Re: [PATCH] Shrinks sizeof(files_struct) and better layout

On Wed, 4 Jan 2006, Eric Dumazet wrote:

Date: Wed, 04 Jan 2006 12:13:25 +0100
From: Eric Dumazet <[email protected]>
To: Andi Kleen <[email protected]>
Cc: [email protected]
Subject: Re: [PATCH] Shrinks sizeof(files_struct) and better layout

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.

is it enough of a win on machines with thousands of concurrent tasks that it would be a useful config option?

David Lang

--
There are two ways of constructing a software design. One way is to make it so simple that there are obviously no deficiencies. And the other way is to make it so complicated that there are no obvious deficiencies.
 -- C.A.R. Hoare

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