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Subject[PATCH] ext4: slab caches set to SLAB_MEM_SPREAD flags.
Date
If slab caches set to SLAB_MEM_SPREAD flags, The allocation is spread evenly over all the memory nodes instead of favoring allocation on the node local to current cpu.

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Amit Sahrawat <amit.sahrawat83@gmail.com>
---
fs/ext4/mballoc.c | 9 +++++----
fs/ext4/page-io.c | 6 ++++--
2 files changed, 9 insertions(+), 6 deletions(-)

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index e2d8be8..86efde7 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2407,7 +2407,8 @@ static int ext4_groupinfo_create_slab(size_t size)
bb_counters[blocksize_bits + 2]);

cachep = kmem_cache_create(ext4_groupinfo_slab_names[cache_index],
- slab_size, 0, SLAB_RECLAIM_ACCOUNT,
+ slab_size, 0, SLAB_RECLAIM_ACCOUNT |
+ SLAB_MEM_SPREAD,
NULL);

ext4_groupinfo_caches[cache_index] = cachep;
@@ -2730,19 +2731,19 @@ static void ext4_remove_debugfs_entry(void)
int __init ext4_init_mballoc(void)
{
ext4_pspace_cachep = KMEM_CACHE(ext4_prealloc_space,
- SLAB_RECLAIM_ACCOUNT);
+ SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD);
if (ext4_pspace_cachep == NULL)
return -ENOMEM;

ext4_ac_cachep = KMEM_CACHE(ext4_allocation_context,
- SLAB_RECLAIM_ACCOUNT);
+ SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD);
if (ext4_ac_cachep == NULL) {
kmem_cache_destroy(ext4_pspace_cachep);
return -ENOMEM;
}

ext4_free_ext_cachep = KMEM_CACHE(ext4_free_data,
- SLAB_RECLAIM_ACCOUNT);
+ SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD);
if (ext4_free_ext_cachep == NULL) {
kmem_cache_destroy(ext4_pspace_cachep);
kmem_cache_destroy(ext4_ac_cachep);
diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 7ce1d0b..4f848e0 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -34,10 +34,12 @@ static struct kmem_cache *io_page_cachep, *io_end_cachep;

int __init ext4_init_pageio(void)
{
- io_page_cachep = KMEM_CACHE(ext4_io_page, SLAB_RECLAIM_ACCOUNT);
+ io_page_cachep = KMEM_CACHE(ext4_io_page, SLAB_RECLAIM_ACCOUNT |
+ SLAB_MEM_SPREAD);
if (io_page_cachep == NULL)
return -ENOMEM;
- io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT);
+ io_end_cachep = KMEM_CACHE(ext4_io_end, SLAB_RECLAIM_ACCOUNT |
+ SLAB_MEM_SPREAD);
if (io_end_cachep == NULL) {
kmem_cache_destroy(io_page_cachep);
return -ENOMEM;
--
1.7.4.4


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