mm: vmalloc: show number of vmalloc pages in /proc/meminfo
authorRoman Gushchin <guro@fb.com>
Fri, 12 Jul 2019 04:00:13 +0000 (21:00 -0700)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 12 Jul 2019 18:05:47 +0000 (11:05 -0700)
commit97105f0ab7b877a8ece2005e214894e93793950c
treeb286da5390c53afa0adca840b05265aa7cccbb32
parentee2ad71b0756e995fa4f6d922463e9bccd71b198
mm: vmalloc: show number of vmalloc pages in /proc/meminfo

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 a5ad88ce8c7f ("mm: get rid of
'vmalloc_info' from /proc/meminfo")), let's reuse it for showing the
actual physical memory consumption of vmalloc().

Link: http://lkml.kernel.org/r/20190417194002.12369-3-guro@fb.com
Signed-off-by: Roman Gushchin <guro@fb.com>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
fs/proc/meminfo.c
include/linux/vmalloc.h
mm/vmalloc.c