On 05/02/2012 03:57 PM, Pekka Enberg wrote: > On Wed, May 2, 2012 at 8:04 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote: >> I think hardest problem in low mem notification is how to define _lowmem situation_. >> We all guys (server, desktop and embedded) should reach a conclusion on define lowmem situation >> before progressing further implementation because each part can require different limits. >> Hopefully, I want it. >> >> What is the best situation we can call it as "low memory"? > > Looking at real-world scenarios, it seems to be totally dependent on > userspace policy. That's why I insist on defining low memory state in user space, not kernel. > > On Wed, May 2, 2012 at 8:04 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote: >> As a matter of fact, if we can define it well, I think even we don't neead vmevent ABI. >> In my opinion, it's not easy to generalize each use-cases so we can pass it to user space and >> just export low attributes of vmstat in kernel by vmevent. >> Userspace program can determine low mem situation well on his environment with other vmstats >> when notification happens. Of course, it has a drawback that userspace couples kernel's vmstat >> but at least I think that's why we need vmevent for triggering event when we start watching carefully. > > Please keep in mind that VM events is not only about "low memory" > notification. The ABI might be useful for other kinds of VM events as > well. Fully agreed but we should prove why such event is useful in real scenario before adding more features. > > -- > To unsubscribe, send a message with 'unsubscribe linux-mm' in > the body to majordomo@xxxxxxxxx. For more info on Linux MM, > see: http://www.linux-mm.org/ . > Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a> > -- Kind regards, Minchan Kim -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>