Pre-populating anonymous pages

By: Travis Downs (, June 6, 2019 7:11 am
Room: Moderated Discussions
Jeff S. ( on June 5, 2019 8:03 pm wrote:

> Just MAP_FIXED|MAP_POPULATE over page rages not mincore()? You're at least safe from mlock() ulimits then.

Yeah, this crossed my mind, but it seems a bit risky?

This will replace the existing mapping. If the new mmap has the same characteristics as the old one, I guess that is harmless, but I can't really be sure of how the pages were mapped in the first place and I feel like it could break when the allocator changes. Maybe the pages weren't even allocated with mmap in the first place, but rather [s]brk(2) or something like that (IIRC most allocators still try to use brk for at least some allocations).
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TopicPosted ByDate
Pre-populating anonymous pagesTravis Downs2019/06/05 04:48 PM
  Pre-populating anonymous pagesJeff S.2019/06/05 08:03 PM
    Pre-populating anonymous pagesTravis Downs2019/06/06 07:11 AM
      Pre-populating anonymous pagesJeff S.2019/06/06 08:40 AM
        Pre-populating anonymous pagesTravis Downs2019/06/06 08:59 AM
          Pre-populating anonymous pagesJeff S.2019/06/06 09:19 AM
  Pre-populating anonymous pagesFoo_2019/06/06 12:30 AM
    Pre-populating anonymous pagesTravis Downs2019/06/06 06:59 AM
      Pre-populating anonymous pagesFoo_2019/06/06 07:56 AM
        Pre-populating anonymous pagesTravis Downs2019/06/06 09:02 AM
  Pre-populating anonymous pagesLinus Torvalds2019/06/06 11:01 AM
    Pre-populating anonymous pagesTravis Downs2019/06/07 02:16 PM
      Pre-populating anonymous pagesBrendan2019/06/08 02:55 AM
        Pre-populating anonymous pagesTravis Downs2019/06/08 08:18 AM
        Pre-populating anonymous pagesLinus Torvalds2019/06/08 11:43 AM
          Pre-populating anonymous pagesBrendan2019/06/09 03:29 AM
            Pre-populating anonymous pagesLinus Torvalds2019/06/10 11:20 AM
          Pre-populating anonymous pagesTravis Downs2019/06/17 09:18 AM
            Pre-populating anonymous pagesLinus Torvalds2019/06/18 04:28 PM
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