Hi Pavel > > > As user pages are always in highmem, this should be easy to decide: > > > only send SIGDANGER when highmem is full. (Yes, there are > > > inodes/dentries/file descriptors in lowmem, but I doubt apps will > > > respond to SIGDANGER by closing files). > > > > Good point; for a system with at least (say) 2GB of memory, that > > definitely makes sense. For a system with less than 768 megs of > > memory (how quaint, but it wasn't that long ago this was a lot of > > memory :-), there wouldn't *be* any memory in highmem at all.... > > Ok, so it is 'send SIGDANGER when all zones are low', because user > allocations can go from all zones (unless you have something really > exotic, I'm not sure if that is true on huge NUMA machines & similar). thank you good point out. to be honest, the zone awareness of current mem_notify is premature. I think we need enhancement rss statistics to per zone rss. but not implemented yet ;-) and, unfortunately I have no highmem machine. the mem_notify is not so tested on highmem machine. if you help to test, I am very happy! Thanks. - To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
