Messages in this thread |  | | | Date | Wed, 21 Dec 2005 08:20:05 +0100 | | From | Eric Dumazet <> | | Subject | Re: [PATCH RT 00/02] SLOB optimizations |
Ingo Molnar a écrit : > * Steven Rostedt <rostedt@goodmis.org> wrote: > > >>[...] Today's slab system is starting to become like the IDE where >>nobody, but a select few sado-masochis, dare to venture in. (I've CC'd >>them ;) [...] > > > while it could possibly be cleaned up a bit, it's one of the > best-optimized subsystems Linux has. Most of the "unnecessary > complexity" in SLAB is related to a performance or a debugging feature. > Many times i have looked at the SLAB code in a disassembler, right next > to profile output from some hot workload, and have concluded: 'I couldnt > do this any better even with hand-coded assembly'.
Well, I miss a version of kmem_cache_alloc()/kmem_cache_free() that wont play with IRQ masking.
The local_irq_save()/local_irq_restore() pair is quite expensive and could be avoided for several caches that are exclusively used in process context.
(Not speaking of general caches of course, but caches like dentry_cache, filp, ...)
Eric
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