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Top Forums UNIX for Advanced & Expert Users Memory fragmentation in a Linux settop box Post 302908381 by Corona688 on Monday 7th of July 2014 11:17:34 AM
Old 07-07-2014
I don't think that dropping caches will help much at all. They are already considered "Free", and the non-free stuff remains non-free, so how can dropping caches defragment anything?

What is your kernel?

Do you know if your application uses hugepages?
 

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CAPNG_CHANGE_ID(3)						   Libcap-ng API						CAPNG_CHANGE_ID(3)

NAME
capng_change_id - change the credentials retaining capabilities SYNOPSIS
#include <cap-ng.h> int capng_change_id(int uid, int gid, capng_flags_t flag); DESCRIPTION
This function will change uid and gid to the ones given while retaining the capabilities previously specified in capng_update. It is not necessary and perhaps better if capng_apply has not been called prior to this function so that all necessary privileges are still intact. The caller is required to have CAP_SETPCAP capability still active before calling this function. This function also takes a flag parameter that helps to tailor the exact actions performed by the function to secure the environment. The option may be or'ed together. The legal values are: CAPNG_NO_FLAG Simply change uid and retain specified capabilities and that's all. CAPNG_DROP_SUPP_GRP After changing id, remove and supplement groups that may come with the account. CAPNG_CLEAR_BOUNDING After changing the uid and gid, clear the bounding set regardless to the internal representation already setup. RETURN VALUE
This returns 0 on success and a negative number on failure. -1 means capng has not been initted properly, -2 means a failure requesting to keep capabilities across the uid change, -3 means that applying the intermediate capabilities failed, -4 means changing gid failed, -5 means dropping supplemental groups failed, -6 means changing the uid failed, -7 means dropping the ability to retain caps across a uid change failed, -8 means clearing the bounding set failed, -9 means dropping CAP_SETPCAP failed. Note: the only safe action to do upon failure of this function is to probably exit. This is because you are likely in a situation with par- tial permissions and not what you intended. SEE ALSO
capng_update(3), capng_apply(3), prctl(2), capabilities(7) AUTHOR
Steve Grubb Red Hat June 2009 CAPNG_CHANGE_ID(3)
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