On Wed, 02 Feb 2011, Andrew Hastings wrote: > By default, libhugetlbfs will act on any program that it is loaded > with, either via LD_PRELOAD or by explicitly linking with -lhugetlbfs. > > There are situations in which it is desirable to restrict libhugetlbfs' > actions to specific programs. For example, some ISV applications are > wrapped in a series of scripts that invoke bash, python, and/or perl. > It is more convenient to set the environment variables related to > libhugetlbfs outside of the wrapper scripts, yet this has the unintended > and undesirable consequence of causing the script interpreters to use > and consume hugepages. Often there is no obvious benefit to causing the > script interpreters to use hugepages, and there is a clear disadvantage: > fewer hugepages are available to the actual application. > > To address this scenario, add a HUGETLB_RESTRICT_EXE environment variable. > If this variable is set, libhugetlbfs will restrict its actions to only > those programs named in HUGETLB_RESTRICT_EXE. (If not set, libhugetlbfs > will attempt to apply the requested actions to all programs.) > > For example, > > HUGETLB_RESTRICT_EXE="hpcc:long_hpcc" > > will restrict libhugetlbfs' actions to programs named /home/fred/hpcc > and /bench/long_hpcc but will not affect /usr/bin/hpcc_no. > > Based on a patch originally authored by Dean Luick <lu...@cray.com>. > > Signed-off-by: Andrew Hastings <a...@cray.com> on behalf of Cray Inc.
I have no problem with the way this patch handles your concern. Are you comfortable with me merging it as is? Eric
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