linux-kernel - Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM build-time optional

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Message-ID: <1549900.RSMcUBBPG7@vostro.rjw.lan>
Date:	Sat, 01 Aug 2015 01:57:44 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Len Brown <lenb@...nel.org>
Cc:	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Len Brown <len.brown@...el.com>
Subject: Re: [PATCH 1/1] suspend: make sync() on suspend-to-RAM build-time optional

On Friday, July 31, 2015 12:46:17 PM Len Brown wrote:
> From: Len Brown <len.brown@...el.com>
> 
> The Linux kernel suspend path has traditionally invoked sys_sync()
> before freezing user threads.
> 
> But sys_sync() can be expensive, and some user-space OS's do not want
> the kernel to pay the cost of sys_sync() on every suspend -- preferring
> invoke sync() from user-space if/when they want it.
> 
> So make sys_sync on suspend build-time optional.
> 
> The default is unchanged.
> 
> Signed-off-by: Len Brown <len.brown@...el.com>

OK, I'm replacing your previous sync patch with this one (modulo some minor
changes in the help text).

Thanks,
Rafael

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