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SubjectRe: Possible dcache BUG


On Thu, 12 Aug 2004, Udo A. Steinberg wrote:
>
> After nearly 2 days of running 2.6.8-rc4 with above patch backed out, the
> machine has gone back into heavy swapping, being rather unresponsive for
> several minutes. At that time the only bigger applications running were
> X and my mailer, as can be seen in the ps output below.

Your slab usage seems to be:

cumulative usage name
========= ====== ====
.....
2,021,428 151,552 pgd
2,182,804 161,376 size-96
2,367,124 184,320 biovec-(256)
2,559,124 192,000 biovec-128
2,751,124 192,000 biovec-64
2,997,076 245,952 ext3_inode_cache
3,255,124 258,048 size-1024
3,545,940 290,816 size-512
3,843,468 297,528 radix_tree_node
4,153,932 310,464 inode_cache
4,494,972 341,040 dentry_cache
4,994,684 499,712 size-8192
5,912,188 917,504 size-32768
105,397,820 99,485,632 size-64
Something pretty much stands out.

What the _heck_ is doing 64-byte allocations and leaking them?

Can you figure out what triggers it for you? If nothing obvious comes to
mind, could you do something really silly like this

--- 1.141/mm/slab.c 2004-07-11 01:52:48 -07:00
+++ edited/mm/slab.c 2004-08-12 18:30:00 -07:00
@@ -2360,6 +2360,11 @@
*/
BUG_ON(csizep->cs_cachep == NULL);
#endif
+ if (csizep->cs_size == 64) {
+ static unsigned count;
+ if (!(4095 & ++count))
+ dump_stack();
+ }
return __cache_alloc(flags & GFP_DMA ?
csizep->cs_dmacachep : csizep->cs_cachep, flags);
}

(totally whitespace-damaged) which should just print out a stack dump
every four thoudand allocations, which should give a good clue (somebody
else might also be allocating those 64-byte things, but _likely_ we'll see
at least one of the leakers.. Maybe.)


Linus
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