How to detect slab memory leak

[Naruto Nguyen]

Hi Harsh and Mulyadi,

Thanks a lot  for your reply.

Just another question, in the slabtop output, I see that we have
kmalloc-64 and kmalloc-96 cache, when these caches increase their
size, is it calculated in the "cache" of the "free" command or in
"used". Is it reclaimable? and count in SReclaimable or SUnreclaim of
cat /proc/meminfo? I know some cache like dentry or inode cache will
be calculated in "cache" of free command output and SReclaimable of
cat /proc/meminfo and can be freed by "echo 3 >
/proc/sys/vm/drop_caches" but not sure if it the same situation for
kmalloc-64 and kmalloc-96 cache.

Thanks again,
Brs,
Bao

On Tue, 18 Dec 2018 at 15:31, Harsh Jain <harshjain.prof at gmail.com> wrote:
>
> You can try kernel config option "CONFIG_DEBUG_KMEMLEAK".
>
>
> https://www.kernel.org/doc/html/v4.10/dev-tools/kmemleak.html
>
> On Tue, Dec 18, 2018 at 1:14 PM Mulyadi Santosa
> <mulyadi.santosa at gmail.com> wrote:
> >
> >
> >
> > On Sun, Dec 16, 2018 at 1:25 PM Naruto Nguyen <narutonguyen2018 at gmail.com> wrote:
> >>
> >> Hi everyone,
> >>
> >> When using slabtop to display the cache size growing, I see that
> >> kmalloc-1024 and kmalloc-256 are increasing about 200MB after 1 hour.
> >> Is there any way to detect which kernel components cause this slab
> >> increase?
> >>
> >> Thanks a lot,
> >> Brs,
> >> Naruto
> >>
> >
> > Hello Naruto
> >
> > I think you can do it by instrumenting call to kmalloc(). These days, eBPF is the hot stuff to try for this matter. See if it fits yours too.
> >
> > regards,
> >
> > Mulyadi
> >
> >>
> >> _______________________________________________
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> >
> >
> >
> > --
> > regards,
> >
> > Mulyadi Santosa
> > Freelance Linux trainer and consultant
> >
> > blog: the-hydra.blogspot.com
> > training: mulyaditraining.blogspot.com
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