Re: [PATCH RESEND] mm: show number of vmalloc pages in /proc/meminfo

[Roman Gushchin <guro@fb.com>]

On Tue, Jul 09, 2019 at 02:59:42PM +0900, Minchan Kim wrote:
> Hi Roman,
> 
> 
> On Wed, May 15, 2019 at 8:51 AM Roman Gushchin <guro@fb.com> wrote:
> >
> > Vmalloc() is getting more and more used these days (kernel stacks,
> > bpf and percpu allocator are new top users), and the total %
> > of memory consumed by vmalloc() can be pretty significant
> > and changes dynamically.
> >
> > /proc/meminfo is the best place to display this information:
> > its top goal is to show top consumers of the memory.
> >
> > Since the VmallocUsed field in /proc/meminfo is not in use
> > for quite a long time (it has been defined to 0 by the
> > commit a5ad88ce8c7f ("mm: get rid of 'vmalloc_info' from
> > /proc/meminfo")), let's reuse it for showing the actual
> > physical memory consumption of vmalloc().
> >
> > Signed-off-by: Roman Gushchin <guro@fb.com>
> > Acked-by: Johannes Weiner <hannes@cmpxchg.org>
> > Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Acked-by: Minchan Kim <minchan@kernel.org>
> 
> How it's going on?
> Android needs this patch since it has gathered vmalloc pages from
> /proc/vmallocinfo. It's too slow.
> 

Andrew, can you, please, pick this one?

It has been in the mm tree already, but then it was dropped
because of some other non-related patches in the series
conflicted with some x86 changes. This patch is useful
by itself, and doesn't depend on anything else.

Thanks!