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timeval: Use monotonic time where appropriate.

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Most of the timekeeping needs of OVS are simply to measure intervals,
which means that it is sensitive to changes in the clock.  This commit
replaces the existing clocks with monotonic timers.  An additional set
of wall clock timers are added and used in locations that need absolute
time.

Bug #1858
This commit is contained in:
Jesse Gross
2010-06-08 17:18:48 -07:00
parent c6f196a050
commit c73814a3e6
13 changed files with 161 additions and 47 deletions
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8
lib/dpif-netdev.c
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@@ -99,7 +99,7 @@ struct dp_netdev_flow {
flow_t key;
/* Statistics. */
struct timeval used; /* Last used time, in milliseconds. */
struct timespec used; /* Last used time. */
long long int packet_count; /* Number of packets matched. */
long long int byte_count; /* Number of bytes matched. */
uint8_t ip_tos; /* IP TOS value. */
@@ -680,7 +680,7 @@ answer_flow_query(struct dp_netdev_flow *flow, uint32_t query_flags,
odp_flow->stats.n_packets = flow->packet_count;
odp_flow->stats.n_bytes = flow->byte_count;
odp_flow->stats.used_sec = flow->used.tv_sec;
odp_flow->stats.used_nsec = flow->used.tv_usec * 1000;
odp_flow->stats.used_nsec = flow->used.tv_nsec;
odp_flow->stats.tcp_flags = TCP_FLAGS(flow->tcp_ctl);
odp_flow->stats.ip_tos = flow->ip_tos;
odp_flow->stats.error = 0;
@@ -826,7 +826,7 @@ static void
clear_stats(struct dp_netdev_flow *flow)
{
flow->used.tv_sec = 0;
flow->used.tv_usec = 0;
flow->used.tv_nsec = 0;
flow->packet_count = 0;
flow->byte_count = 0;
flow->ip_tos = 0;
@@ -1003,7 +1003,7 @@ static void
dp_netdev_flow_used(struct dp_netdev_flow *flow, const flow_t *key,
const struct ofpbuf *packet)
{
time_timeval(&flow->used);
time_timespec(&flow->used);
flow->packet_count++;
flow->byte_count += packet->size;
if (key->dl_type == htons(ETH_TYPE_IP)) {