On 2014年10月09日 04:54, Peter Zijlstra wrote: > On Thu, Sep 25, 2014 at 04:32:02PM +0800, Lan Tianyu wrote: >> This patchset is to parallel enabling nonboot cpus with resuming devices >> during system resume in order to accelerate S2RAM. From test result on >> a 8 logical core Haswell machine, system resume time reduces from 347ms >> to 217ms with this patchset. >> >> In the current world, all nonboot cpus are enabled serially during system >> resume. System resume sequence is that boot cpu enables nonboot cpu one by >> one and then resume devices. Before resuming devices, there are few tasks >> assigned to nonboot cpus after they are brought up. This wastes cpu usage. >> >> This patchset is to allow boot cpu to go forward to resume devices after >> bringing up one nonboot cpu and starting a thread. The thread will be in >> charge of bringing up other frozen cpus. The thread will be scheduled to >> the first online cpu to run . This makes enabling cpu2~x parallel with >> resuming devices. > > So I feel we should really clean up hotplug before doing anything like > this. Its a trainwreck and just piling more and more hacks ontop isn't > going to help any. >
Hi Peter: Sorry, I don't know the gap of hotplug clearly. Could you elaborate it? -- Best regards Tianyu Lan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/