Messages in this thread | | | Date | Tue, 29 Jul 2008 03:18:38 -0700 | From | "Yinghai Lu" <> | Subject | Re: [PATCH] x86: printk_time to use tsc before cpu_clock is ready |
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On Tue, Jul 29, 2008 at 3:13 AM, Peter Zijlstra <peterz@infradead.org> wrote: > On Tue, 2008-07-29 at 03:09 -0700, Yinghai Lu wrote: >> so can get tsc value on printk >> >> need to apply after >> [PATCH] printk_time: prepare stub for using other than cpu_clock > > > You failed to mention why we want this... ;-) >
" otherwise will get [ 0.000000].... ..... [ 0.000000] TSC calibrated against PM_TIMER [ 0.000000] Detected 2493.378 MHz processor. [ 0.008000] spurious 8259A interrupt: IRQ7. [ 0.008000] Console: colour VGA+ 80x25 [ 0.008000] console handover: boot [uart0] -> real [ttyS0] [ 0.008000] Checking aperture... [ 0.008000] No AGP bridge found [ 0.008000] Node 0: aperture @ dc000000 size 64 MB [ 0.008000] Node 1: aperture @ dc000000 size 64 MB [ 0.008000] Node 2: aperture @ dc000000 size 64 MB [ 0.008000] Node 3: aperture @ dc000000 size 64 MB [ 0.008000] Node 4: aperture @ dc000000 size 64 MB [ 0.008000] Node 5: aperture @ dc000000 size 64 MB [ 0.008000] Node 6: aperture @ dc000000 size 64 MB [ 0.008000] Node 7: aperture @ dc000000 size 64 MB [ 0.008000] Memory: 264718324k/269090816k available (7532k kernel code, 3716316k reserved, 5099k data, 484k init) [ 0.008000] CPA: page pool initialized 1 of 1 pages preallocated [ 0.008000] SLUB: Genslabs=13, HWalign=64, Order=0-3, MinObjects=0, CPUs=32, Nodes=8 [ 0.008000] hpet clockevent registered [ 0.008000] Calibrating delay loop (skipped), value calculated using timer frequency.. 4986.72 BogoMIPS (lpj=9973456) [ 0.060003] Dentry cache hash table entries: 33554432 (order: 16, 268435456 bytes)
with this patch could get tsc to replace those [0,000000] and [0.0080000], so could debug possible delay on big system on early stage. "
YH
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