From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Paul McKenney <paul.mckenney@us.ibm.com>,
Dipankar Sarma <dipankar@in.ibm.com>, Ingo Molnar <mingo@elte.hu>,
linux-kernel <linux-kernel@vger.kernel.org>
Subject: [patch 0/7] lockless pagecache 2
Date: Thu, 11 Aug 2005 22:18:09 +1000 [thread overview]
Message-ID: <42FB4201.7080304@yahoo.com.au> (raw)
This is my second attempt at a lockless pagecache.
Patches are against 2.6.13-rc6, and have had reasonable
stressing (albeit on small SMPs).
Main changes since last seen:
* Code clarity and commenting improvement.
* Fix race where multiple concurrent failed speculative
reference takers could be confused into thinking a free
page wasn't free, due to the elevated refcounts.
* Convert radix tree node freeing over to RCU. I completely
missed this problem in my first attempt. (My first real
RCU attempt - completely wrong?).
* page_cache_get_speculative previously used only preempt_
disable to stop the current CPU from entering the page
allocator. Needs to turn off interrupts too.
Paul picked this bug up without seeing the code, just a
vague description of what I was trying to do. All I
picked up was my jaw from the ground ;)
--
SUSE Labs, Novell Inc.
Send instant messages to your online friends http://au.messenger.yahoo.com
next reply other threads:[~2005-08-11 12:18 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-08-11 12:18 Nick Piggin [this message]
2005-08-11 12:21 ` [patch 1/7] mm: remove PageReserved rollup Nick Piggin
2005-08-11 12:22 ` [patch 2/7] mm: PG_free flag Nick Piggin
2005-08-11 12:22 ` [patch 3/7] mm: speculative get_page Nick Piggin
2005-08-11 12:25 ` [patch 4/7] radix-tree: lookup_slot Nick Piggin
2005-08-11 12:25 ` [patch 5/7] radix-tree: lockless readside Nick Piggin
2005-08-11 12:28 ` [patch 6/7] mm: lockless pagecache Nick Piggin
2005-08-11 12:28 ` [patch 7/7] mm: spinlock tree_lock Nick Piggin
2005-08-11 13:58 ` [patch 6/7] mm: lockless pagecache Pekka Enberg
2005-08-11 14:06 ` Nick Piggin
2005-08-12 1:49 ` Paul E. McKenney
2005-08-12 4:04 ` Nick Piggin
2005-08-12 1:37 ` [patch 5/7] radix-tree: lockless readside Paul E. McKenney
2005-08-12 3:59 ` Nick Piggin
2005-08-12 4:38 ` Nick Piggin
2005-08-12 7:53 ` Nick Piggin
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