On 07/14/2017 03:45 PM, Brian C. Anderson wrote: > Hi, > > Hoping I have the right email list for this topic. fsdevel makes sense, but linux-kernel would probably provide more eyes on it. [snip] > A few questions: > 1) Do you see any problems with the approach I'm taking? > 2) How concerning is backwards compatibility; especially regarding > user code that may not handle being notified of EPOLLIN when the file > isn't actually readable anymore. > 3) A ~30% improvement is larger than I would have expected. Any clues > what might be going on? I find it hard to believe improved cache > locality explains it all. > 4) Are there existing performance tests I can run the patch against? You could try some of Davide Libenzi's epoll test programs, although they need some updating before they are usable. See: http://xmailserver.org/epoll_test.c {internals test} http://xmailserver.org/totalmess.c {multithread test} and http://marc.info/?l=linux-ia64&m=108458304114939&w=2 {performance} -- ~Randy
