On Tue, May 08, 2012 at 01:13:05AM -0700, Anton Vorontsov wrote: > On Tue, May 08, 2012 at 03:16:59AM -0400, KOSAKI Motohiro wrote: > [...] > > >So, feel free to call me an idiot, but please expand your points a > > >little bit or give a link to the discussion you're referring to? > > > > I don't think you are idiot. But I hope you test your patch before submitting. > > That just don't work especially on x86. Because of, all x86 box have multiple zone > > and summarized statistics (i.e. global_page_state() thing) don't work and can't > > prevent oom nor swapping. > > Now I think I understand you: we don't take into account that e.g. DMA > zone is not usable by the normal allocations, and so if we're basing our > calculations on summarized stats, it is indeed possible to get an OOM > in such a case. Oops. Looking into it more, I think I was wrong here: kernel will surely use pages from the DMA zone when we have no pages in normal zones. So, I don't see how we can get OOM in that case. Hm. -- Anton Vorontsov Email: cbouatmailru@xxxxxxxxx -- 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>