Messages in this thread | | | Date | Wed, 4 Jan 2006 00:26:35 -0500 | From | Dave Jones <> | Subject | Re: [POLL] SLAB : Are the 32 and 192 bytes caches really usefull on x86_64 machines ? |
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On Thu, Dec 29, 2005 at 12:50:10PM +1100, Keith Owens wrote: > Dave Jones (on Wed, 28 Dec 2005 20:29:15 -0500) wrote: > > > > > Something like this: > > > > > > http://lwn.net/Articles/124374/ > > > >One thing that really sticks out like a sore thumb is soft_cursor() > >That thing gets called a *lot*, and every time it does a kmalloc/free > >pair that 99.9% of the time is going to be the same size alloc as > >it was the last time. This patch makes that alloc persistent > >(and does a realloc if the size changes). > >The only time it should change is if the font/resolution changes I think. > > Can soft_cursor() be called from multiple processes at the same time, > in particular with dual head systems? If so then a static variable is > not going to work.
I looked at this a little closer. If my understanding of the console/fb layers is correct, soft_cursor() is serialised by the console_sem in drivers/video/console/fbcon.c::fb_flashcursor()
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