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SubjectMonster file_lock_cache entry in /proc/slabinfo
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Date
My notebook has been slowing down the longer it is up for several
kernel versions. Disk i/o seems to be the chokepoint.

I grabbed slabinfo before today's reboot. The box had been up for 10
days -- it starts to become painful after about five or six days.

The file_lock_cache entry seemed rather engrossed:

file_lock_cache 2339148 2339148 92 42 1 : \
tunables 120 60 0 : \
slabdata 55694 55694 0

55694 slabs containing 2339148 objs?

The biggest user of file locking would be incoming email. uucico(8)
polls a remote server, injects the mail to postfix(8) via postfix's
/usr/sbin/sendmail. Postfix delivers via procmail(1), which pipes
the mail through SpamAssassin and then delivers to foo/. style
destinations. The recipies all start with :0:, so a local lock
file is used in each directory. The destination filesystem is
ext3 with htree (and the default journal style).

I presume something is calling locks_alloc_lock but then failing to
also call locks_free_lock, but /proc/locks only ever shows around 6 or
so entries....

Any suggestions on debugging this?

-JimC

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