R0dn3yS/android_kernel_xiaomi_sm7250
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dma_buf: use kmem_cache pool for struct sync_file

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These get allocated and freed millions of times on this kernel tree.

Use a dedicated kmem_cache pool and avoid costly dynamic memory allocations.

Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: Adam W. Willis <return.of.octobot@gmail.com>
This commit is contained in:
Park Ju Hyung 2019-07-12 01:16:18 +09:00 committed by spakkkk
parent 515f0624db
commit 774d7449d5
2 changed files with 11 additions and 3 deletions
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12
drivers/dma-buf/sync_file.c
View File

@ -27,12 +27,18 @@
#include <uapi/linux/sync_file.h>
static const struct file_operations sync_file_fops;
static struct kmem_cache *kmem_sync_file_pool;
void __init init_sync_kmem_pool(void)
{
kmem_sync_file_pool = KMEM_CACHE(sync_file, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
}
static struct sync_file *sync_file_alloc(void)
{
struct sync_file *sync_file;
sync_file = kzalloc(sizeof(*sync_file), GFP_KERNEL);
sync_file = kmem_cache_zalloc(kmem_sync_file_pool, GFP_KERNEL);
if (!sync_file)
return NULL;
@ -48,7 +54,7 @@ static struct sync_file *sync_file_alloc(void)
return sync_file;
err:
kfree(sync_file);
kmem_cache_free(kmem_sync_file_pool, sync_file);
return NULL;
}
@ -277,7 +283,7 @@ static int sync_file_release(struct inode *inode, struct file *file)
if (test_bit(POLL_ENABLED, &sync_file->flags))
dma_fence_remove_callback(sync_file->fence, &sync_file->cb);
dma_fence_put(sync_file->fence);
kfree(sync_file);
kmem_cache_free(kmem_sync_file_pool, sync_file);
return 0;
}

2
init/main.c
View File

@ -554,6 +554,7 @@ static void __init mm_init(void)
pti_init();
}
void __init init_sync_kmem_pool(void);
void __init init_dma_buf_kmem_pool(void);
asmlinkage __visible void __init start_kernel(void)
{
@ -753,6 +754,7 @@ asmlinkage __visible void __init start_kernel(void)
cgroup_init();
taskstats_init_early();
delayacct_init();
init_sync_kmem_pool();
init_dma_buf_kmem_pool();
check_bugs();