linux-ext4 - mballoc and inode prealloc space deletion

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Message-ID: <20080108105341.GA11659@skywalker>
Date:	Tue, 8 Jan 2008 16:23:41 +0530
From:	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To:	Alex Tomas <bzzz@....com>, Andreas Dilger <adilger@....com>
Cc:	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: mballoc and inode prealloc space deletion

Hi Alex,

With the latest changes i see both group preallocation and inode
preallocation being used by mballoc. Since the choice is now made with
file size not just the request size. (None of the test were actually
using inode prealloc previously). Now that the test are using inode prealloc i
see the below dump stack on the console. I guess you put in the dump
stack there to  find out how often these happen. Do you still want the
dump stack to be there. Or can I remove it. ?

uh-oh! some one just deleted it
Call Trace:
[c0000000e4143970] [c000000000010554] .show_stack+0x6c/0x1a0
(unreliable)
[c0000000e4143a10] [c00000000019db90]
.ext4_mb_discard_inode_preallocations+0x1d4/0x428
[c0000000e4143b20] [c000000000178e8c]
.ext4_discard_reservation+0x30/0xb4
[c0000000e4143bc0] [c00000000017c0b8] .ext4_release_file+0x54/0xbc
[c0000000e4143c50] [c0000000000de4b0] .__fput+0x114/0x214
[c0000000e4143d00] [c0000000000db2d8] .filp_close+0xb0/0xd8
[c0000000e4143d90] [c0000000000dbb20] .sys_close+0xc4/0x128
[c0000000e4143e30] [c00000000000872c] syscall_exit+0x0/0x40
uh-oh! some one just deleted it
Call Trace:
[c0000000ede97970] [c000000000010554] .show_stack+0x6c/0x1a0
(unreliable)
[c0000000ede97a10] [c00000000019db90]
.ext4_mb_discard_inode_preallocations+0x1d4/0x428
[c0000000ede97b20] [c000000000178e8c]
.ext4_discard_reservation+0x30/0xb4
[c0000000ede97bc0] [c00000000017c0b8] .ext4_release_file+0x54/0xbc
[c0000000ede97c50] [c0000000000de4b0] .__fput+0x114/0x214
[c0000000ede97d00] [c0000000000db2d8] .filp_close+0xb0/0xd8
[c0000000ede97d90] [c0000000000dbb20] .sys_close+0xc4/0x128
[c0000000ede97e30] [c00000000000872c] syscall_exit+0x0/0x40
uh-oh! some one just deleted it
Call Trace:
[c0000000e6b1f970] [c000000000010554] .show_stack+0x6c/0x1a0
(unreliable)
[c0000000e6b1fa10] [c00000000019db90]
.ext4_mb_discard_inode_preallocations+0x1d4/0x428
[c0000000e6b1fb20] [c000000000178e8c]
.ext4_discard_reservation+0x30/0xb4
[c0000000e6b1fbc0] [c00000000017c0b8] .ext4_release_file+0x54/0xbc
[c0000000e6b1fc50] [c0000000000de4b0] .__fput+0x114/0x214
[c0000000e6b1fd00] [c0000000000db2d8] .filp_close+0xb0/0xd8
[c0000000e6b1fd90] [c0000000000dbb20] .sys_close+0xc4/0x128
[c0000000e6b1fe30] [c00000000000872c] syscall_exit+0x0/0x40
-- 0:conmux-control -- time-stamp -- Jan/08/08  2:20:11 --
-- 0:conmux-control -- time-stamp -- Jan/08/08  2:38:19 --
(bot:conmon-payload) disconnected

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