On 03.03.2018 20:48, Peter Zijlstra wrote: > On Sat, Mar 03, 2018 at 04:43:16PM +0000, Song Liu wrote: >>> In any case, there's a ton of conflict against the patches here: >>> >>> https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/log/?h=perf/testing >>> >>> And with those the idea was to move to a virtual time based scheduler >>> (basically schedule those flexible events that have the biggest lag -- >>> that also solves 1). >> >> Thanks for these information. I will study this approach. Maybe that is >> our path to PMU sharing. > > So I'm really not convinced on that whole PMU sharing. > >> What's is the status of this work? Would it >> land in 4.17? > > These patches might make 4.17, they got held up because of the whole > meltdown/spectre crap and I need to get back to them. >
That work is long desired and would bring performance boost, specifically on server systems in per-process profiling mode, accompanied by good speedup on context switches. Undoubtedly meltdown/spectre related activity substituted it at some point but that improvements would still bring significant value and is still awaited. BR, Alexey
