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Posted to dev@apr.apache.org by GitBox <gi...@apache.org> on 2022/01/27 13:54:21 UTC
[GitHub] [apr] monkburger opened a new pull request #32: Use MAP_POPULATE if available
monkburger opened a new pull request #32:
URL: https://github.com/apache/apr/pull/32
mmap's MAP_POPULATE will help to avoid expensive page faults by filling the page table with entries (read ahead on a file) MAP_POPULATE has been present on Linux since kernel 2.5.46 (20 years ago).
XXX: Would it be better to scope configure.in to check to see if MAP_POPULATE returns EINVAL?
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[GitHub] [apr] monkburger closed pull request #32: Use MAP_POPULATE if available
Posted by GitBox <gi...@apache.org>.
monkburger closed pull request #32:
URL: https://github.com/apache/apr/pull/32
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[GitHub] [apr] ylavic commented on pull request #32: Use MAP_POPULATE if available
Posted by GitBox <gi...@apache.org>.
ylavic commented on pull request #32:
URL: https://github.com/apache/apr/pull/32#issuecomment-1023334211
I'd suggest that you add a new `APR_MMAP_POPULATE` flag (e.g. `#define APR_MMAP_POPULATE 4` for a bitmask with the existing `APR_MMAP_READ` and `APR_MMAP_WRITE`) so that the user has the choice.
Some may not want to pay the price of filling up the page table entries at mmap() time if they don't necessarily access the memory entirely later.
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