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authorJohannes Weiner <hannes@saeurebad.de>2008-07-23 21:28:07 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-24 10:47:20 -0700
commit0f3caba211babef6e3fbde1ba76ddc79321bc92f (patch)
treea240561bc4288ab3e17f16c458377df9d043a177 /mm/bootmem.c
parente2bf3cae515090fefe28329e71230dfe7ab873b1 (diff)
downloadop-kernel-dev-0f3caba211babef6e3fbde1ba76ddc79321bc92f.zip
op-kernel-dev-0f3caba211babef6e3fbde1ba76ddc79321bc92f.tar.gz
bootmem: respect goal more likely
The old node-agnostic code tried allocating on all nodes starting from the one with the lowest range. alloc_bootmem_core retried without the goal if it could not satisfy it and so the goal was only respected at all when it happened to be on the first (lowest page numbers) node (or theoretically if allocations failed on all nodes before to the one holding the goal). Introduce a non-panicking helper that starts allocating from the node holding the goal and falls back only after all thes tries failed, thus moving the goal fallback code out of alloc_bootmem_core. Make all other allocation functions benefit from this new helper. Signed-off-by: Johannes Weiner <hannes@saeurebad.de> Cc: Ingo Molnar <mingo@elte.hu> Cc: Yinghai Lu <yhlu.kernel@gmail.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/bootmem.c')
-rw-r--r--mm/bootmem.c92
1 files changed, 54 insertions, 38 deletions
diff --git a/mm/bootmem.c b/mm/bootmem.c
index e5415a5..89646f7 100644
--- a/mm/bootmem.c
+++ b/mm/bootmem.c
@@ -408,6 +408,7 @@ static void * __init alloc_bootmem_core(struct bootmem_data *bdata,
unsigned long size, unsigned long align,
unsigned long goal, unsigned long limit)
{
+ unsigned long fallback = 0;
unsigned long min, max, start, sidx, midx, step;
BUG_ON(!size);
@@ -443,8 +444,11 @@ static void * __init alloc_bootmem_core(struct bootmem_data *bdata,
midx = max - PFN_DOWN(bdata->node_boot_start);
if (bdata->hint_idx > sidx) {
- /* Make sure we retry on failure */
- goal = 1;
+ /*
+ * Handle the valid case of sidx being zero and still
+ * catch the fallback below.
+ */
+ fallback = sidx + 1;
sidx = ALIGN(bdata->hint_idx, step);
}
@@ -492,10 +496,39 @@ find_block:
return region;
}
+ if (fallback) {
+ sidx = ALIGN(fallback - 1, step);
+ fallback = 0;
+ goto find_block;
+ }
+
+ return NULL;
+}
+
+static void * __init ___alloc_bootmem_nopanic(unsigned long size,
+ unsigned long align,
+ unsigned long goal,
+ unsigned long limit)
+{
+ bootmem_data_t *bdata;
+
+restart:
+ list_for_each_entry(bdata, &bdata_list, list) {
+ void *region;
+
+ if (goal && bdata->node_low_pfn <= PFN_DOWN(goal))
+ continue;
+ if (limit && bdata->node_boot_start >= limit)
+ break;
+
+ region = alloc_bootmem_core(bdata, size, align, goal, limit);
+ if (region)
+ return region;
+ }
+
if (goal) {
goal = 0;
- sidx = 0;
- goto find_block;
+ goto restart;
}
return NULL;
@@ -515,16 +548,23 @@ find_block:
* Returns NULL on failure.
*/
void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
- unsigned long goal)
+ unsigned long goal)
{
- bootmem_data_t *bdata;
- void *ptr;
+ return ___alloc_bootmem_nopanic(size, align, goal, 0);
+}
- list_for_each_entry(bdata, &bdata_list, list) {
- ptr = alloc_bootmem_core(bdata, size, align, goal, 0);
- if (ptr)
- return ptr;
- }
+static void * __init ___alloc_bootmem(unsigned long size, unsigned long align,
+ unsigned long goal, unsigned long limit)
+{
+ void *mem = ___alloc_bootmem_nopanic(size, align, goal, limit);
+
+ if (mem)
+ return mem;
+ /*
+ * Whoops, we cannot satisfy the allocation request.
+ */
+ printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
+ panic("Out of memory");
return NULL;
}
@@ -544,16 +584,7 @@ void * __init __alloc_bootmem_nopanic(unsigned long size, unsigned long align,
void * __init __alloc_bootmem(unsigned long size, unsigned long align,
unsigned long goal)
{
- void *mem = __alloc_bootmem_nopanic(size,align,goal);
-
- if (mem)
- return mem;
- /*
- * Whoops, we cannot satisfy the allocation request.
- */
- printk(KERN_ALERT "bootmem alloc of %lu bytes failed!\n", size);
- panic("Out of memory");
- return NULL;
+ return ___alloc_bootmem(size, align, goal, 0);
}
/**
@@ -653,22 +684,7 @@ void * __init __alloc_bootmem_node_nopanic(pg_data_t *pgdat, unsigned long size,
void * __init __alloc_bootmem_low(unsigned long size, unsigned long align,
unsigned long goal)
{
- bootmem_data_t *bdata;
- void *ptr;
-
- list_for_each_entry(bdata, &bdata_list, list) {
- ptr = alloc_bootmem_core(bdata, size, align, goal,
- ARCH_LOW_ADDRESS_LIMIT);
- if (ptr)
- return ptr;
- }
-
- /*
- * Whoops, we cannot satisfy the allocation request.
- */
- printk(KERN_ALERT "low bootmem alloc of %lu bytes failed!\n", size);
- panic("Out of low memory");
- return NULL;
+ return ___alloc_bootmem(size, align, goal, ARCH_LOW_ADDRESS_LIMIT);
}
/**
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