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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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PR_SET_THP_DISABLE(2const) PR_SET_THP_DISABLE(2const)
PR_SET_THP_DISABLE - set the state of the "THP disable" flags for
the calling thread
Standard C library (libc, -lc)
#include <linux/prctl.h> /* Definition of PR_* constants */
#include <sys/prctl.h>
int prctl(PR_SET_THP_DISABLE, long thp_disable, unsigned long flags,
0L, 0L);
Set the state of the "THP disable" flags for the calling thread.
If thp_disable has a nonzero value, the THP disable flag is set
according to the value of flags, otherwise it is cleared.
This prctl(2) provides a method for disabling transparent huge
pages for jobs where the code cannot be modified, and using a
malloc(3) hook with madvise(2) is not an option (i.e., statically
allocated data). The setting of the "THP disable" flags is
inherited by a child created via fork(2) and is preserved across
execve(2).
The behavior depends on the value of flags:
0 The prctl(2) call will disable THPs completely for the
process, irrespective of global THP controls or
MADV_COLLAPSE.
PR_THP_DISABLE_EXCEPT_ADVISED
The prctl(2) call will disable THPs for the process except
when the usage of THPs is advised. Consequently, THPs will
only be used when:
• Global THP controls are set to "always" or "madvise" and
madvise(..., MADV_HUGEPAGE) or
madvise(..., MADV_COLLAPSE) is used.
• Global THP controls are set to "never" and
madvise(..., MADV_COLLAPSE) is used. This is the same
behavior as if THPs would not be disabled on a process
level.
On success, 0 is returned. On error, -1 is returned, and errno is
set to indicate the error.
Linux.
Linux 3.15.
prctl(2), PR_GET_THP_DISABLE(2const)
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Linux man-pages 6.18 2026-02-08 PR_SET_THP_DISABLE(2const)
Pages that refer to this page: prctl(2), PR_GET_THP_DISABLE(2const)
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HTML rendering created 2026-05-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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