Re: Memory leak in 2.6.11-rc1?

[Jens Axboe]

On Wed, Jan 26 2005, Jens Axboe wrote:
> On Wed, Jan 26 2005, Andrew Morton wrote:
> > Jens Axboe <axboe@xxxxxxx> wrote:
> > >
> > > On Wed, Jan 26 2005, Andrew Morton wrote:
> > > > Jens Axboe <axboe@xxxxxxx> 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

The (by far) two largest slab consumers are:

dentry_cache      140940 183060    216   18    1 : tunables  120   60
0 : slabdata  10170  10170      0

and

ext3_inode_cache  185494 194265    776    5    1 : tunables   54   27
0 : slabdata  38853  38853      0

there are about ~40k buffer_head entries as well.

-- 
Jens Axboe

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