Re: Memory leak in 2.6.11-rc1?

[Jens Axboe <axboe@suse.de>]

On Wed, Jan 26 2005, Andrew Morton wrote:
> Jens Axboe <axboe@suse.de> wrote:
> >
> > On Wed, Jan 26 2005, Andrew Morton wrote:
> > > Jens Axboe <axboe@suse.de> wrote:
> > > >
> > > > But the 2.6.11-rcX vm is still very
> > > >  screwy, to get something close to nice and smooth behaviour I have to
> > > >  run a fillmem every now and then to reclaim used memory.
> > > 
> > > Can you provide more details?
> > 
> > Hmm not really, I just seem to have a very large piece of
> > non-cache/buffer memory that seems reluctant to shrink on light memory
> > pressure.
> 
> If it's not pagecache then what is it? slab?

Must be, if it's reclaimable.

> > This makes the box feel sluggish, if I force reclaim by
> > running fillmem and swapping on/off again, it feels much better.
> 
> before-n-after /proc/meminfo would be interesting.
> 
> If you actually meant that is _is_ sticky pagecache then perhaps the recent
> mark_page_accessed() changes in filemap.c, although I'd be surprised.

I don't think it's sticky page cache, it seems to shrink just fine. This
is my current situtation:

axboe@wiggum:/home/axboe $ free
             total       used       free     shared    buffers cached
Mem:       1024992    1015288       9704          0      76680 328148
-/+ buffers/cache:     610460     414532
Swap:            0          0          0

axboe@wiggum:/home/axboe $ cat /proc/meminfo 
MemTotal:      1024992 kB
MemFree:          9768 kB
Buffers:         76664 kB
Cached:         328024 kB
SwapCached:          0 kB
Active:         534956 kB
Inactive:       224060 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      1024992 kB
LowFree:          9768 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:            1400 kB
Writeback:           0 kB
Mapped:         464232 kB
Slab:           225864 kB
CommitLimit:    512496 kB
Committed_AS:   773844 kB
PageTables:       8004 kB
VmallocTotal: 34359738367 kB
VmallocUsed:       644 kB
VmallocChunk: 34359737167 kB
HugePages_Total:     0
HugePages_Free:      0
Hugepagesize:     2048 kB

> > I should mention that this is with 2.6.bk + andreas oom patches that he
> > asked me to test. I can try 2.6.11-rc2-bkX if you think I should.
> 
> They shouldn't be causing this sort of thing.

I didn't think so, just mentioning it for completeness :)

-- 
Jens Axboe