Messages in this thread |  | | From | (Daniel Barlow) | Subject | Re: Please don't beat me up (was Re: Bugs and wishes in memory management area) | Date | Sun, 1 Dec 1996 15:20:37 GMT |
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In article <Pine.LNX.3.91.961129202137.142A-100000@nextd.demon.co.uk>, Mark Hemment <markhe@nextd.demon.co.uk> wrote: >behaviour. If you know the usage patterns, it is possible to design >efficient allocators for specific applications. Difficult to do in a >kernel.
Am I missing something here? A couple of printk()s in kmalloc and kfree() will show you the usage patterns quite clearly, and a lot of them _are_ regular.
I haven't messed with this since 1.3.70 or so, but at that time the n most common request sizes were 56, 84,516, 988, 16 and 1060. 56 bytes accounted for around 80% of the requests. Try it!
By the way, 56 is (or was, anyway) sizeof (vm_area_struct). These figures were produced on a standalone box; obviously networking makes a difference
-dan
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