Messages in this thread | | | Date | Wed, 04 Jan 2006 12:19:19 +0100 | From | Eric Dumazet <> | Subject | Re: [PATCH] Shrinks sizeof(files_struct) and better layout |
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Andi Kleen a écrit : > On Wednesday 04 January 2006 12:13, Eric Dumazet wrote: >> Andi Kleen a écrit : >>> Eric Dumazet <dada1@cosmosbay.com> 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' ?
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