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SubjectRe: pdflush eating a lot of CPU on heavy NFS I/O
> Could you please capture the contents of /proc/meminfo and /proc/vmstats
> when it's happening?
>
> Thanks.
>

Here is the top of top for one machine:

15:36:55 up 7:09, 1 user, load average: 1.00, 1.00, 1.00
48 processes: 46 sleeping, 2 running, 0 zombie, 0 stopped
CPU states: 0.1% user 99.8% system 0.0% nice 0.0% iowait 0.0% idle
Mem: 256992k av, 117644k used, 139348k free, 0k shrd, 36464k buff
50968k active, 51592k inactive
Swap: 514040k av, 0k used, 514040k free 61644k cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME CPU COMMAND
7 root 25 0 0 0 0 RW 99.4 0.0 415:26 0 pdflush

Here are memory stats for the same machine. The other machine's stats
are similar; there doesn't appear to be anything out of the ordinary and
its not even touching swap if these numbers are to be believed.

busterb@snowball2:~$ cat /proc/meminfo
MemTotal: 256992 kB
MemFree: 139700 kB
Buffers: 36464 kB
Cached: 61516 kB
SwapCached: 0 kB
Active: 50536 kB
Inactive: 51672 kB
HighTotal: 0 kB
HighFree: 0 kB
LowTotal: 256992 kB
LowFree: 139700 kB
SwapTotal: 514040 kB
SwapFree: 514040 kB
Dirty: 1876 kB
Writeback: 0 kB
Mapped: 8552 kB
Slab: 10924 kB
Committed_AS: 14612 kB
PageTables: 356 kB
VmallocTotal: 778164 kB
VmallocUsed: 2936 kB
VmallocChunk: 774708 kB

busterb@snowball2:~$ cat /proc/vmstat
nr_dirty 469
nr_writeback 0
nr_unstable 0
nr_page_table_pages 89
nr_mapped 2138
nr_slab 2730
pgpgin 79849
pgpgout 121656
pswpin 0
pswpout 0
pgalloc_high 0
pgalloc_normal 1812796
pgalloc_dma 18991
pgfree 1866775
pgactivate 55529
pgdeactivate 14634
pgfault 3622942
pgmajfault 2322
pgrefill_high 0
pgrefill_normal 16726
pgrefill_dma 49791
pgsteal_high 0
pgsteal_normal 11781
pgsteal_dma 203
pgscan_kswapd_high 0
pgscan_kswapd_normal 10065
pgscan_kswapd_dma 231
pgscan_direct_high 0
pgscan_direct_normal 2310
pgscan_direct_dma 0
pginodesteal 0
slabs_scanned 4349
kswapd_steal 9758
kswapd_inodesteal 0
pageoutrun 32
allocstall 35
pgrotated 0

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