[lustre-devel] [PATCH 050/124] staging: lustre: ldlm: per-export lock callback timeout
James Simmons
jsimmons at infradead.org
Sun Sep 18 13:37:49 PDT 2016
From: Vitaly Fertman <vitaly_fertman at xyratex.com>
The lock callback timeout is calculated as an average per namespace.
This does not reflect individual client behavior.
Instead, we should calculate it on a per-export basis.
This is the client side changes for upstream client.
Signed-off-by: Vitaly Fertman <vitaly_fertman at xyratex.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-4942
Reviewed-by: Andriy Skulysh <Andriy_Skulysh at xyratex.com>
Reviewed-by: Alexey Lyashkov <Alexey_Lyashkov at xyratex.com>
Xyratex-bug-id: MRP-417
Reviewed-on: http://review.whamcloud.com/9336
Reviewed-by: Oleg Drokin <oleg.drokin at intel.com>
Reviewed-by: James Simmons <uja.ornl at gmail.com>
Signed-off-by: James Simmons <jsimmons at infradead.org>
---
drivers/staging/lustre/lustre/ldlm/ldlm_internal.h | 2 +-
drivers/staging/lustre/lustre/ldlm/ldlm_lock.c | 2 -
drivers/staging/lustre/lustre/ldlm/ldlm_request.c | 54 ++++++++++++--------
3 files changed, 33 insertions(+), 25 deletions(-)
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_internal.h b/drivers/staging/lustre/lustre/ldlm/ldlm_internal.h
index dc0e4af..6536832 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_internal.h
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_internal.h
@@ -102,7 +102,7 @@ int ldlm_cancel_lru(struct ldlm_namespace *ns, int nr,
int ldlm_cancel_lru_local(struct ldlm_namespace *ns,
struct list_head *cancels, int count, int max,
enum ldlm_cancel_flags cancel_flags, int flags);
-extern int ldlm_enqueue_min;
+extern unsigned int ldlm_enqueue_min;
/* ldlm_resource.c */
int ldlm_resource_putref_locked(struct ldlm_resource *res);
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
index f516106..3c48b4f 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_lock.c
@@ -1541,8 +1541,6 @@ enum ldlm_error ldlm_lock_enqueue(struct ldlm_namespace *ns,
struct ldlm_lock *lock = *lockp;
struct ldlm_resource *res = lock->l_resource;
- lock->l_last_activity = ktime_get_real_seconds();
-
lock_res_and_lock(lock);
if (lock->l_req_mode == lock->l_granted_mode) {
/* The server returned a blocked lock, but it was granted
diff --git a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
index cc835cb..46842dd 100644
--- a/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
+++ b/drivers/staging/lustre/lustre/ldlm/ldlm_request.c
@@ -63,8 +63,8 @@
#include "ldlm_internal.h"
-int ldlm_enqueue_min = OBD_TIMEOUT_DEFAULT;
-module_param(ldlm_enqueue_min, int, 0644);
+unsigned int ldlm_enqueue_min = OBD_TIMEOUT_DEFAULT;
+module_param(ldlm_enqueue_min, uint, 0644);
MODULE_PARM_DESC(ldlm_enqueue_min, "lock enqueue timeout minimum");
/* in client side, whether the cached locks will be canceled before replay */
@@ -123,44 +123,56 @@ static int ldlm_expired_completion_wait(void *data)
return 0;
}
+/**
+ * Calculate the Completion timeout (covering enqueue, BL AST, data flush,
+ * lock cancel, and their replies). Used for lock completion timeout on the
+ * client side.
+ *
+ * \param[in] lock lock which is waiting the completion callback
+ *
+ * \retval timeout in seconds to wait for the server reply
+ */
/* We use the same basis for both server side and client side functions
* from a single node.
*/
-static int ldlm_get_enq_timeout(struct ldlm_lock *lock)
+static unsigned int ldlm_cp_timeout(struct ldlm_lock *lock)
{
- int timeout = at_get(ldlm_lock_to_ns_at(lock));
+ unsigned int timeout;
if (AT_OFF)
- return obd_timeout / 2;
- /* Since these are non-updating timeouts, we should be conservative.
- * It would be nice to have some kind of "early reply" mechanism for
- * lock callbacks too...
+ return obd_timeout;
+
+ /*
+ * Wait a long time for enqueue - server may have to callback a
+ * lock from another client. Server will evict the other client if it
+ * doesn't respond reasonably, and then give us the lock.
*/
- timeout = min_t(int, at_max, timeout + (timeout >> 1)); /* 150% */
- return max(timeout, ldlm_enqueue_min);
+ timeout = at_get(ldlm_lock_to_ns_at(lock));
+ return max(3 * timeout, ldlm_enqueue_min);
}
/**
* Helper function for ldlm_completion_ast(), updating timings when lock is
* actually granted.
*/
-static int ldlm_completion_tail(struct ldlm_lock *lock)
+static int ldlm_completion_tail(struct ldlm_lock *lock, void *data)
{
long delay;
- int result;
+ int result = 0;
if (ldlm_is_destroyed(lock) || ldlm_is_failed(lock)) {
LDLM_DEBUG(lock, "client-side enqueue: destroyed");
result = -EIO;
+ } else if (!data) {
+ LDLM_DEBUG(lock, "client-side enqueue: granted");
} else {
+ /* Take into AT only CP RPC, not immediately granted locks */
delay = ktime_get_real_seconds() - lock->l_last_activity;
LDLM_DEBUG(lock, "client-side enqueue: granted after %lds",
delay);
/* Update our time estimate */
- at_measured(ldlm_lock_to_ns_at(lock),
- delay);
- result = 0;
+ at_measured(ldlm_lock_to_ns_at(lock), delay);
}
return result;
}
@@ -179,7 +191,7 @@ int ldlm_completion_ast_async(struct ldlm_lock *lock, __u64 flags, void *data)
if (!(flags & LDLM_FL_BLOCKED_MASK)) {
wake_up(&lock->l_waitq);
- return ldlm_completion_tail(lock);
+ return ldlm_completion_tail(lock, data);
}
LDLM_DEBUG(lock, "client-side enqueue returned a blocked lock, going forward");
@@ -238,13 +250,10 @@ noreproc:
if (obd)
imp = obd->u.cli.cl_import;
- /* Wait a long time for enqueue - server may have to callback a
- * lock from another client. Server will evict the other client if it
- * doesn't respond reasonably, and then give us the lock.
- */
- timeout = ldlm_get_enq_timeout(lock) * 2;
+ timeout = ldlm_cp_timeout(lock);
lwd.lwd_lock = lock;
+ lock->l_last_activity = ktime_get_real_seconds();
if (ldlm_is_no_timeout(lock)) {
LDLM_DEBUG(lock, "waiting indefinitely because of NO_TIMEOUT");
@@ -277,7 +286,7 @@ noreproc:
return rc;
}
- return ldlm_completion_tail(lock);
+ return ldlm_completion_tail(lock, data);
}
EXPORT_SYMBOL(ldlm_completion_ast);
@@ -715,6 +724,7 @@ int ldlm_cli_enqueue(struct obd_export *exp, struct ptlrpc_request **reqp,
lock->l_export = NULL;
lock->l_blocking_ast = einfo->ei_cb_bl;
lock->l_flags |= (*flags & (LDLM_FL_NO_LRU | LDLM_FL_EXCL));
+ lock->l_last_activity = ktime_get_real_seconds();
/* lock not sent to server yet */
--
1.7.1
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