Re: [Xen-devel] [PATCH] use tlsf for xmalloc engine

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Wed, Oct 15, 2008 at 02:03:34PM -0700, Dan Magenheimer wrote:
> This patch replaces the Xen xmalloc engine with tlsf, an allocation
> engine that is both more space efficient and time-bounded, especially
> for allocation sizes between PAGE_SIZE/2 and PAGE_SIZE.
> 
> The file xmalloc.c is deprecated but not yet deleted.  A simple
> switch of a comment line in common/Makefile will change back
> to the legacy xmalloc/xfree if needed for testing.
> 
> Code adapted from Nitin Gupta's tlsf-kmod, rev 229, found here:
> http://code.google.com/p/compcache/source/browse/trunk/sub-projects/allocators/tlsf-kmod
> with description and performance details here:
> http://code.google.com/p/compcache/wiki/TLSFAllocator
> (new Xen code uses 4K=PAGE_SIZE for the region size)
> 
> For detailed info on tlsf, see:
> http://rtportal.upv.es/rtmalloc/
> 
> (NOTE to Isaku-san: There may be some subtle alignment or PAGE_SIZE
> issues to get tlsf to work on ia64.  I have not tried it.
> If problems, use an ifdef in common/Makefile to change to
> the legacy xmalloc on ia64.)

I did a very light test. It booted and pv domain and hvm domain can 
boot.
Looking at xmalloc use in ia64 specific code, it seems ok
to allow cache line size alignment at most.

Thank you for reminding me.
-- 
yamahata

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