Re: [PATCH 3/3] mm: oom: show unreclaimable slab info when unreclaimable slabs > user memory

[Michal Hocko]

On Mon 09-10-17 08:33:16, Michal Hocko wrote:
> On Sat 07-10-17 00:37:55, Yang Shi wrote:
> > 
> > 
> > On 10/6/17 2:37 AM, Michal Hocko wrote:
> > > On Thu 05-10-17 05:29:10, Yang Shi wrote:
> [...]
> > > > +	list_for_each_entry_safe(s, s2, &slab_caches, list) {
> > > > +		if (!is_root_cache(s) || (s->flags & SLAB_RECLAIM_ACCOUNT))
> > > > +			continue;
> > > > +
> > > > +		memset(&sinfo, 0, sizeof(sinfo));
> > > 
> > > why do you zero out the structure. All the fields you are printing are
> > > filled out in get_slabinfo.
> > 
> > No special reason, just wipe out the potential stale data on the stack.
> 
> Do not add code that has no meaning. The OOM killer is a slow path but
> that doesn't mean we should throw spare cycles out of the window.

With this fixed and the compile fix [1] folded, feel free to add my
Acked-by: Michal Hocko <mhocko@xxxxxxxx>

[1] http://lkml.kernel.org/r/1507492085-42264-1-git-send-email-yang.s@xxxxxxxxxxxxxxx

-- 
Michal Hocko
SUSE Labs