From: "Jörn Engel" <joern@logfs.org>
To: Dave Kleikamp <shaggy@linux.vnet.ibm.com>
Cc: linux-mm <linux-mm@kvack.org>
Subject: Re: [RFC:PATCH 00/07] VM File Tails
Date: Wed, 29 Aug 2007 23:31:54 +0200 [thread overview]
Message-ID: <20070829213154.GB29635@lazybastard.org> (raw)
In-Reply-To: <20070829205325.28328.67953.sendpatchset@norville.austin.ibm.com>
On Wed, 29 August 2007 16:53:25 -0400, Dave Kleikamp wrote:
>
> - benchmark!
I'd love to know how much difference this makes. Basically four
numbers:
- number of address spaces
- bytes allocated for file tails
- number of pages allocated for non-tail storage
- number of pages allocated for tail storage
With those it should be possible to calculate how much is saved by using
tail and how much is wasted by having both tails and a page. Putting
this in relation to the total amount of data in page cache is
interesting as well.
While not as decisive as benchmarks it may give some indication why
certain workloads benefit or suffer.
JA?rn
--
The rabbit runs faster than the fox, because the rabbit is rinning for
his life while the fox is only running for his dinner.
-- Aesop
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next prev parent reply other threads:[~2007-08-29 21:31 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-08-29 20:53 Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 01/07] Add tail to address space Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 02/07] Core function for packing, unpacking, and freeing file tails Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 03/07] Release tail when inode is freed Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 04/07] Unpack or remove file tail when inode is resized Dave Kleikamp
2007-08-29 20:53 ` [RFC:PATCH 05/07] find_get_page() and find_lock_page() need to unpack the tail Dave Kleikamp
2007-08-29 20:54 ` [RFC:PATCH 06/07] For readahead, leave data in tail Dave Kleikamp
2007-08-29 20:54 ` [RFC:PATCH 07/07] shrink_active_list: pack file tails rather than move to inactive list Dave Kleikamp
2007-08-29 21:31 ` Jörn Engel [this message]
2007-08-29 21:45 ` [RFC:PATCH 00/07] VM File Tails Dave Kleikamp
2007-08-29 23:38 ` Jörn Engel
2007-08-30 2:15 ` Dave Kleikamp
2007-08-30 10:11 ` Jörn Engel
2007-08-31 21:00 ` Luiz Fernando N. Capitulino
2007-08-31 21:47 ` Dave Kleikamp
2007-09-03 21:09 ` Luiz Fernando N. Capitulino
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