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ping: don't call monotonic_us twice per sending the ping

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function                                             old     new   delta
sendping6                                             80      85      +5
sendping4                                            106     111      +5
sendping_tail                                        209     204      -5
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 10/-5)               Total: 5 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2018-02-13 23:53:24 +01:00
parent 7189af847f
commit 256adb0f99
1 changed files with 11 additions and 10 deletions
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21
networking/ping.c
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@ -380,7 +380,8 @@ struct globals {
uint8_t pattern;
unsigned tmin, tmax; /* in us */
unsigned long long tsum; /* in us, sum of all times */
unsigned deadline_ms;
unsigned cur_us; /* low word only, we don't need more */
unsigned deadline_us;
unsigned timeout;
unsigned sizeof_rcv_packet;
char *rcv_packet; /* [datalen + MAXIPLEN + MAXICMPLEN] */
@ -455,7 +456,7 @@ static void print_stats_and_exit(int junk UNUSED_PARAM)
tmax / 1000, tmax % 1000);
}
/* if condition is true, exit with 1 -- 'failure' */
exit(nrecv == 0 || (G.deadline_ms && nrecv < pingcount));
exit(nrecv == 0 || (G.deadline_us && nrecv < pingcount));
}
static void sendping_tail(void (*sp)(int), int size_pkt)
@ -467,8 +468,8 @@ static void sendping_tail(void (*sp)(int), int size_pkt)
size_pkt += datalen;
if (G.deadline_ms) {
unsigned n = ((unsigned)monotonic_ms()) - G.deadline_ms;
if (G.deadline_us) {
unsigned n = G.cur_us - G.deadline_us;
if ((int)n >= 0)
print_stats_and_exit(0);
}
@ -517,7 +518,7 @@ static void sendping4(int junk UNUSED_PARAM)
*/
/*if (datalen >= 4)*/
/* No hton: we'll read it back on the same machine */
*(uint32_t*)&pkt->icmp_dun = monotonic_us();
*(uint32_t*)&pkt->icmp_dun = G.cur_us = monotonic_us();
pkt->icmp_cksum = inet_cksum((uint16_t *) pkt, datalen + ICMP_MINLEN);
@ -536,7 +537,7 @@ static void sendping6(int junk UNUSED_PARAM)
pkt->icmp6_id = myid;
/*if (datalen >= 4)*/
*(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = monotonic_us();
*(bb__aliased_uint32_t*)(&pkt->icmp6_data8[4]) = G.cur_us = monotonic_us();
//TODO? pkt->icmp_cksum = inet_cksum(...);
@ -891,7 +892,7 @@ static int common_ping_main(int opt, char **argv)
OPT_STRING
/* exactly one arg; -v and -q don't mix */
"\0" "=1:q--v:v--q",
&pingcount, &str_s, &opt_ttl, &G.deadline_ms, &timeout, &str_I, &str_p
&pingcount, &str_s, &opt_ttl, &G.deadline_us, &timeout, &str_I, &str_p
);
if (opt & OPT_s)
datalen = xatou16(str_s); // -s
@ -905,9 +906,9 @@ static int common_ping_main(int opt, char **argv)
}
if (opt & OPT_p)
G.pattern = xstrtou_range(str_p, 16, 0, 255);
if (G.deadline_ms) {
unsigned d = G.deadline_ms < INT_MAX/1000 ? G.deadline_ms : INT_MAX/1000;
G.deadline_ms = 1 | ((d * 1000) + monotonic_ms());
if (G.deadline_us) {
unsigned d = G.deadline_us < INT_MAX/1000000 ? G.deadline_us : INT_MAX/1000000;
G.deadline_us = 1 | ((d * 1000000) + monotonic_us());
}
myid = (uint16_t) getpid();