[PATCH v4 0/2] vmalloc enhancements

From: Roman Gushchin
Date: Wed Apr 17 2019 - 15:40:54 EST

The patchset removes a redundant operation in __vunmap()
and exports a number of pages, used by vmalloc(),
in /proc/meminfo.

Patch (1) removes some redundancy on __vunmap().
Patch (2) adds vmalloc counter to /proc/meminfo.

- rebased on top of current mm tree
- dropped alloc_vmap_area() refactoring

- switched back to atomic after more accurate perf measurements:
no visible perf difference
- added perf stacktraces in commmit message of (1)

- rebased on top of current mm tree
- switch from atomic to percpu vmalloc page counter

- removed bogus empty lines (suggested by Matthew Wilcox)
- made nr_vmalloc_pages static (suggested by Matthew Wilcox)
- dropped patch 3 from RFC patchset, will post later with
some other changes
- dropped RFC

Roman Gushchin (2):
mm: refactor __vunmap() to avoid duplicated call to find_vm_area()
mm: show number of vmalloc pages in /proc/meminfo

fs/proc/meminfo.c | 2 +-
include/linux/vmalloc.h | 2 ++
mm/vmalloc.c | 57 ++++++++++++++++++++++++++---------------
3 files changed, 40 insertions(+), 21 deletions(-)