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SUNRPC: switchable buffer allocation

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Add RPC client transport switch support for replacing buffer management
 on a per-transport basis.

 In the current IPv4 socket transport implementation, RPC buffers are
 allocated as needed for each RPC message that is sent.  Some transport
 implementations may choose to use pre-allocated buffers for encoding,
 sending, receiving, and unmarshalling RPC messages, however.  For
 transports capable of direct data placement, the buffers can be carved
 out of a pre-registered area of memory rather than from a slab cache.

 Test-plan:
 Millions of fsx operations.  Performance characterization with "sio" and
 "iozone".  Use oprofile and other tools to look for significant regression
 in CPU utilization.

 Signed-off-by: Chuck Lever <cel@netapp.com>
 Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Chuck Lever
2006-01-03 09:55:49 +01:00
committed by Trond Myklebust
parent 03c2173393
commit 0210714834
6 changed files with 49 additions and 36 deletions
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50
net/sunrpc/sched.c
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@@ -41,8 +41,6 @@ static mempool_t *rpc_buffer_mempool __read_mostly;
static void __rpc_default_timer(struct rpc_task *task);
static void rpciod_killall(void);
static void rpc_free(struct rpc_task *task);
static void rpc_async_schedule(void *);
/*
@@ -599,7 +597,6 @@ void rpc_exit_task(struct rpc_task *task)
WARN_ON(RPC_ASSASSINATED(task));
/* Always release the RPC slot and buffer memory */
xprt_release(task);
rpc_free(task);
}
}
}
@@ -724,17 +721,19 @@ static void rpc_async_schedule(void *arg)
__rpc_execute((struct rpc_task *)arg);
}
/*
* Allocate memory for RPC purposes.
/**
* rpc_malloc - allocate an RPC buffer
* @task: RPC task that will use this buffer
* @size: requested byte size
*
* We try to ensure that some NFS reads and writes can always proceed
* by using a mempool when allocating 'small' buffers.
* In order to avoid memory starvation triggering more writebacks of
* NFS requests, we use GFP_NOFS rather than GFP_KERNEL.
*/
void *
rpc_malloc(struct rpc_task *task, size_t size)
void * rpc_malloc(struct rpc_task *task, size_t size)
{
struct rpc_rqst *req = task->tk_rqstp;
gfp_t gfp;
if (task->tk_flags & RPC_TASK_SWAPPER)
@@ -743,27 +742,33 @@ rpc_malloc(struct rpc_task *task, size_t size)
gfp = GFP_NOFS;
if (size > RPC_BUFFER_MAXSIZE) {
task->tk_buffer = kmalloc(size, gfp);
if (task->tk_buffer)
task->tk_bufsize = size;
req->rq_buffer = kmalloc(size, gfp);
if (req->rq_buffer)
req->rq_bufsize = size;
} else {
task->tk_buffer = mempool_alloc(rpc_buffer_mempool, gfp);
if (task->tk_buffer)
task->tk_bufsize = RPC_BUFFER_MAXSIZE;
req->rq_buffer = mempool_alloc(rpc_buffer_mempool, gfp);
if (req->rq_buffer)
req->rq_bufsize = RPC_BUFFER_MAXSIZE;
}
return task->tk_buffer;
return req->rq_buffer;
}
static void
rpc_free(struct rpc_task *task)
/**
* rpc_free - free buffer allocated via rpc_malloc
* @task: RPC task with a buffer to be freed
*
*/
void rpc_free(struct rpc_task *task)
{
if (task->tk_buffer) {
if (task->tk_bufsize == RPC_BUFFER_MAXSIZE)
mempool_free(task->tk_buffer, rpc_buffer_mempool);
struct rpc_rqst *req = task->tk_rqstp;
if (req->rq_buffer) {
if (req->rq_bufsize == RPC_BUFFER_MAXSIZE)
mempool_free(req->rq_buffer, rpc_buffer_mempool);
else
kfree(task->tk_buffer);
task->tk_buffer = NULL;
task->tk_bufsize = 0;
kfree(req->rq_buffer);
req->rq_buffer = NULL;
req->rq_bufsize = 0;
}
}
@@ -887,7 +892,6 @@ void rpc_release_task(struct rpc_task *task)
xprt_release(task);
if (task->tk_msg.rpc_cred)
rpcauth_unbindcred(task);
rpc_free(task);
if (task->tk_client) {
rpc_release_client(task->tk_client);
task->tk_client = NULL;