hi, > YAMAMOTO Takashi <y...@mwd.biglobe.ne.jp> wrote: > >> as i told you a few times, ioflush is not a thread to free memory. >> pagedaemon is. > > Sure ioflush do not directly free memory, but vnodes' dirty page use > memory, don't they? If ioflush stops working, is pageadaemon able to > pageout that kind of memory?
pagedaemon flushes dirty pages by itself, yes. > >> please read ufs_bmaparray and grep "uvm.pagedaemon_lwp" >> in src/sys/kern/ to see what other filesystems do. i don't think this >> approach works for puffs because it's almost impossible to say in which >> cases an operation needs memory allocation to complete, though. > > It is indeed impossible, as we cannot know what the userland filesystem > will do. a possible solution would be local page recycling. ie. reserve some pages and put them onto a page queue dedicated for a given set of processes so that pages can be recycled in the set independently from the global queue. YAMAMOTO Takashi > > -- > Emmanuel Dreyfus > http://hcpnet.free.fr/pubz > m...@netbsd.org
