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bcache: Don't call sysconf for every io

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This commit is contained in:
Joe Thornber 2018-05-17 10:05:10 +01:00
parent 7ee0a6e44d
commit 5052970da3
1 changed files with 6 additions and 5 deletions
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11
lib/device/bcache.c
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@ -133,6 +133,7 @@ struct async_engine {
struct io_engine e; struct io_engine e;
io_context_t aio_context; io_context_t aio_context;
struct cb_set *cbs; struct cb_set *cbs;
unsigned page_mask;
}; };
static struct async_engine *_to_async(struct io_engine *e) static struct async_engine *_to_async(struct io_engine *e)
@ -162,9 +163,8 @@ static bool _async_issue(struct io_engine *ioe, enum dir d, int fd,
struct iocb *cb_array[1]; struct iocb *cb_array[1];
struct control_block *cb; struct control_block *cb;
struct async_engine *e = _to_async(ioe); struct async_engine *e = _to_async(ioe);
long pgsize = sysconf(_SC_PAGESIZE);
if (((uintptr_t) data) & (pgsize - 1)) { if (((uintptr_t) data) & e->page_mask) {
log_warn("misaligned data buffer"); log_warn("misaligned data buffer");
return false; return false;
} }
@ -276,6 +276,8 @@ struct io_engine *create_async_io_engine(void)
return NULL; return NULL;
} }
e->page_mask = sysconf(_SC_PAGESIZE) - 1;
return &e->e; return &e->e;
} }
@ -544,11 +546,10 @@ static void _hash_table_exit(struct bcache *cache)
//---------------------------------------------------------------- //----------------------------------------------------------------
static bool _init_free_list(struct bcache *cache, unsigned count) static bool _init_free_list(struct bcache *cache, unsigned count, unsigned pgsize)
{ {
unsigned i; unsigned i;
size_t block_size = cache->block_sectors << SECTOR_SHIFT; size_t block_size = cache->block_sectors << SECTOR_SHIFT;
long pgsize = sysconf(_SC_PAGESIZE);
unsigned char *data = unsigned char *data =
(unsigned char *) _alloc_aligned(count * block_size, pgsize); (unsigned char *) _alloc_aligned(count * block_size, pgsize);
@ -949,7 +950,7 @@ struct bcache *bcache_create(sector_t block_sectors, unsigned nr_cache_blocks,
cache->write_misses = 0; cache->write_misses = 0;
cache->prefetches = 0; cache->prefetches = 0;
if (!_init_free_list(cache, nr_cache_blocks)) { if (!_init_free_list(cache, nr_cache_blocks, pgsize)) {
cache->engine->destroy(cache->engine); cache->engine->destroy(cache->engine);
_hash_table_exit(cache); _hash_table_exit(cache);
dm_free(cache); dm_free(cache);