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

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Message-ID: <20190710013100.GA21604@tower.DHCP.thefacebook.com>
Date:   Wed, 10 Jul 2019 01:31:05 +0000
From:   Roman Gushchin <guro@...com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Minchan Kim <minchan@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Kernel Team <Kernel-team@...com>,
        Johannes Weiner <hannes@...xchg.org>
Subject: Re: [PATCH RESEND] mm: show number of vmalloc pages in /proc/meminfo

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@...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@...com>
> > Acked-by: Johannes Weiner <hannes@...xchg.org>
> > Acked-by: Vlastimil Babka <vbabka@...e.cz>
> Acked-by: Minchan Kim <minchan@...nel.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!