From 8da3ba86dcb25f842958179693b5d802d91ae681 Mon Sep 17 00:00:00 2001 From: phk Date: Mon, 29 Nov 1999 11:29:04 +0000 Subject: Add a bit of sanity checking and problem avoidance in case the timecounter hardware is bogus. This will produce a new warning "microuptime() went backwards" and try to not screw up the process resource accounting. --- sys/kern/kern_resource.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) (limited to 'sys/kern/kern_resource.c') diff --git a/sys/kern/kern_resource.c b/sys/kern/kern_resource.c index fde934e..495175e 100644 --- a/sys/kern/kern_resource.c +++ b/sys/kern/kern_resource.c @@ -49,6 +49,7 @@ #include #include #include +#include #include #include @@ -519,8 +520,13 @@ calcru(p, up, sp, ip) * quantum, which is much greater than the sampling error. */ microuptime(&tv); - tu += (tv.tv_usec - switchtime.tv_usec) + - (tv.tv_sec - switchtime.tv_sec) * (int64_t)1000000; + if (timevalcmp(&tv, &switchtime, <)) + printf("microuptime() went backwards (%ld.%06ld -> %ld,%06ld)\n", + switchtime.tv_sec, switchtime.tv_usec, + tv.tv_sec, tv.tv_usec); + else + tu += (tv.tv_usec - switchtime.tv_usec) + + (tv.tv_sec - switchtime.tv_sec) * (int64_t)1000000; } ptu = p->p_stats->p_uu + p->p_stats->p_su + p->p_stats->p_iu; if (tu < ptu || (int64_t)tu < 0) { -- cgit v1.1