Re: sysfs_dir_cache growing out of control

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From: Joel Fuster <j@fuster.org>
To: linux-kernel@vger.kernel.org
Cc: Joel Fuster <j@fuster.org>
Subject: Re: sysfs_dir_cache growing out of control
Date: Wed, 22 Aug 2007 23:56:44 -0400	[thread overview]
Message-ID: <46CD057C.3080106@fuster.org> (raw)
In-Reply-To: <46CCD3DF.4080303@fuster.org>

Joel Fuster wrote:
> Hi,
> 
> I am running 2.6.22.3.  For reasons that escape me, over time (days) the 
> sysfs_dir_cache, dentry, and inode_cache SLUB entries grow until they 
> consume all the memory on my system, requiring a reboot.
> 
> Although I did not record objective evidence of this at the time, I 
> suspect I had the same problem with 2.6.18 and 2.6.20...I certainly had 
> the same symptoms.

An update to this...it seems to be related to "scanbuttond" which is an 
app that uses libusb to poll a scanner for button presses on the scanner 
itself.  The number of objects in sysfs_dir_cache stops growing when I 
kill the scanbuttond process.

An strace of one poll loop for scanbuttond follows:


nanosleep({0, 333000000}, NULL)         = 0
open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 4 entries */, 4096)      = 96
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/002", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 3 entries */, 4096)      = 72
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\0\2\t\0\1@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8)       = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\4\0\f", 17) = 17
close(2)                                = 0
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 4 entries */, 4096)      = 96
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/002", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 3 entries */, 4096)      = 72
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\0\2\t\0\1@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8)       = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\4\0\f", 17) = 17
close(2)                                = 0
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 5 entries */, 4096)      = 120
open("/dev/bus/usb/001/004", O_RDWR)    = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = 0
read(2, "\22\1\20\1\0\0\0@\330\5\3@\0\1\0\0\0\1", 18) = 18
read(2, "\t\2 \0\1\1\0\240", 8)         = 8
read(2, "\372\t\4\0\0\2\377\377\377\0\7\5\201\2@\0\0\7\5\2\2@\0"..., 24) 
= 24
close(2)                                = 0
open("/dev/bus/usb/001/003", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\20\1\0\0\0@{\6\3#\0\3\1\2\0\1", 18) = 18
read(2, "\t\2\'\0\1\1\0\200", 8)        = 8
read(2, "2\t\4\0\0\3\377\0\0\0\7\5\201\3\n\0\1\7\5\2\2@\0\0\7\5"..., 31) 
= 31
close(2)                                = 0
open("/dev/bus/usb/001/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\20\1\t\0\0@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8)       = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\2\0\377", 17) = 17
close(2)                                = 0
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/001/004", O_RDWR)    = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 ENOTTY (Inappropriate 
ioctl for device)
close(1)                                = 0
open("/dev/bus/usb/001/003", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb/001/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=80, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 4 entries */, 4096)      = 96
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/002", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=60, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 3 entries */, 4096)      = 72
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\0\2\t\0\1@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8)       = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\4\0\f", 17) = 17
close(2)                                = 0
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb/001", O_RDONLY|O_NONBLOCK|O_DIRECTORY) = 1
fstat(1, {st_mode=S_IFDIR|0755, st_size=100, ...}) = 0
fcntl(1, F_SETFD, FD_CLOEXEC)           = 0
getdents(1, /* 5 entries */, 4096)      = 120
open("/dev/bus/usb/001/004", O_RDWR)    = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = 0
read(2, "\22\1\20\1\0\0\0@\330\5\3@\0\1\0\0\0\1", 18) = 18
read(2, "\t\2 \0\1\1\0\240", 8)         = 8
read(2, "\372\t\4\0\0\2\377\377\377\0\7\5\201\2@\0\0\7\5\2\2@\0"..., 24) 
= 24
close(2)                                = 0
open("/dev/bus/usb/001/003", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\20\1\0\0\0@{\6\3#\0\3\1\2\0\1", 18) = 18
read(2, "\t\2\'\0\1\1\0\200", 8)        = 8
read(2, "2\t\4\0\0\3\377\0\0\0\7\5\201\3\n\0\1\7\5\2\2@\0\0\7\5"..., 31) 
= 31
close(2)                                = 0
open("/dev/bus/usb/001/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY)  = 2
ioctl(2, USBDEVFS_CONNECTINFO, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
read(2, "\22\1\20\1\t\0\0@\0\0\0\0\6\2\3\2\1\1", 18) = 18
read(2, "\t\2\31\0\1\1\0\340", 8)       = 8
read(2, "\0\t\4\0\0\1\t\0\0\0\7\5\201\3\2\0\377", 17) = 17
close(2)                                = 0
getdents(1, /* 0 entries */, 4096)      = 0
close(1)                                = 0
open("/dev/bus/usb/001/004", O_RDWR)    = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 ENOTTY (Inappropriate 
ioctl for device)
close(1)                                = 0
open("/dev/bus/usb/001/003", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/003", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb/001/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/001/001", O_RDONLY)  = 1
ioctl(1, USBDEVFS_IOCTL, 0x7fffb3a08420) = -1 EPERM (Operation not 
permitted)
close(1)                                = 0
open("/dev/bus/usb/001/004", O_RDWR)    = 1
ioctl(1, USBDEVFS_CLAIMINTERFACE, 0x7fffb3a0848c) = 0
ioctl(1, USBDEVFS_CONTROL, 0x7fffb3a08420) = 64
ioctl(1, USBDEVFS_CONTROL, 0x7fffb3a08420) = 8
ioctl(1, USBDEVFS_RELEASEINTERFACE, 0x7fffb3a08494) = 0
close(1)                                = 0
nanosleep({0, 333000000},  <unfinished ...>

next prev parent reply	other threads:[~2007-08-23  3:56 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-23  0:25 sysfs_dir_cache growing out of control Joel Fuster
2007-08-23  3:56 ` Joel Fuster [this message]
2007-08-23  9:59   ` Greg KH
2007-08-24  0:44     ` Joel Fuster
2007-08-24  0:54       ` Greg KH
2007-08-24  1:26         ` Gabriel C
2007-09-05 16:03           ` Andrew Morton

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