Messages in this thread | | | Date | Wed, 27 Sep 2017 15:45:06 +0100 | From | Russell King - ARM Linux <> | Subject | Re: [PATCH v6 1/4] sched/clock: interface to allow timestamps early in boot |
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On Wed, Aug 30, 2017 at 02:03:22PM -0400, Pavel Tatashin wrote: > In Linux printk() can output timestamps next to every line. This is very > useful for tracking regressions, and finding places that can be optimized. > However, the timestamps are available only later in boot. On smaller > machines it is insignificant amount of time, but on larger it can be many > seconds or even minutes into the boot process.
The sched_clock work I did for ARM could be setup really early at boot, from setup_arch(). I tried to encourage platforms to do that, but all my encouragement fell on deaf ears - most people setup the sched_clock source along side the time initialisation on ARM.
I don't think we need yet another "early" mechanism to solve this problem, we just need people to use the existing mechanism to register their sched_clock implementation earlier.
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