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authorNishanth Aravamudan <nacc@us.ibm.com>2011-04-13 19:45:59 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2011-04-18 13:08:08 +1000
commit127493d5dc73589cbe00ea5ec8357cc2a4c0d82a (patch)
treeaae7b2ce16ed3950cf49cd0ad00a5ee780b40344 /arch/powerpc/platforms/pseries/setup.c
parent7c7a81b53e581d727d069cc45df5510516faac31 (diff)
downloadlinaro-lsk-127493d5dc73589cbe00ea5ec8357cc2a4c0d82a.tar.gz
powerpc/pseries: Use a kmem cache for DTL buffers
PAPR specifies that DTL buffers can not cross AMS environments (aka CMO in the PAPR) and can not cross a memory entitlement granule boundary (4k). This is found in section 14.11.3.2 H_REGISTER_VPA of the PAPR. kmalloc does not guarantee an alignment of the allocation, though, beyond 8 bytes (at least in my understanding). Create a special kmem cache for DTL buffers with the alignment requirement. Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/platforms/pseries/setup.c')
-rw-r--r--arch/powerpc/platforms/pseries/setup.c12
1 files changed, 10 insertions, 2 deletions
diff --git a/arch/powerpc/platforms/pseries/setup.c b/arch/powerpc/platforms/pseries/setup.c
index 00072414908..6c42cfde841 100644
--- a/arch/powerpc/platforms/pseries/setup.c
+++ b/arch/powerpc/platforms/pseries/setup.c
@@ -287,14 +287,22 @@ static int alloc_dispatch_logs(void)
int cpu, ret;
struct paca_struct *pp;
struct dtl_entry *dtl;
+ struct kmem_cache *dtl_cache;
if (!firmware_has_feature(FW_FEATURE_SPLPAR))
return 0;
+ dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
+ DISPATCH_LOG_BYTES, 0, NULL);
+ if (!dtl_cache) {
+ pr_warn("Failed to create dispatch trace log buffer cache\n");
+ pr_warn("Stolen time statistics will be unreliable\n");
+ return 0;
+ }
+
for_each_possible_cpu(cpu) {
pp = &paca[cpu];
- dtl = kmalloc_node(DISPATCH_LOG_BYTES, GFP_KERNEL,
- cpu_to_node(cpu));
+ dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
if (!dtl) {
pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
cpu);