[PATCH v2 1/2] treewide: remove unused address argument from pte_alloc functions

This series speeds up mremap(2) syscall by copying page tables at the PMD level even for non-THP systems. There is concern that the extra 'address' argument that mremap passes to pte_alloc may do something subtle architecture related in the future, that makes the scheme not work. Also we find that

[PATCH v2 2/2] mm: speed up mremap by 500x on large regions

Android needs to mremap large regions of memory during memory management related operations. The mremap system call can be really slow if THP is not enabled. The bottleneck is move_page_tables, which is copying each pte at a time, and can be really slow across a large map. Turning on THP may not be

Re: [PATCH] ARCv2: build: use mcpu=hs38 iso generic mcpu=archs

Hi Alexey, On Thu, Oct 11, 2018 at 09:22:50PM +, Alexey Brodkin wrote: > Hu Guenter, > > > -Original Message- > > From: linux-snps-arc [mailto:linux-snps-arc-boun...@lists.infradead.org] On > > Behalf Of Guenter Roeck > > Sent: Wednesday, September 12, 2018 7:58 PM > > To: Vineet Gup

RE: [PATCH] ARCv2: build: use mcpu=hs38 iso generic mcpu=archs

Hu Guenter, > -Original Message- > From: linux-snps-arc [mailto:linux-snps-arc-boun...@lists.infradead.org] On > Behalf Of Guenter Roeck > Sent: Wednesday, September 12, 2018 7:58 PM > To: Vineet Gupta > Cc: linux-snps-arc@lists.infradead.org; linux-ker...@vger.kernel.org > Subject: Re:

Re: [PATCH] ARCv2: build: use mcpu=hs38 iso generic mcpu=archs

Hi, On Fri, Sep 07, 2018 at 03:13:10PM -0700, Vineet Gupta wrote: > helps gcc with better instruction selections such as 64-bit multiply MPYD > > before > -- > 82c34b58 : > 82c34b58: ld r2,[0x83068d00] > 82c34b60: add_s r2,r2,0x7530 > 82c34b66: mov_s r0,0x989680 > 82c34b6