Messages in this thread | | | Subject | Re: [PATCH] writeback: remove unnecessary wait in throttle_vm_writeout() | From | (Frank Ch. Eigler) | Date | Fri, 28 Sep 2007 15:50:14 -0400 |
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Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> writes:
>> [...] >> > I totally agree with Ingo here. Having a basic instrumentation that is >> > enabled by default will help to identify code paths causing unexpected >> > delays in the kernel. [...] > >> It is. See: CONFIG_VM_EVENT_COUNTERS and all the other vm specific >> crap littered in /proc/ (buddyinfo, zoneinfo, meminfo, etc). [...]
> Isn't the actual instrumentation present in the VM subsystem > consisting mostly of event counters ? This kind of profiling > provides limited help in following specific delays in the > kernel. [...]
These existing VM events/counters could be a good target for a second worked-out example (after blktrace) of reimplementation using generic markers.
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