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mempool: kvmalloc pool

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Add mempool_init_kvmalloc_pool() and mempool_create_kvmalloc_pool(),
which wrap kvmalloc() instead of kmalloc() - kmalloc() with a vmalloc()
fallback.

This is part of a bcachefs cleanup - dropping an internal kvpmalloc()
helper (which predates kvmalloc()) along with mempool helpers; this
replaces the bcachefs-private kvpmalloc_pool.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
Cc: linux-mm@kvack.org
This commit is contained in:
Kent Overstreet 2024-02-01 06:28:41 -05:00
parent 737cd174d1
commit 0225bdfafd
2 changed files with 26 additions and 0 deletions
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13
include/linux/mempool.h
View File

@ -95,6 +95,19 @@ static inline mempool_t *mempool_create_kmalloc_pool(int min_nr, size_t size)
(void *) size);
}
void *mempool_kvmalloc(gfp_t gfp_mask, void *pool_data);
void mempool_kvfree(void *element, void *pool_data);
static inline int mempool_init_kvmalloc_pool(mempool_t *pool, int min_nr, size_t size)
{
return mempool_init(pool, min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
}
static inline mempool_t *mempool_create_kvmalloc_pool(int min_nr, size_t size)
{
return mempool_create(min_nr, mempool_kvmalloc, mempool_kvfree, (void *) size);
}
/*
* A mempool_alloc_t and mempool_free_t for a simple page allocator that
* allocates pages of the order specified by pool_data

13
mm/mempool.c
View File

@ -590,6 +590,19 @@ void mempool_kfree(void *element, void *pool_data)
}
EXPORT_SYMBOL(mempool_kfree);
void *mempool_kvmalloc(gfp_t gfp_mask, void *pool_data)
{
size_t size = (size_t)pool_data;
return kvmalloc(size, gfp_mask);
}
EXPORT_SYMBOL(mempool_kvmalloc);
void mempool_kvfree(void *element, void *pool_data)
{
kvfree(element);
}
EXPORT_SYMBOL(mempool_kvfree);
/*
* A simple mempool-backed page allocator that allocates pages
* of the order specified by pool_data.