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mm: Add min_free_order_shift tunable.

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By default the kernel tries to keep half as much memory free at each
order as it does for one order below. This can be too agressive when
running without swap.

Signed-off-by: Arve Hjønnevåg <arve@android.com>
This commit is contained in:
Arve Hjønnevåg 2009-02-17 14:51:02 -08:00
parent 7725dd9abd
commit c177d04116
2 changed files with 11 additions and 1 deletions
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9
kernel/sysctl.c
View File

@ -79,6 +79,7 @@ extern char core_pattern[];
extern unsigned int core_pipe_limit;
extern int pid_max;
extern int min_free_kbytes;
extern int min_free_order_shift;
extern int pid_max_min, pid_max_max;
extern int sysctl_drop_caches;
extern int percpu_pagelist_fraction;
@ -1228,6 +1229,14 @@ static struct ctl_table vm_table[] = {
.strategy = &sysctl_intvec,
.extra1 = &zero,
},
{
.ctl_name = CTL_UNNUMBERED,
.procname = "min_free_order_shift",
.data = &min_free_order_shift,
.maxlen = sizeof(min_free_order_shift),
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.ctl_name = VM_PERCPU_PAGELIST_FRACTION,
.procname = "percpu_pagelist_fraction",

3
mm/page_alloc.c
View File

@ -122,6 +122,7 @@ static char * const zone_names[MAX_NR_ZONES] = {
};
int min_free_kbytes = 1024;
int min_free_order_shift = 1;
static unsigned long __meminitdata nr_kernel_pages;
static unsigned long __meminitdata nr_all_pages;
@ -1379,7 +1380,7 @@ int zone_watermark_ok(struct zone *z, int order, unsigned long mark,
free_pages -= z->free_area[o].nr_free << o;
/* Require fewer higher order pages to be free */
min >>= 1;
min >>= min_free_order_shift;
if (free_pages <= min)
return 0;