Messages in this thread | | | Date | Sat, 14 Aug 2004 12:28:54 +0100 | From | James Courtier-Dutton <> | Subject | Re: [patch] Latency Tracer, voluntary-preempt-2.6.8-rc4-O6 |
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Ingo Molnar wrote: > i've uploaded the latest version of the voluntary-preempt patch: > > http://redhat.com/~mingo/voluntary-preempt/voluntary-preempt-2.6.8-rc4-O6 > <snip> > reports, suggestions welcome, > > Ingo
I used O7.
I have tested this for a day now, and I have noticed problems: 1) kernel syslog gets a record like this: > (default.hotplug/1470): 121 us critical section violates 100 us threshold. > => started at: <kmap_high+0x2b/0x2d0> > => ended at: <kmap_high+0x1a9/0x2d0> > [<c0105a23>] dump_stack+0x23/0x30 > [<c0140d14>] check_preempt_timing+0x184/0x1e0 > [<c0140e84>] sub_preempt_count+0x54/0x5d > [<c0152959>] kmap_high+0x1a9/0x2d0 > [<c017655a>] copy_strings+0xea/0x230 > [<c01766db>] copy_strings_kernel+0x3b/0x50 > [<c017840d>] do_execve+0x12d/0x1f0 > [<c0103284>] sys_execve+0x44/0x80 > [<c0104b95>] sysenter_past_esp+0x52/0x71 and the /proc/latency_trace gets: > preemption latency trace v1.0 > ----------------------------- > latency: 121 us, entries: 1032 (1032) > process: default.hotplug/1470, uid: 0 > nice: -10, policy: 0, rt_priority: 0 > =======> > 0.000ms (+0.000ms): page_address (kmap_high) > 0.000ms (+0.000ms): page_slot (page_address) > 0.000ms (+0.000ms): flush_all_zero_pkmaps (kmap_high) > 0.000ms (+0.000ms): set_page_address (flush_all_zero_pkmaps) > [...] > 0.118ms (+0.000ms): page_slot (set_page_address) > 0.118ms (+0.000ms): check_preempt_timing (sub_preempt_count)
Could the patch be adjusted to make the syslog and the /proc/latency_trace produce the same output?
2) I suspect that there is a problem with reiserfs, but when I detect a momentary hang in the system(mouse stops moving), no latency_trace appears.
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