013-11-12 1:24 ` Laura Abbott
2013-11-12 1:24 ` Laura Abbott
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