Messages in this thread |  | | | Date | Tue, 8 Apr 1997 13:23:15 -0700 (PDT) | | From | Linus Torvalds <> | | Subject | Re: binary format loader cache? |
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On 8 Apr 1997, Michael O'Reilly wrote: > > Im suprised my patch to get_empty_filp() still isn't in the > kernel. Note that it isn't just the exec()'s the suffer from the > REALLY bad running time, but just about everthing is slowed fairly > dramtically. On machines doing lots of open()'s etc, patching > get_empty_filp() will give you an instant 5% improvement.
Actually, the reason I haven't applied this is that I want something that goes a lot further: when a process gets an empty file structure that structure should be totally removed from the "available file structures" list), and then added back on when f_count goes back to zero. That way get_empty_filp() would be O(1), because it could just get the first file pointer on the list and _know_ that it is directly usable.
However, this requires a bit more patches than just to get_empty_filp(), because unlike inodes we don't currently have a nice "put_filp()" function when we no longer use it - instead some code just decrements the counter and assumes the rest of the system will magically notice that it is no longer used.
Linus
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