[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-3.2-testing] x86: When Xen is notified that CPU frequency has changed, do not trust
# HG changeset patch # User Keir Fraser <keir.fraser@xxxxxxxxxx> # Date 1201516628 0 # Node ID 1b013d10c6d1e635de4fa5a499df2e0aff0dfd2d # Parent 3bf41a61a0347b42419a4047f2fcd40fb41df570 x86: When Xen is notified that CPU frequency has changed, do not trust the current TSC-extrapolated time when we re-sync. Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx> xen-unstable changeset: 16897:63275fd1596a2518aa5d8d0649cc90a3c74bfdea xen-unstable date: Sat Jan 26 11:29:29 2008 +0000 --- xen/arch/x86/time.c | 4 +++- 1 files changed, 3 insertions(+), 1 deletion(-) diff -r 3bf41a61a034 -r 1b013d10c6d1 xen/arch/x86/time.c --- a/xen/arch/x86/time.c Mon Jan 28 10:36:47 2008 +0000 +++ b/xen/arch/x86/time.c Mon Jan 28 10:37:08 2008 +0000 @@ -732,8 +732,10 @@ int cpu_frequency_change(u64 freq) local_irq_disable(); rdtscll(curr_tsc); t->local_tsc_stamp = curr_tsc; - t->stime_local_stamp = get_s_time(); t->stime_master_stamp = read_platform_stime(); + /* TSC-extrapolated time may be bogus after frequency change. */ + /*t->stime_local_stamp = get_s_time();*/ + t->stime_local_stamp = t->stime_master_stamp; set_time_scale(&t->tsc_scale, freq); local_irq_enable(); _______________________________________________ Xen-changelog mailing list Xen-changelog@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-changelog
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