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Commit 34679d7e authored by Shaohua Li's avatar Shaohua Li Committed by Linus Torvalds
Browse files

mmap: add alignment for some variables 



Make some variables have correct alignment/section to avoid cache issue.
In a workload which heavily does mmap/munmap, the variables will be used
frequently.

Signed-off-by: default avatarShaohua Li <shaohua.li@intel.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 7bf02ea2

mm/mmap.c

+7 −3
Original line number Original line Diff line number Diff line
@@ -84,10 +84,14 @@ pgprot_t vm_get_page_prot(unsigned long vm_flags) 
}

}

EXPORT_SYMBOL(vm_get_page_prot);

EXPORT_SYMBOL(vm_get_page_prot);





int sysctl_overcommit_memory = OVERCOMMIT_GUESS;  /* heuristic overcommit */

int sysctl_overcommit_memory __read_mostly = OVERCOMMIT_GUESS;  /* heuristic overcommit */

int sysctl_overcommit_ratio = 50;	/* default is 50% */

int sysctl_overcommit_ratio __read_mostly = 50;	/* default is 50% */

int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;

int sysctl_max_map_count __read_mostly = DEFAULT_MAX_MAP_COUNT;

struct percpu_counter vm_committed_as;

/*

 * Make sure vm_committed_as in one cacheline and not cacheline shared with

 * other variables. It can be updated by several CPUs frequently.

 */

struct percpu_counter vm_committed_as ____cacheline_aligned_in_smp;





/*

/*

 * Check that a process has enough memory to allocate a new virtual

 * Check that a process has enough memory to allocate a new virtual