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| author | Paul Szabo <psz@maths.usyd.edu.au> | 2013-02-23 04:34:42 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-24 05:50:17 +0400 |
| commit | 75f7ad8e043d9383337d917584297f7737154bbf (patch) | |
| tree | 101f5f2373b615bf83838cd13615fd123dfd765c | |
| parent | 08b52706d505658eac0962d215ff697f898bbc13 (diff) | |
| download | linux-75f7ad8e043d9383337d917584297f7737154bbf.tar.xz | |
page-writeback.c: subtract min_free_kbytes from dirtyable memory
When calculating amount of dirtyable memory, min_free_kbytes should be
subtracted because it is not intended for dirty pages.
Addresses http://bugs.debian.org/695182
[akpm@linux-foundation.org: fix up min_free_kbytes extern declarations]
[akpm@linux-foundation.org: fix min() warning]
Signed-off-by: Paul Szabo <psz@maths.usyd.edu.au>
Acked-by: Rik van Riel <riel@redhat.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/mm.h | 3 | ||||
| -rw-r--r-- | kernel/sysctl.c | 1 | ||||
| -rw-r--r-- | mm/huge_memory.c | 1 | ||||
| -rw-r--r-- | mm/page-writeback.c | 3 |
4 files changed, 6 insertions, 2 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 1d4122bf6f27..437da0ce78c7 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1393,6 +1393,9 @@ extern void setup_per_cpu_pageset(void); extern void zone_pcp_update(struct zone *zone); extern void zone_pcp_reset(struct zone *zone); +/* page_alloc.c */ +extern int min_free_kbytes; + /* nommu.c */ extern atomic_long_t mmap_pages_allocated; extern int nommu_shrink_inode_mappings(struct inode *, size_t, size_t); diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 467d8b923fcd..95e9e55602a8 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -105,7 +105,6 @@ extern char core_pattern[]; extern unsigned int core_pipe_limit; #endif extern int pid_max; -extern int min_free_kbytes; extern int pid_max_min, pid_max_max; extern int sysctl_drop_caches; extern int percpu_pagelist_fraction; diff --git a/mm/huge_memory.c b/mm/huge_memory.c index b1cc6591ed83..c63a21d0e991 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -105,7 +105,6 @@ static int set_recommended_min_free_kbytes(void) struct zone *zone; int nr_zones = 0; unsigned long recommended_min; - extern int min_free_kbytes; if (!khugepaged_enabled()) return 0; diff --git a/mm/page-writeback.c b/mm/page-writeback.c index 7300c9d5e1d9..cdc377c456c0 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -241,6 +241,9 @@ static unsigned long global_dirtyable_memory(void) if (!vm_highmem_is_dirtyable) x -= highmem_dirtyable_memory(x); + /* Subtract min_free_kbytes */ + x -= min_t(unsigned long, x, min_free_kbytes >> (PAGE_SHIFT - 10)); + return x + 1; /* Ensure that we never return 0 */ } |