From: "David S. Miller" <davem@davemloft.net>
To: Hugh Dickins <hugh@veritas.com>
Cc: akpm@osdl.org, nickpiggin@yahoo.com.au, tony.luck@intel.com,
benh@kernel.crashing.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/5] freepgt: free_pgtables use vma list
Date: Tue, 22 Mar 2005 10:34:23 -0800 [thread overview]
Message-ID: <20050322103423.53cfaae5.davem@davemloft.net> (raw)
In-Reply-To: <Pine.LNX.4.61.0503221617440.8666@goblin.wat.veritas.com>
On Tue, 22 Mar 2005 16:37:09 +0000 (GMT)
Hugh Dickins <hugh@veritas.com> wrote:
> If you and David could try the lame patch below,
> it'll at least give us a slight clue of where to be looking -
> every mm exiting with nr_ptes 1 means something different from
> every mm exiting with nr_ptes -1 means something different from
> occasional mms exiting with nr_ptes something positive.
I didn't use your debugging patch, I used something slightly
more sophisticated to simply traces nr_ptes counter bumps
then halt the system when the BUG_ON(mm->nr_ptes) triggered
so I could analyze things.
What happens is (all virtual addresses are PMD_MASK'd):
1) We map 3 PTE tables.
0x0000000000000000
0x0000000070000000
0x00000000ef800000
2) We only unmap one PTE table.
0x0000000000000000
3) Then we of course BUG() because nr_ptes is 2
I'm now adding more debugging to figure out why only the
first PTE table is being unmapped.
next prev parent reply other threads:[~2005-03-22 18:39 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-03-21 20:52 [PATCH 1/5] freepgt: free_pgtables use vma list Hugh Dickins
2005-03-21 20:55 ` [PATCH 2/5] freepgt: remove MM_VM_SIZE(mm) Hugh Dickins
2005-03-21 20:56 ` [PATCH 3/5] freepgt: hugetlb_free_pgd_range Hugh Dickins
2005-03-21 20:57 ` [PATCH 4/5] freepgt: remove arch pgd_addr_end Hugh Dickins
2005-03-21 20:58 ` [PATCH 5/5] freepgt: mpnt to vma cleanup Hugh Dickins
2005-03-21 22:26 ` [PATCH 1/5] freepgt: free_pgtables use vma list David S. Miller
2005-03-22 5:47 ` Hugh Dickins
2005-03-22 17:41 ` David S. Miller
2005-03-22 11:40 ` Andrew Morton
2005-03-22 12:17 ` Nick Piggin
2005-03-22 16:37 ` Hugh Dickins
2005-03-22 18:34 ` David S. Miller [this message]
2005-03-22 19:01 ` David S. Miller
2005-03-22 19:21 ` David S. Miller
2005-03-22 19:23 ` David S. Miller
2005-03-22 19:36 ` Hugh Dickins
2005-03-22 20:21 ` David S. Miller
2005-03-22 23:45 ` Benjamin Herrenschmidt
2005-03-22 20:33 ` David S. Miller
2005-03-22 21:51 ` Hugh Dickins
2005-03-22 22:41 ` David S. Miller
2005-03-23 0:51 ` Hugh Dickins
2005-03-23 2:09 ` David S. Miller
2005-03-22 23:32 ` Nick Piggin
2005-03-22 23:44 ` David S. Miller
2005-03-23 0:19 ` Nick Piggin
2005-03-23 0:20 ` David S. Miller
2005-03-23 0:00 ` David S. Miller
2005-03-23 0:03 ` David S. Miller
2005-03-22 21:28 ` David S. Miller
2005-03-22 23:30 ` Benjamin Herrenschmidt
2005-03-23 13:28 ` Hugh Dickins
2005-03-23 23:07 ` Benjamin Herrenschmidt
-- strict thread matches above, loose matches on Subject: below --
2005-03-21 22:31 Luck, Tony
2005-03-21 23:02 ` David S. Miller
2005-03-22 4:14 ` Nick Piggin
2005-03-22 5:29 ` David S. Miller
2005-03-22 6:08 ` Hugh Dickins
2005-03-22 6:33 ` Nick Piggin
2005-03-22 17:52 ` David S. Miller
2005-03-22 17:55 ` David S. Miller
2005-03-22 5:42 ` Hugh Dickins
2005-03-22 18:06 Luck, Tony
2005-03-22 18:48 ` Hugh Dickins
2005-03-22 22:40 Luck, Tony
2005-03-22 23:30 ` David S. Miller
2005-03-23 0:40 ` Hugh Dickins
2005-03-22 23:53 Luck, Tony
2005-03-22 23:56 ` David S. Miller
2005-03-23 0:56 ` Hugh Dickins
2005-03-23 1:10 ` Andrew Morton
2005-03-23 2:00 ` David S. Miller
2005-03-23 2:10 ` Nick Piggin
2005-03-23 2:15 ` David S. Miller
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