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63 lines
1.9 KiB
Diff
63 lines
1.9 KiB
Diff
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From d620f695290e4ffb1586420ba1dbbb5b2c8c075d Mon Sep 17 00:00:00 2001
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From: =?utf-8?q?Arve=20Hj=C3=B8nnev=C3=A5g?= <arve@android.com>
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Date: Tue, 17 Feb 2009 14:51:02 -0800
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Subject: [PATCH 055/134] mm: Add min_free_order_shift tunable.
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MIME-Version: 1.0
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Content-Type: text/plain; charset=utf-8
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Content-Transfer-Encoding: 8bit
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By default the kernel tries to keep half as much memory free at each
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order as it does for one order below. This can be too agressive when
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running without swap.
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Signed-off-by: Arve Hjønnevåg <arve@android.com>
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---
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kernel/sysctl.c | 9 +++++++++
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mm/page_alloc.c | 3 ++-
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2 files changed, 11 insertions(+), 1 deletions(-)
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--- a/kernel/sysctl.c
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+++ b/kernel/sysctl.c
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@@ -77,6 +77,7 @@ extern int suid_dumpable;
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extern char core_pattern[];
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extern int pid_max;
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extern int min_free_kbytes;
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+extern int min_free_order_shift;
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extern int pid_max_min, pid_max_max;
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extern int sysctl_drop_caches;
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extern int percpu_pagelist_fraction;
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@@ -1109,6 +1110,14 @@ static struct ctl_table vm_table[] = {
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.extra1 = &zero,
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},
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{
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+ .ctl_name = CTL_UNNUMBERED,
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+ .procname = "min_free_order_shift",
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+ .data = &min_free_order_shift,
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+ .maxlen = sizeof(min_free_order_shift),
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+ .mode = 0644,
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+ .proc_handler = &proc_dointvec
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+ },
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+ {
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.ctl_name = VM_PERCPU_PAGELIST_FRACTION,
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.procname = "percpu_pagelist_fraction",
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.data = &percpu_pagelist_fraction,
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -119,6 +119,7 @@ static char * const zone_names[MAX_NR_ZO
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};
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int min_free_kbytes = 1024;
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+int min_free_order_shift = 1;
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unsigned long __meminitdata nr_kernel_pages;
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unsigned long __meminitdata nr_all_pages;
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@@ -1253,7 +1254,7 @@ int zone_watermark_ok(struct zone *z, in
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free_pages -= z->free_area[o].nr_free << o;
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/* Require fewer higher order pages to be free */
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- min >>= 1;
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+ min >>= min_free_order_shift;
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if (free_pages <= min)
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return 0;
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