linux_dsm_epyc7002/include
Pengfei Li 688fcbfc06 mm/vmalloc: modify struct vmap_area to reduce its size
Objective
---------

The current implementation of struct vmap_area wasted space.

After applying this commit, sizeof(struct vmap_area) has been
reduced from 11 words to 8 words.

Description
-----------

1) Pack "subtree_max_size", "vm" and "purge_list".  This is no problem
   because

A) "subtree_max_size" is only used when vmap_area is in "free" tree

B) "vm" is only used when vmap_area is in "busy" tree

C) "purge_list" is only used when vmap_area is in vmap_purge_list

2) Eliminate "flags".

;Since only one flag VM_VM_AREA is being used, and the same thing can be
done by judging whether "vm" is NULL, then the "flags" can be eliminated.

Link: http://lkml.kernel.org/r/20190716152656.12255-3-lpf.vector@gmail.com
Signed-off-by: Pengfei Li <lpf.vector@gmail.com>
Suggested-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Hillf Danton <hdanton@sina.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Cc: Roman Gushchin <guro@fb.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2019-09-24 15:54:10 -07:00
..
acpi
asm-generic mm: consolidate pgtable_cache_init() and pgd_cache_init() 2019-09-24 15:54:09 -07:00
clocksource
crypto
drm
dt-bindings Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
keys
kvm
linux mm/vmalloc: modify struct vmap_area to reduce its size 2019-09-24 15:54:10 -07:00
math-emu
media
misc
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2019-09-18 12:34:53 -07:00
pcmcia
ras
rdma RDMA subsystem updates for 5.4 2019-09-21 10:26:24 -07:00
scsi SCSI misc on 20190919 2019-09-21 10:50:15 -07:00
soc Char/Misc driver patches for 5.4-rc1 2019-09-18 11:14:31 -07:00
sound
target
trace for-5.4-tag 2019-09-18 17:29:31 -07:00
uapi f2fs-for-5.4-rc1 2019-09-21 14:26:33 -07:00
vdso
video
xen
Kbuild RDMA subsystem updates for 5.4 2019-09-21 10:26:24 -07:00