[Bug malloc/19845] New: Add MADV_FREE support for new linux kernels.

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19845

            Bug ID: 19845
           Summary: Add MADV_FREE support for new linux kernels.
           Product: glibc
           Version: 2.24
            Status: NEW
          Severity: normal
          Priority: P2
         Component: malloc
          Assignee: unassigned at sourceware dot org
          Reporter: carlos at redhat dot com
  Target Milestone: ---

Malloc uses MADV_DONTNEED on Linux to mark pages as not needed. The semantics
of MADV_DONTNEED don't make it optimal for allocators to use.

Instead MADV_FREE has been added to address the issues faced by allocators.
MADV_FREE is a truly destructive operation as opposed to the more costly
MADV_DONTNEED.

The MADV_FREE call is officialy supported as of linux 4.5.

The malloc implementation should be adjusted to test for MADV_FREE availability
and use that in preference to MADV_DONTNEED.

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