Re: [PATCH] mremap: add MREMAP_NOHOLE flag --resend

On Wed, Mar 18, 2015 at 10:22:46PM -0700, Andrew Morton wrote:

On Wed, 18 Mar 2015 22:08:26 -0700 Shaohua Li [off-list ref] wrote:

quoted

quoted

Daniel also had microbenchmark testing results for glibc and jemalloc. 
Can you please do this?

I run Daniel's microbenchmark too, and not surprise the result is
similar:
glibc: 32.82
jemalloc: 70.35
jemalloc+mremap: 33.01
tcmalloc: 68.81

but tcmalloc doesn't support mremap currently, so I cant test it.

But Daniel's changelog implies strongly that tcmalloc would benefit
from his patch.  Was that inaccurate or is this a difference between
his patch and yours?

There is no big difference, except I fixed some issues. Daniel didn't
post data for tcmalloc, I suppose it's potential mremap can make
tcmalloc faster too, but Daniel can clarify.

Thanks,
Shaohua