Andi Kleen a écrit :
On Wednesday 04 January 2006 12:13, Eric Dumazet wrote:
Andi Kleen a écrit :
Eric Dumazet <[email protected]> writes:
1) Reduces the size of (struct fdtable) to exactly 64 bytes on 32bits
platforms, lowering kmalloc() allocated space by 50%.
It should be probably a kmem_cache_alloc() instead of a kmalloc
in the first place anyways. This would reduce fragmentation.
Well in theory yes, if you really expect thousand of tasks running...
But for most machines, number of concurrent tasks is < 200, and using a
special cache for this is not a win.
It is because it avoids fragmentation because objects with similar livetimes
are clustered together. In general caches are a win
if the data is nearly a page or more.
I dont undertand your last sentence. Do you mean 'if the object size is near
PAGE_SIZE' ?
Eric
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