> -----Original Message----- > From: ext Anton Vorontsov [mailto:cbouatmailru@xxxxxxxxx] > Sent: 08 June, 2012 13:35 ... > > Context switches, parsing, activity in userspace even memory situation is > not changed. > > Sure, there is some additional overhead. I'm just saying that it is not drastic. It > would be like 100 sprintfs + 100 sscanfs + 2 context switches? Well, it is > unfortunate... but come on, today's phones are running X11 and Java. :-) Vmstat generation is not so trivial. Meminfo has even higher overhead. I just checked generation time using idling device and open/read test: - vmstat min 30, avg 94 max 2746 uSeconds - meminfo min 30, average 65 max 15961 uSeconds In comparison /proc/version for the same conditions: min 30, average 41, max 1505 uSeconds > > In kernel space you can use sliding timer (increasing interval) + shinker. > > Well, w/ Minchan's idea, we can get shrinker notifications into the userland, > so the sliding timer thing would be still possible. Only as a post-schrinker actions. In case of memory stressing or close-to-stressing conditions shrinkers called very often, I saw up to 50 times per second. ��.n������g��� �a��� �&ޖ)���)��h���&������梷���� �Ǟ�m������)������^�����������v���O��zf������