From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Thomas Hellstrom <thomas@tungstengraphics.com>
Cc: Nick Piggin <npiggin@suse.de>, Andrew Morton <akpm@osdl.org>,
Linux Memory Management <linux-mm@kvack.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch 3/3] mm: fault handler to replace nopage and populate
Date: Tue, 10 Oct 2006 06:45:13 +1000 [thread overview]
Message-ID: <1160426713.7752.6.camel@localhost.localdomain> (raw)
In-Reply-To: <452A50C2.9050409@tungstengraphics.com>
> Wouldn't that confuse concurrent readers?
>
> Could it be an option to make it safe for the fault handler to
> temporarily drop the mmap_sem read lock given that some conditions TBD
> are met?
> In that case it can retake the mmap_sem write lock, do the VMA flags
> modifications, downgrade and do the pte modifications using a helper, or
> even use remap_pfn_range() during the time the write lock is held?
If we return NOPAGE_REFAULT, then yes, we can drop the mmap sem, though
I 'm not sure we need that...
Ben.
WARNING: multiple messages have this Message-ID (diff)
From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Thomas Hellstrom <thomas@tungstengraphics.com>
Cc: Nick Piggin <npiggin@suse.de>, Andrew Morton <akpm@osdl.org>,
Linux Memory Management <linux-mm@kvack.org>,
Linux Kernel <linux-kernel@vger.kernel.org>
Subject: Re: [patch 3/3] mm: fault handler to replace nopage and populate
Date: Tue, 10 Oct 2006 06:45:13 +1000 [thread overview]
Message-ID: <1160426713.7752.6.camel@localhost.localdomain> (raw)
In-Reply-To: <452A50C2.9050409@tungstengraphics.com>
> Wouldn't that confuse concurrent readers?
>
> Could it be an option to make it safe for the fault handler to
> temporarily drop the mmap_sem read lock given that some conditions TBD
> are met?
> In that case it can retake the mmap_sem write lock, do the VMA flags
> modifications, downgrade and do the pte modifications using a helper, or
> even use remap_pfn_range() during the time the write lock is held?
If we return NOPAGE_REFAULT, then yes, we can drop the mmap sem, though
I 'm not sure we need that...
Ben.
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next prev parent reply other threads:[~2006-10-09 20:46 UTC|newest]
Thread overview: 98+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-07 13:05 [rfc] 2.6.19-rc1: vm stuff Nick Piggin
2006-10-07 13:05 ` Nick Piggin
2006-10-07 13:05 ` [patch 1/3] mm: arch_free_page fix Nick Piggin
2006-10-07 13:05 ` Nick Piggin
2006-10-07 13:05 ` [patch 2/3] mm: locks_freed fix Nick Piggin
2006-10-07 13:05 ` Nick Piggin
2006-10-07 13:06 ` [patch 3/3] mm: add arch_alloc_page Nick Piggin
2006-10-07 13:06 ` Nick Piggin
2006-10-07 20:43 ` Andrew Morton
2006-10-07 20:43 ` Andrew Morton
2006-10-08 1:39 ` Nick Piggin
2006-10-08 1:39 ` Nick Piggin
2006-10-11 14:48 ` Martin Schwidefsky
2006-10-11 14:48 ` Martin Schwidefsky
2006-10-11 14:56 ` Nick Piggin
2006-10-11 14:56 ` Nick Piggin
2006-10-11 15:07 ` Martin Schwidefsky
2006-10-11 15:07 ` Martin Schwidefsky
2006-10-07 13:06 ` [patch 1/3] mm: fault vs invalidate/truncate check Nick Piggin
2006-10-07 13:06 ` Nick Piggin
2006-10-07 13:06 ` [patch 2/3] mm: fault vs invalidate/truncate race fix Nick Piggin
2006-10-07 13:06 ` Nick Piggin
2006-10-07 20:43 ` Andrew Morton
2006-10-07 20:43 ` Andrew Morton
2006-10-07 20:44 ` Andrew Morton
2006-10-07 20:44 ` Andrew Morton
2006-10-08 2:05 ` Nick Piggin
2006-10-08 2:05 ` Nick Piggin
2006-10-07 13:06 ` [patch 3/3] mm: fault handler to replace nopage and populate Nick Piggin
2006-10-07 13:06 ` Nick Piggin
2006-10-07 15:14 ` Jeff Garzik
2006-10-07 15:14 ` Jeff Garzik
2006-10-08 2:17 ` Nick Piggin
2006-10-08 2:17 ` Nick Piggin
2006-10-07 20:44 ` Andrew Morton
2006-10-07 20:44 ` Andrew Morton
2006-10-08 2:12 ` Nick Piggin
2006-10-08 2:12 ` Nick Piggin
2006-10-08 23:46 ` Benjamin Herrenschmidt
2006-10-08 23:46 ` Benjamin Herrenschmidt
2006-10-09 10:26 ` Nick Piggin
2006-10-09 10:26 ` Nick Piggin
2006-10-09 10:50 ` Benjamin Herrenschmidt
2006-10-09 10:50 ` Benjamin Herrenschmidt
2006-10-09 11:00 ` Nick Piggin
2006-10-09 11:00 ` Nick Piggin
2006-10-09 11:10 ` Benjamin Herrenschmidt
2006-10-09 11:10 ` Benjamin Herrenschmidt
2006-10-09 11:19 ` Nick Piggin
2006-10-09 11:19 ` Nick Piggin
2006-10-09 11:32 ` Benjamin Herrenschmidt
2006-10-09 11:32 ` Benjamin Herrenschmidt
2006-10-09 11:45 ` Nick Piggin
2006-10-09 11:45 ` Nick Piggin
2006-10-09 11:49 ` Benjamin Herrenschmidt
2006-10-09 11:49 ` Benjamin Herrenschmidt
2006-10-09 11:58 ` Nick Piggin
2006-10-09 11:58 ` Nick Piggin
2006-10-09 12:07 ` Benjamin Herrenschmidt
2006-10-09 12:07 ` Benjamin Herrenschmidt
2006-10-09 12:14 ` Nick Piggin
2006-10-09 12:14 ` Nick Piggin
2006-10-09 13:38 ` Thomas Hellstrom
2006-10-09 13:38 ` Thomas Hellstrom
2006-10-09 13:52 ` Nick Piggin
2006-10-09 13:52 ` Nick Piggin
2006-10-09 20:50 ` Benjamin Herrenschmidt
2006-10-09 20:50 ` Benjamin Herrenschmidt
2006-10-10 6:11 ` Thomas Hellström
2006-10-10 6:11 ` Thomas Hellström
2006-10-10 7:55 ` Benjamin Herrenschmidt
2006-10-10 7:55 ` Benjamin Herrenschmidt
2006-10-10 8:39 ` Thomas Hellstrom
2006-10-10 8:39 ` Thomas Hellstrom
2006-10-09 20:45 ` Benjamin Herrenschmidt [this message]
2006-10-09 20:45 ` Benjamin Herrenschmidt
2006-10-09 12:09 ` Nick Piggin
2006-10-09 12:09 ` Nick Piggin
2006-10-09 12:11 ` Benjamin Herrenschmidt
2006-10-09 12:11 ` Benjamin Herrenschmidt
2006-10-10 12:10 ` Christoph Hellwig
2006-10-10 12:10 ` Christoph Hellwig
2006-10-10 12:13 ` Nick Piggin
2006-10-10 12:13 ` Nick Piggin
2006-10-10 17:52 ` Andrew Morton
2006-10-10 17:52 ` Andrew Morton
2006-10-11 0:43 ` SPAM: " Nick Piggin
2006-10-11 0:43 ` Nick Piggin
[not found] ` <5c77e7070610120456t1bdaa95cre611080c9c953582@mail.gmail.com>
2006-10-12 12:07 ` Nick Piggin
2006-10-12 12:07 ` Nick Piggin
2006-10-14 13:28 ` Ingo Oeser
2006-10-14 13:28 ` Ingo Oeser
2006-10-15 7:54 ` Nick Piggin
2006-10-15 7:54 ` Nick Piggin
2006-10-24 21:31 ` Dave Airlie
2006-10-24 21:31 ` Dave Airlie
2006-10-26 11:09 ` Nick Piggin
2006-10-26 11:09 ` Nick Piggin
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