From b5763ddcff7077dbdc8a7a4df2a07efc8a46534f Mon Sep 17 00:00:00 2001 From: Gabor Pali Date: Thu, 4 Jul 2013 21:03:14 +0000 Subject: [PATCH] - Add a Q2 entry on FreeBSD/arm superpages support Submitted by: Zbyszek Bodek --- .../news/status/report-2013-04-2013-06.xml | 85 ++++++++++++++++++- 1 file changed, 84 insertions(+), 1 deletion(-) diff --git a/en_US.ISO8859-1/htdocs/news/status/report-2013-04-2013-06.xml b/en_US.ISO8859-1/htdocs/news/status/report-2013-04-2013-06.xml index 9bfbe5ee01..775d5d3d43 100644 --- a/en_US.ISO8859-1/htdocs/news/status/report-2013-04-2013-06.xml +++ b/en_US.ISO8859-1/htdocs/news/status/report-2013-04-2013-06.xml @@ -18,7 +18,7 @@

Thanks to all the reporters for the excellent work! This report - contains 12 entries and we hope you enjoy reading it.

+ contains 13 entries and we hope you enjoy reading it.

The deadline for submissions covering between July and September 2013 @@ -615,4 +615,87 @@ Pawel Jakub Dawidek.

+ + + Superpages for ARMv7 + + + + + Zbigniew + Bodek + + zbb@semihalf.com + + + + + Grzegorz + Bernacki + + gjb@semihalf.com + + + + + Rafal + Jaworowski + + raj@semihalf.com + + + + + + + + + + +

The ARM architecture is more and more prevalent, not only in + the mobile and embedded space. Among the more interesting + industry trends emerging in the recent months, there has been + the concept of "ARM server". Some top-tier companies, e.g. + Dell and HP, have already started to develop such systems.

+ +

Key to success of &os; in these new areas is dealing with the + sophisticated features of the platform, for example adding + support for superpages.

+ +

The objective of this project is to enable &os;/arm to utilize + superpages which would allow efficient use of TLB translations + (by enlarging TLB coverage), leading to improved performance in + many applications and scalability. This is intended to work on + ARMv7-based processors, however compatibility with ARMv6 will be + preserved.

+ +

The following steps have been made since the last status + report:

+ +
    +
  • Implement pmap_copy() to support fork() + system calls.
    • +
  • Support for multiple page sizes.
    • +
  • Implement superpage creation, promotion, demotion, and + eviction mechanisms.
    • +
  • Implement PV entry management for superpages.
    • +
  • Partially integrate code to the head branch.
    • +
+ +

Next steps:

+ +
    +
  • Test and benchmark.
    • +
  • Complete integration into &os; head.
    • +
+ +

This project is jointly sponsored by The &os; Foundation and + Semihalf sp.j.

+ + + + Start utilizing superpages on ARMv6/v7. + Find bugs and debug. + +