Messages in this thread | | | From | KOSAKI Motohiro <> | Subject | Re: [RFC v1][PATCH]page_fault retry with NOPAGE_RETRY | Date | Thu, 27 Nov 2008 20:08:29 +0900 (JST) |
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> Furthermore, /proc code usually isn't written with performance in mind, > so its usually simple and robust code. Adding it to a 'hot'-path like > you're doing doesn't seem advisable. > > Also, releasing and re-acquiring mmap_sem can significantly add to the > cacheline bouncing that thing already has.
Interesting.
I tryed to demonstration /proc slowness.
1. make many process $ nice ./hackbench 120 process 10000
2. read /proc $ time ps -ef
0.16s user 0.57s system 1% cpu 46.859 total
HAHAHA! That is really slow over my expected.
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