/*
* User wants to increase number of threads with for
- * each CPU core/HT, most likely the factor is larger then
+ * each CPU core/HT, most likely the factor is larger than
* one thread/core because service threads are supposed to
* be blocked by lock or wait for IO.
*/
}
/**
- * Put the request to the export list if the request may become
- * a high priority one.
+ * Check if a request should be assigned with a high priority.
+ *
+ * \retval < 0: error occurred
+ * 0: normal RPC request
+ * +1: high priority request
*/
static int ptlrpc_server_hpreq_init(struct ptlrpc_service_part *svcpt,
struct ptlrpc_request *req)
{
- struct list_head *list;
- int rc, hp = 0;
-
+ int rc;
ENTRY;
- if (svcpt->scp_service->srv_ops.so_hpreq_handler) {
+ if (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL) {
rc = svcpt->scp_service->srv_ops.so_hpreq_handler(req);
if (rc < 0)
RETURN(rc);
+
LASSERT(rc == 0);
}
- if (req->rq_export) {
- if (req->rq_ops) {
- /* Perform request specific check. We should do this
- * check before the request is added into exp_hp_rpcs
- * list otherwise it may hit swab race at LU-1044. */
- if (req->rq_ops->hpreq_check) {
- rc = req->rq_ops->hpreq_check(req);
- /**
- * XXX: Out of all current
- * ptlrpc_hpreq_ops::hpreq_check(), only
- * ldlm_cancel_hpreq_check() can return an
- * error code; other functions assert in
- * similar places, which seems odd.
- * What also does not seem right is that
- * handlers for those RPCs do not assert
- * on the same checks, but rather handle the
- * error cases. e.g. see ost_rw_hpreq_check(),
- * and ost_brw_read(), ost_brw_write().
- */
- if (rc < 0)
- RETURN(rc);
- LASSERT(rc == 0 || rc == 1);
- hp = rc;
- }
- list = &req->rq_export->exp_hp_rpcs;
- } else {
- list = &req->rq_export->exp_reg_rpcs;
- }
- /* do search for duplicated xid and the adding to the list
- * atomically */
- spin_lock_bh(&req->rq_export->exp_rpc_lock);
- rc = ptlrpc_server_check_resend_in_progress(req);
- if (rc < 0) {
- spin_unlock_bh(&req->rq_export->exp_rpc_lock);
- RETURN(rc);
+ if (req->rq_export != NULL && req->rq_ops != NULL) {
+ /* Perform request specific check. We should do this
+ * check before the request is added into exp_hp_rpcs
+ * list otherwise it may hit swab race at LU-1044. */
+ if (req->rq_ops->hpreq_check != NULL) {
+ rc = req->rq_ops->hpreq_check(req);
+ LASSERT(rc <= 1); /* can only return error, 0, or 1 */
}
- list_add(&req->rq_exp_list, list);
- spin_unlock_bh(&req->rq_export->exp_rpc_lock);
}
- ptlrpc_nrs_req_initialize(svcpt, req, !!hp);
-
- RETURN(hp);
+ RETURN(rc);
}
/** Remove the request from the export list. */
static int ptlrpc_server_request_add(struct ptlrpc_service_part *svcpt,
struct ptlrpc_request *req)
{
- int rc;
+ int rc;
+ bool hp;
ENTRY;
rc = ptlrpc_server_hpreq_init(svcpt, req);
if (rc < 0)
RETURN(rc);
+ hp = rc > 0;
+ ptlrpc_nrs_req_initialize(svcpt, req, hp);
+
+ if (req->rq_export != NULL) {
+ struct obd_export *exp = req->rq_export;
+
+ /* do search for duplicated xid and the adding to the list
+ * atomically */
+ spin_lock_bh(&exp->exp_rpc_lock);
+ rc = ptlrpc_server_check_resend_in_progress(req);
+ if (rc < 0) {
+ spin_unlock_bh(&exp->exp_rpc_lock);
+
+ ptlrpc_nrs_req_finalize(req);
+ RETURN(rc);
+ }
+
+ if (hp || req->rq_ops != NULL)
+ list_add(&req->rq_exp_list, &exp->exp_hp_rpcs);
+ else
+ list_add(&req->rq_exp_list, &exp->exp_reg_rpcs);
+ spin_unlock_bh(&exp->exp_rpc_lock);
+ }
+
/* the current thread is not the processing thread for this request
* since that, but request is in exp_hp_list and can be find there.
* Remove all relations between request and old thread. */
req->rq_svc_thread = NULL;
req->rq_session.lc_thread = NULL;
- ptlrpc_nrs_req_add(svcpt, req, !!rc);
+ ptlrpc_nrs_req_add(svcpt, req, hp);
RETURN(0);
}
goto err_req;
}
- switch(lustre_msg_get_opc(req->rq_reqmsg)) {
- case MDS_WRITEPAGE:
- case OST_WRITE:
- req->rq_bulk_write = 1;
- break;
- case MDS_READPAGE:
- case OST_READ:
- case MGS_CONFIG_READ:
- req->rq_bulk_read = 1;
- break;
- }
+ switch (lustre_msg_get_opc(req->rq_reqmsg)) {
+ case MDS_WRITEPAGE:
+ case OST_WRITE:
+ case OUT_UPDATE:
+ req->rq_bulk_write = 1;
+ break;
+ case MDS_READPAGE:
+ case OST_READ:
+ case MGS_CONFIG_READ:
+ req->rq_bulk_read = 1;
+ break;
+ }
CDEBUG(D_RPCTRACE, "got req x"LPU64"\n", req->rq_xid);
static inline int
ptlrpc_threads_enough(struct ptlrpc_service_part *svcpt)
{
- return (svcpt->scp_nthrs_running >=
- svcpt->scp_service->srv_nthrs_cpt_init) &&
- (svcpt->scp_nreqs_active <
- svcpt->scp_nthrs_running - 1 -
- (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL));
+ return svcpt->scp_nreqs_active <
+ svcpt->scp_nthrs_running - 1 -
+ (svcpt->scp_service->srv_ops.so_hpreq_handler != NULL);
}
/**
git://git.whamcloud.com / fs / lustre-release.git / blobdiff