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SubjectRe: Severe trashing in 2.4.4
On Sun, Apr 29, 2001 at 12:27:29PM -0400, Alexander Viro wrote:
> What about /proc/slabinfo? Notice that 2.4.4 (and couple of the 2.4.4-pre)
> has a bug in prune_icache() that makes it underestimate the amount of
> freeable inodes.

Gotcha, wrt. slabinfo. Seems 2.4.4 (at least on my box) only knows how to
allocate skbuff_head_cache entries, not how to free them. Here's the last
/proc/slabinfo entry before I sysRQ'd the box:

slabinfo - version: 1.1 (SMP)
kmem_cache 68 68 232 4 4 1 : 252 126
nfs_read_data 10 10 384 1 1 1 : 124 62
nfs_write_data 10 10 384 1 1 1 : 124 62
nfs_page 40 40 96 1 1 1 : 252 126
urb_priv 1 113 32 1 1 1 : 252 126
uhci_desc 1074 1239 64 21 21 1 : 252 126
ip_mrt_cache 0 0 96 0 0 1 : 252 126
tcp_tw_bucket 0 0 96 0 0 1 : 252 126
tcp_bind_bucket 16 226 32 2 2 1 : 252 126
tcp_open_request 0 0 64 0 0 1 : 252 126
inet_peer_cache 1 59 64 1 1 1 : 252 126
ip_fib_hash 20 226 32 2 2 1 : 252 126
ip_dst_cache 13 48 160 2 2 1 : 252 126
arp_cache 2 60 128 2 2 1 : 252 126
blkdev_requests 1024 1040 96 26 26 1 : 252 126
dnotify cache 0 0 20 0 0 1 : 252 126
file lock cache 126 126 92 3 3 1 : 252 126
fasync cache 3 202 16 1 1 1 : 252 126
uid_cache 5 226 32 2 2 1 : 252 126
skbuff_head_cache 341136 341136 160 14214 14214 1 : 252 126
sock 201 207 832 23 23 2 : 124 62
inode_cache 741 1640 480 205 205 1 : 124 62
bdev_cache 7 59 64 1 1 1 : 252 126
sigqueue 58 58 132 2 2 1 : 252 126
dentry_cache 790 3240 128 108 108 1 : 252 126
dquot 0 0 96 0 0 1 : 252 126
filp 1825 1880 96 47 47 1 : 252 126
names_cache 9 9 4096 9 9 1 : 60 30
buffer_head 891 2880 96 72 72 1 : 252 126
mm_struct 180 180 128 6 6 1 : 252 126
vm_area_struct 4033 4248 64 72 72 1 : 252 126
fs_cache 207 236 64 4 4 1 : 252 126
files_cache 132 135 416 15 15 1 : 124 62
signal_act 108 111 1312 37 37 1 : 60 30
size-131072(DMA) 0 0 131072 0 0 32 : 0 0
size-131072 0 0 131072 0 0 32 : 0 0
size-65536(DMA) 0 0 65536 0 0 16 : 0 0
size-65536 0 0 65536 0 0 16 : 0 0
size-32768(DMA) 0 0 32768 0 0 8 : 0 0
size-32768 3 3 32768 3 3 8 : 0 0
size-16384(DMA) 0 0 16384 0 0 4 : 0 0
size-16384 8 9 16384 8 9 4 : 0 0
size-8192(DMA) 0 0 8192 0 0 2 : 0 0
size-8192 1 1 8192 1 1 2 : 0 0
size-4096(DMA) 0 0 4096 0 0 1 : 60 30
size-4096 73 73 4096 73 73 1 : 60 30
size-2048(DMA) 0 0 2048 0 0 1 : 60 30
size-2048 66338 66338 2048 33169 33169 1 : 60 30
size-1024(DMA) 0 0 1024 0 0 1 : 124 62
size-1024 6372 6372 1024 1593 1593 1 : 124 62
size-512(DMA) 0 0 512 0 0 1 : 124 62
size-512 22776 22776 512 2847 2847 1 : 124 62
size-256(DMA) 0 0 256 0 0 1 : 252 126
size-256 75300 75300 256 5020 5020 1 : 252 126
size-128(DMA) 0 0 128 0 0 1 : 252 126
size-128 1309 1410 128 47 47 1 : 252 126
size-64(DMA) 0 0 64 0 0 1 : 252 126
size-64 4838 4838 64 82 82 1 : 252 126
size-32(DMA) 0 0 32 0 0 1 : 252 126
size-32 33900 33900 32 300 300 1 : 252 126

From the same moment, the contents of /proc/meminfo:

total: used: free: shared: buffers: cached:
Mem: 262049792 260423680 1626112 0 1351680 6348800
Swap: 511926272 39727104 472199168
MemTotal: 255908 kB
MemFree: 1588 kB
MemShared: 0 kB
Buffers: 1320 kB
Cached: 6200 kB
Active: 2648 kB
Inact_dirty: 1260 kB
Inact_clean: 3604 kB
Inact_target: 3960 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 255908 kB
LowFree: 1588 kB
SwapTotal: 499928 kB
SwapFree: 461132 kB

And to top-10 memury hogs:

892 54696 2279 /usr/bin/X11/XFree86 -depth 16 -gamma 1.6 -auth /var/lib/gdm/:0
632 2932 11363 ps -ax -o rss,vsz,pid,command
600 8988 2785 gnome-terminal -t frank@behemoth.localnet
368 7660 2685 multiload_applet --activate-goad-server multiload_applet --goad
312 2100 4731 top
308 7528 2675 gnomexmms --activate-goad-server gnomexmms --goad-fd 10
244 7660 2701 multiload_applet --activate-goad-server multiload_applet --goad
240 7436 2682 asclock_applet --activate-goad-server asclock_applet --goad-fd
4 11740 1110 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=my
4 11740 1109 /usr/sbin/mysqld --basedir=/ --datadir=/var/lib/mysql --user=my

I've got a ton of logging from /proc/slabinfo, one entry a second. If someone
wants to peruse it, you can find it here:

http://www.unternet.org/~frank/projects/linux2404/2404-meminfo/

The .diff files are diffs between 'current' and 'previous' (one second
interval) snapshots. slabinfo and meminfo are self-explanatory I guess. The
'memhogs' entry is the top-10 memory users list for each second of logging.

Cheers//Frank
--
WWWWW _______________________
## o o\ / Frank de Lange \
}# \| / \
##---# _/ <Hacker for Hire> \
#### \ +31-320-252965 /
\ frank@unternet.org /
-------------------------
[ "Omnis enim res, quae dando non deficit, dum habetur
et non datur, nondum habetur, quomodo habenda est." ]
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