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Date: Fri, 15 Oct 2010 13:11:33 -0400
From: "J. Bruce Fields" <bfields@...ldses.org>
To: Tejun Heo <tj@...nel.org>
Cc: Trond Myklebust <Trond.Myklebust@...app.com>,
linux-nfs@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
Tom Tucker <tom@....us>
Subject: Re: [PATCH linux-2.6.36-rc7] sunrpc/xprtrdma: clean up workqueue
usage
Tom, could you take a look?
--b.
On Fri, Oct 15, 2010 at 05:49:27PM +0200, Tejun Heo wrote:
> * Create and use svc_rdma_wq instead of using the system workqueue and
> flush_scheduled_work(). This workqueue is necessary to serve as
> flushing domain for rdma->sc_work which is used to destroy itself
> and thus can't be flushed explicitly.
>
> * Replace cancel_delayed_work() + flush_scheduled_work() with
> cancel_delayed_work_sync().
>
> * Implement synchronous connect in xprt_rdma_connect() using
> flush_delayed_work() on the rdma_connect work instead of using
> flush_scheduled_work().
>
> This is to prepare for the deprecation and removal of
> flush_scheduled_work().
>
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
> net/sunrpc/xprtrdma/svc_rdma.c | 11 ++++++++++-
> net/sunrpc/xprtrdma/svc_rdma_transport.c | 6 +++++-
> net/sunrpc/xprtrdma/transport.c | 5 ++---
> 3 files changed, 17 insertions(+), 5 deletions(-)
>
> Index: work/net/sunrpc/xprtrdma/svc_rdma.c
> ===================================================================
> --- work.orig/net/sunrpc/xprtrdma/svc_rdma.c
> +++ work/net/sunrpc/xprtrdma/svc_rdma.c
> @@ -43,6 +43,7 @@
> #include <linux/slab.h>
> #include <linux/fs.h>
> #include <linux/sysctl.h>
> +#include <linux/workqueue.h>
> #include <linux/sunrpc/clnt.h>
> #include <linux/sunrpc/sched.h>
> #include <linux/sunrpc/svc_rdma.h>
> @@ -74,6 +75,8 @@ atomic_t rdma_stat_sq_prod;
> struct kmem_cache *svc_rdma_map_cachep;
> struct kmem_cache *svc_rdma_ctxt_cachep;
>
> +struct workqueue_struct *svc_rdma_wq;
> +
> /*
> * This function implements reading and resetting an atomic_t stat
> * variable through read/write to a proc file. Any write to the file
> @@ -231,7 +234,7 @@ static ctl_table svcrdma_root_table[] =
> void svc_rdma_cleanup(void)
> {
> dprintk("SVCRDMA Module Removed, deregister RPC RDMA transport\n");
> - flush_scheduled_work();
> + destroy_workqueue(svc_rdma_wq);
> if (svcrdma_table_header) {
> unregister_sysctl_table(svcrdma_table_header);
> svcrdma_table_header = NULL;
> @@ -249,6 +252,11 @@ int svc_rdma_init(void)
> dprintk("\tsq_depth : %d\n",
> svcrdma_max_requests * RPCRDMA_SQ_DEPTH_MULT);
> dprintk("\tmax_inline : %d\n", svcrdma_max_req_size);
> +
> + svc_rdma_wq = alloc_workqueue("svc_rdma", 0, 0);
> + if (!svc_rdma_wq)
> + return -ENOMEM;
> +
> if (!svcrdma_table_header)
> svcrdma_table_header =
> register_sysctl_table(svcrdma_root_table);
> @@ -283,6 +291,7 @@ int svc_rdma_init(void)
> kmem_cache_destroy(svc_rdma_map_cachep);
> err0:
> unregister_sysctl_table(svcrdma_table_header);
> + destroy_workqueue(svc_rdma_wq);
> return -ENOMEM;
> }
> MODULE_AUTHOR("Tom Tucker <tom@...ngridcomputing.com>");
> Index: work/net/sunrpc/xprtrdma/svc_rdma_transport.c
> ===================================================================
> --- work.orig/net/sunrpc/xprtrdma/svc_rdma_transport.c
> +++ work/net/sunrpc/xprtrdma/svc_rdma_transport.c
> @@ -45,6 +45,7 @@
> #include <linux/sched.h>
> #include <linux/slab.h>
> #include <linux/spinlock.h>
> +#include <linux/workqueue.h>
> #include <rdma/ib_verbs.h>
> #include <rdma/rdma_cm.h>
> #include <linux/sunrpc/svc_rdma.h>
> @@ -89,6 +90,9 @@ struct svc_xprt_class svc_rdma_class = {
> /* WR context cache. Created in svc_rdma.c */
> extern struct kmem_cache *svc_rdma_ctxt_cachep;
>
> +/* Workqueue created in svc_rdma.c */
> +extern struct workqueue_struct *svc_rdma_wq;
> +
> struct svc_rdma_op_ctxt *svc_rdma_get_context(struct svcxprt_rdma *xprt)
> {
> struct svc_rdma_op_ctxt *ctxt;
> @@ -1184,7 +1188,7 @@ static void svc_rdma_free(struct svc_xpr
> struct svcxprt_rdma *rdma =
> container_of(xprt, struct svcxprt_rdma, sc_xprt);
> INIT_WORK(&rdma->sc_work, __svc_rdma_free);
> - schedule_work(&rdma->sc_work);
> + queue_work(svc_rdma_wq, &rdma->sc_work);
> }
>
> static int svc_rdma_has_wspace(struct svc_xprt *xprt)
> Index: work/net/sunrpc/xprtrdma/transport.c
> ===================================================================
> --- work.orig/net/sunrpc/xprtrdma/transport.c
> +++ work/net/sunrpc/xprtrdma/transport.c
> @@ -237,8 +237,7 @@ xprt_rdma_destroy(struct rpc_xprt *xprt)
>
> dprintk("RPC: %s: called\n", __func__);
>
> - cancel_delayed_work(&r_xprt->rdma_connect);
> - flush_scheduled_work();
> + cancel_delayed_work_sync(&r_xprt->rdma_connect);
>
> xprt_clear_connected(xprt);
>
> @@ -460,7 +459,7 @@ xprt_rdma_connect(struct rpc_task *task)
> } else {
> schedule_delayed_work(&r_xprt->rdma_connect, 0);
> if (!RPC_IS_ASYNC(task))
> - flush_scheduled_work();
> + flush_delayed_work(&r_xprt->rdma_connect);
> }
> }
>
> --
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