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From: Christoph Lameter <clameter@sgi.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	Andrew Morton <akpm@osdl.org>,
	Nick Piggin <nickpiggin@yahoo.com.au>,
	Ingo Molnar <mingo@elte.hu>, Rik van Riel <riel@redhat.com>
Subject: Re: [PATCH 00/14] Concurrent Page Cache
Date: Mon, 29 Jan 2007 10:15:54 -0800 (PST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0701291013530.29254@schroedinger.engr.sgi.com> (raw)
In-Reply-To: <1170093944.6189.192.camel@twins>

On Mon, 29 Jan 2007, Peter Zijlstra wrote:

> Ladder locking would end up:
> 
> lock A0
> lock B1
> unlock A0 -> a new operation can start
> lock C2
> unlock B1
> lock D5
> unlock C2
> ** we do stuff to D5
> unlock D5
> 

Instead of taking one lock we would need to take 4? Wont doing so cause 
significant locking overhead? We probably would want to run some 
benchmarks. Maybe disable the scheme for systems with a small number of 
processors?



  reply	other threads:[~2007-01-29 18:16 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-01-28 13:13 Peter Zijlstra
2007-01-28 13:13 ` [PATCH 01/14] radix-tree: use indirect bit Peter Zijlstra
2007-01-28 13:13 ` [PATCH 02/14] radix-tree: gang_lookup_slot Peter Zijlstra
2007-01-28 13:13 ` [PATCH 03/14] radix-tree: gang_lookup_tag_slot Peter Zijlstra
2007-01-28 13:13 ` [PATCH 04/14] mm: speculative get page Peter Zijlstra
2007-01-28 13:13 ` [PATCH 05/14] mm: lockless pagecache lookups Peter Zijlstra
2007-01-28 13:13 ` [PATCH 06/14] mm: fix speculative page get preemption bug Peter Zijlstra
2007-01-28 13:13 ` [PATCH 07/14] mm: speculative find_get_pages_tag Peter Zijlstra
2007-01-28 13:13 ` [PATCH 08/14] mm: remove find_tylock_page Peter Zijlstra
2007-01-28 13:13 ` [PATCH 09/14] mm: change tree_lock into a spinlock Peter Zijlstra
2007-01-28 13:13 ` [PATCH 10/14] radix-tree: concurrent write side support Peter Zijlstra
2007-01-28 13:13 ` [PATCH 11/14] atomic_ulong_t Peter Zijlstra
2007-01-29 17:11   ` Christoph Lameter
2007-01-28 13:13 ` [PATCH 12/14] mm/fs: abstract address_space::nrpages Peter Zijlstra
2007-01-28 13:13 ` [PATCH 13/14] mm: lock_page_ref Peter Zijlstra
2007-01-28 13:13 ` [PATCH 14/14] mm: concurrent pagecache write side Peter Zijlstra
2007-01-29 17:20 ` [PATCH 00/14] Concurrent Page Cache Christoph Lameter
2007-01-29 18:05   ` Peter Zijlstra
2007-01-29 18:15     ` Christoph Lameter [this message]
2007-01-29 18:56       ` Peter Zijlstra

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