From: William Lee Irwin III <wli@holomorphy.com>
To: linux-kernel@vger.kernel.org
Subject: Re: [PATCH] Scalable page cache - take two
Date: Sun, 23 Dec 2001 16:28:39 -0800 [thread overview]
Message-ID: <20011223162839.B750@holomorphy.com> (raw)
In-Reply-To: <87bsgp7fcq.fsf@fadata.bg>
In-Reply-To: <87bsgp7fcq.fsf@fadata.bg>; from velco@fadata.bg on Mon, Dec 24, 2001 at 12:15:33AM +0200
On Mon, Dec 24, 2001 at 12:15:33AM +0200, Momchil Velikov wrote:
> This is the second mutation of the scalable page cache patch. It:
>
> - removes the global page cache hash table and the associated lock
>
> - implements the page cache as a per mapping radix tree. This
> increases the size of ``struct inode'' by 8 bytes (in 32bit
> ports). The branch factor is a compile time constant
> ``RAD_MAP_SHIFT'' (currently 7, 128 pointers)
>
> - decreases the size of ``struct page'' by removing
> ``next_hash'' and ``pprev_hash' fields as they are no longer
> needed for the page cache. NOTE that this curently breaks
> sparc64 and arm ports. The sparc64 port is trivialy fixable.
>
> The patch is stable on UP (survives make -j6) and does not have
> noticeable performance impact (at least for the kernel compile
> benchmark) in either direction.
Beautiful programming!
Cheers,
Bill
next prev parent reply other threads:[~2001-12-24 0:29 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-12-23 22:15 [PATCH] Scalable page cache - take two Momchil Velikov
2001-12-24 0:28 ` William Lee Irwin III [this message]
2001-12-24 0:52 ` Anton Blanchard
2001-12-27 6:15 ` Daniel Phillips
2001-12-24 17:08 ` Heinz Diehl
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