Re: [PATCH RT 00/02] SLOB optimizations

[Eric Dumazet]

Ingo Molnar a écrit :
> * Steven Rostedt <rostedt@xxxxxxxxxxx> 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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