From mboxrd@z Thu Jan 1 00:00:00 1970 From: Minchan Kim Subject: Re: [RFC v2 0/2] vmevent: A bit reworked pressure attribute + docs + man page Date: Thu, 25 Oct 2012 17:53:09 +0900 Message-ID: <20121025085309.GC15767@bbox> References: <20121022111928.GA12396@lizard> <20121025064009.GA15767@bbox> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: Sender: linux-man-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Pekka Enberg Cc: Anton Vorontsov , Mel Gorman , Leonid Moiseichuk , KOSAKI Motohiro , Bartlomiej Zolnierkiewicz , John Stultz , linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linaro-kernel-cunTk1MwBs8s++Sfvej+rw@public.gmane.org, patches-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, kernel-team-z5hGa2qSFaRBDgjK7y7TUQ@public.gmane.org, linux-man-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-man@vger.kernel.org Hi Pekka, On Thu, Oct 25, 2012 at 09:44:52AM +0300, Pekka Enberg wrote: > On Thu, Oct 25, 2012 at 9:40 AM, Minchan Kim wrote: > > Your description doesn't include why we need new vmevent_fd(2). > > Of course, it's very flexible and potential to add new VM knob easily but > > the thing we is about to use now is only VMEVENT_ATTR_PRESSURE. > > Is there any other use cases for swap or free? or potential user? > > Adding vmevent_fd without them is rather overkill. > > What ABI would you use instead? I thought /dev/some_knob like mem_notify and epoll is enough but please keep in mind that I'm not against vmevent_fd strongly. My point is that description should include explain about why other candidate is not good or why vmevent_fd is better. (But at least, I don't like vmevent timer polling still and I hope we use it as last resort once we can find another) > > On Thu, Oct 25, 2012 at 9:40 AM, Minchan Kim wrote: > > I don't object but we need rationale for adding new system call which should > > be maintained forever once we add it. > > Agreed. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo-Bw31MaZKKs0EbZ0PF+XxCw@public.gmane.org For more info on Linux MM, > see: http://www.linux-mm.org/ . > Don't email: email-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org -- Kind regards, Minchan Kim -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html