On Mon, Jul 21, 2014 at 10:14:31AM +0800, Lan Tianyu wrote: > Date: Mon, 21 Jul 2014 10:14:31 +0800 > From: Lan Tianyu <tianyu.lan@xxxxxxxxx> > To: rjw@xxxxxxxxxxxxx, lenb@xxxxxxxxxx, linux-acpi@xxxxxxxxxxxxxxx, > linux-kernel@xxxxxxxxxxxxxxx, gong.chen@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] ACPI/NVS: Not save NVS region for new machines to > accelerate S3 > User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:14.0) Gecko/20120714 > Thunderbird/14.0 > > On 2014年07月18日 16:00, Chen, Gong wrote: > > On Fri, Jul 18, 2014 at 01:55:22PM +0800, Lan Tianyu wrote: > >> Date: Fri, 18 Jul 2014 13:55:22 +0800 > >> From: Lan Tianyu <tianyu.lan@xxxxxxxxx> > >> To: rjw@xxxxxxxxxxxxx, lenb@xxxxxxxxxx > >> Cc: Lan Tianyu <tianyu.lan@xxxxxxxxx>, linux-acpi@xxxxxxxxxxxxxxx, > >> linux-kernel@xxxxxxxxxxxxxxx > >> Subject: [PATCH] ACPI/NVS: Not save NVS region for new machines to > >> accelerate S3 > >> X-Mailer: git-send-email 1.7.9.5 > >> > >> NVS region is saved and restored unconditionally for machines without > >> nvs_nosave quirk during S3. Tested some new machines and the operation > >> is not necessary. Saving NVS region also affects S2RAM speed. The time of > >> NVS saving and restoring depends on the size of NVS region and it consumes > >> 7~10ms normally. > >> > >> This patch is to make machines produced from 2012 to now not saving NVS region > >> to accelerate S3. > >> > > The year 2012 is a mandatory value in the spec? > > > > No, spec indicates that this is only required for S4 and commit 2a6b697 > added this behavior because this can fix S3 bug on some machines. But > this isn't necessary for all machines and waster time for S3. So this > patch is to add time base quirk to change default behavior for new machines. > If so, I don't think a hard-coded valud in the kernel is a good idea. Why not providing a quirk via a command line parameter or module parameter.
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