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authorJens Axboe <jaxboe@fusionio.com>2011-03-02 20:12:18 -0500
committerJens Axboe <jaxboe@fusionio.com>2011-03-10 08:52:27 +0100
commitcf15900e1209d5b46ec2d24643adbf561830935f (patch)
treef66ed809657402d7c0a082b19a1a64745b604fe7 /fs/aio.c
parent9f5b9425468c85a901d863d241ba5c5dff9b23b8 (diff)
downloadlinux-stericsson-cf15900e1209d5b46ec2d24643adbf561830935f.tar.gz
aio: remove request submission batching
This should be useless now that we have on-stack plugging. So lets just kill it. Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'fs/aio.c')
-rw-r--r--fs/aio.c75
1 files changed, 3 insertions, 72 deletions
diff --git a/fs/aio.c b/fs/aio.c
index 1476bed1c5fb..020de5cb4a67 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -34,8 +34,6 @@
#include <linux/security.h>
#include <linux/eventfd.h>
#include <linux/blkdev.h>
-#include <linux/mempool.h>
-#include <linux/hash.h>
#include <linux/compat.h>
#include <asm/kmap_types.h>
@@ -65,14 +63,6 @@ static DECLARE_WORK(fput_work, aio_fput_routine);
static DEFINE_SPINLOCK(fput_lock);
static LIST_HEAD(fput_head);
-#define AIO_BATCH_HASH_BITS 3 /* allocated on-stack, so don't go crazy */
-#define AIO_BATCH_HASH_SIZE (1 << AIO_BATCH_HASH_BITS)
-struct aio_batch_entry {
- struct hlist_node list;
- struct address_space *mapping;
-};
-mempool_t *abe_pool;
-
static void aio_kick_handler(struct work_struct *);
static void aio_queue_work(struct kioctx *);
@@ -86,8 +76,7 @@ static int __init aio_setup(void)
kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC);
aio_wq = create_workqueue("aio");
- abe_pool = mempool_create_kmalloc_pool(1, sizeof(struct aio_batch_entry));
- BUG_ON(!aio_wq || !abe_pool);
+ BUG_ON(!aio_wq);
pr_debug("aio_setup: sizeof(struct page) = %d\n", (int)sizeof(struct page));
@@ -1512,59 +1501,8 @@ static ssize_t aio_setup_iocb(struct kiocb *kiocb, bool compat)
return 0;
}
-static void aio_batch_add(struct address_space *mapping,
- struct hlist_head *batch_hash)
-{
- struct aio_batch_entry *abe;
- struct hlist_node *pos;
- unsigned bucket;
-
- bucket = hash_ptr(mapping, AIO_BATCH_HASH_BITS);
- hlist_for_each_entry(abe, pos, &batch_hash[bucket], list) {
- if (abe->mapping == mapping)
- return;
- }
-
- abe = mempool_alloc(abe_pool, GFP_KERNEL);
-
- /*
- * we should be using igrab here, but
- * we don't want to hammer on the global
- * inode spinlock just to take an extra
- * reference on a file that we must already
- * have a reference to.
- *
- * When we're called, we always have a reference
- * on the file, so we must always have a reference
- * on the inode, so ihold() is safe here.
- */
- ihold(mapping->host);
- abe->mapping = mapping;
- hlist_add_head(&abe->list, &batch_hash[bucket]);
- return;
-}
-
-static void aio_batch_free(struct hlist_head *batch_hash)
-{
- struct aio_batch_entry *abe;
- struct hlist_node *pos, *n;
- int i;
-
- /*
- * TODO: kill this
- */
- for (i = 0; i < AIO_BATCH_HASH_SIZE; i++) {
- hlist_for_each_entry_safe(abe, pos, n, &batch_hash[i], list) {
- iput(abe->mapping->host);
- hlist_del(&abe->list);
- mempool_free(abe, abe_pool);
- }
- }
-}
-
static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
- struct iocb *iocb, struct hlist_head *batch_hash,
- bool compat)
+ struct iocb *iocb, bool compat)
{
struct kiocb *req;
struct file *file;
@@ -1638,11 +1576,6 @@ static int io_submit_one(struct kioctx *ctx, struct iocb __user *user_iocb,
;
}
spin_unlock_irq(&ctx->ctx_lock);
- if (req->ki_opcode == IOCB_CMD_PREAD ||
- req->ki_opcode == IOCB_CMD_PREADV ||
- req->ki_opcode == IOCB_CMD_PWRITE ||
- req->ki_opcode == IOCB_CMD_PWRITEV)
- aio_batch_add(file->f_mapping, batch_hash);
aio_put_req(req); /* drop extra ref to req */
return 0;
@@ -1659,7 +1592,6 @@ long do_io_submit(aio_context_t ctx_id, long nr,
struct kioctx *ctx;
long ret = 0;
int i;
- struct hlist_head batch_hash[AIO_BATCH_HASH_SIZE] = { { 0, }, };
struct blk_plug plug;
if (unlikely(nr < 0))
@@ -1697,12 +1629,11 @@ long do_io_submit(aio_context_t ctx_id, long nr,
break;
}
- ret = io_submit_one(ctx, user_iocb, &tmp, batch_hash, compat);
+ ret = io_submit_one(ctx, user_iocb, &tmp, compat);
if (ret)
break;
}
blk_finish_plug(&plug);
- aio_batch_free(batch_hash);
put_ioctx(ctx);
return i ? i : ret;