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Miaohe Lin 0aa7f3544a mm/hugetlb: avoid unnecessary hugetlb_acct_memory() call 
When reservation accounting remains unchanged, hugetlb_acct_memory() will
do nothing except holding and releasing hugetlb_lock.  We should avoid
this unnecessary hugetlb_lock lock/unlock cycle which is happening on
'most' hugetlb munmap operations by check delta against 0 at the beginning
of hugetlb_acct_memory.

Link: https://lkml.kernel.org/r/20210115092013.61012-1-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2021-02-24 13:38:32 -08:00
arch MIPS: do not call flush_tlb_all when setting pmd entry 2021-02-24 13:38:32 -08:00
block
certs
crypto
Documentation mm/gfp: add kernel-doc for gfp_t 2021-02-24 13:38:32 -08:00
drivers video: fbdev: acornfb: remove free_unused_pages() 2021-02-24 13:38:31 -08:00
fs vmalloc: remove redundant NULL check 2021-02-24 13:38:30 -08:00
include mm/gfp: add kernel-doc for gfp_t 2021-02-24 13:38:32 -08:00
init
ipc
kernel
lib kasan: don't run tests when KASAN is not enabled 2021-02-24 13:38:31 -08:00
LICENSES
mm mm/hugetlb: avoid unnecessary hugetlb_acct_memory() call 2021-02-24 13:38:32 -08:00
net
samples
scripts
security
sound
tools kasan: prefix global functions with kasan_ 2021-02-24 13:38:30 -08:00
usr
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.cocciconfig
.get_maintainer.ignore
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README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.