linux-kernel - [PATCH 21/32] fs/aio: aio_wq isn't used in memory reclaim path

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Mon,  3 Jan 2011 14:49:44 +0100
From:	Tejun Heo <tj@...nel.org>
To:	linux-kernel@...r.kernel.org
Cc:	Tejun Heo <tj@...nel.org>, Benjamin LaHaise <bcrl@...ck.org>,
	linux-aio@...ck.org
Subject: [PATCH 21/32] fs/aio: aio_wq isn't used in memory reclaim path

aio_wq isn't used during memory reclaim.  Convert to alloc_workqueue()
without WQ_MEM_RECLAIM.  It's possible to use system_wq but given that
the number of work items is determined from userland and the work item
may block, enforcing strict concurrency limit would be a good idea.

Signed-off-by: Tejun Heo <tj@...nel.org>
Cc: Benjamin LaHaise <bcrl@...ck.org>
Cc: linux-aio@...ck.org
---
Please feel free to take it into the subsystem tree or simply ack -
I'll route it through the wq tree.

Thanks.

 fs/aio.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/aio.c b/fs/aio.c
index 8c8f6c5..dc3fcbb 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -85,7 +85,7 @@ static int __init aio_setup(void)
 	kiocb_cachep = KMEM_CACHE(kiocb, SLAB_HWCACHE_ALIGN|SLAB_PANIC);
 	kioctx_cachep = KMEM_CACHE(kioctx,SLAB_HWCACHE_ALIGN|SLAB_PANIC);
 
-	aio_wq = create_workqueue("aio");
+	aio_wq = alloc_workqueue("aio", 0, 1);	/* used to limit concurrency */
 	abe_pool = mempool_create_kmalloc_pool(1, sizeof(struct aio_batch_entry));
 	BUG_ON(!abe_pool);
 
@@ -569,7 +569,7 @@ static int __aio_put_req(struct kioctx *ctx, struct kiocb *req)
 		spin_lock(&fput_lock);
 		list_add(&req->ki_list, &fput_head);
 		spin_unlock(&fput_lock);
-		queue_work(aio_wq, &fput_work);
+		schedule_work(&fput_work);
 	} else {
 		req->ki_filp = NULL;
 		really_put_req(ctx, req);
-- 
1.7.1

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/