[Bug debuginfod/31103] periodically malloc_trim()

[fche at redhat dot com]

https://sourceware.org/bugzilla/show_bug.cgi?id=31103

--- Comment #7 from Frank Ch. Eigler <fche at redhat dot com> ---
Right, the linux kernel does not share enough memory consumption data in
rusage, so you need to read /proc/self/statm or such and compare its snapshots.

For memory release, it's not so much the size of the database that matters, but
an amount of -activity- on the database before the release attempt.  It's the
memory allocation for temporary purposes (answering queries, adding data to the
database during scans) that we'd be hoping to release.

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