Two new functions; svc_time_mark() remembers the current time
in a struct svc_time; svc_time_elapsed() calculates and returns
the time since a svc_time was marked.
Signed-off-by: Greg Banks <gnb@xxxxxxx>
---
include/linux/sunrpc/svc.h | 12 ++++++++++++
net/sunrpc/svc.c | 25 +++++++++++++++++++++++++
2 files changed, 37 insertions(+)
Index: bfields/include/linux/sunrpc/svc.h
===================================================================
--- bfields.orig/include/linux/sunrpc/svc.h
+++ bfields/include/linux/sunrpc/svc.h
@@ -18,6 +18,16 @@
#include <linux/sunrpc/svcauth.h>
#include <linux/wait.h>
#include <linux/mm.h>
+#include <linux/time.h>
+
+/*
+ * Structure used to implement a fast lockless elapsed time measure.
+ */
+struct svc_time
+{
+ struct timespec st_spec;
+};
+
/*
* This is the RPC server thread function prototype
@@ -419,6 +429,8 @@ int svc_register(const struct svc_se
void svc_wake_up(struct svc_serv *);
void svc_reserve(struct svc_rqst *rqstp, int space);
struct svc_pool * svc_pool_for_cpu(struct svc_serv *serv, int cpu);
+void svc_time_mark(struct svc_time *);
+int svc_time_elapsed(const struct svc_time *, struct timespec *);
char * svc_print_addr(struct svc_rqst *, char *, size_t);
#define RPC_MAX_ADDRBUFLEN (63U)
Index: bfields/net/sunrpc/svc.c
===================================================================
--- bfields.orig/net/sunrpc/svc.c
+++ bfields/net/sunrpc/svc.c
@@ -1232,3 +1232,28 @@ u32 svc_max_payload(const struct svc_rqs
return max;
}
EXPORT_SYMBOL_GPL(svc_max_payload);
+
+
+void
+svc_time_mark(struct svc_time *st)
+{
+ getnstimeofday(&st->st_spec);
+}
+EXPORT_SYMBOL(svc_time_mark);
+
+int
+svc_time_elapsed(const struct svc_time *mark, struct timespec *ts)
+{
+ struct svc_time now;
+
+ svc_time_mark(&now);
+
+ if (now.st_spec.tv_sec < mark->st_spec.tv_sec)
+ return -EINVAL; /* time going backwards */
+
+ *ts = timespec_sub(now.st_spec, mark->st_spec);
+
+ return 0;
+}
+EXPORT_SYMBOL(svc_time_elapsed);
+
--
Greg
--
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