PR_SET_THP_DISABLE(2const)                          PR_SET_THP_DISABLE(2const)

NAME
       PR_SET_THP_DISABLE - set the state of the "THP disable" flags for the
       calling thread

LIBRARY
       Standard C library (libc, -lc)

SYNOPSIS
       #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);

DESCRIPTION
       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:

              o  Global THP controls are set to "always" or "madvise" and
                 madvise(..., MADV_HUGEPAGE) or madvise(..., MADV_COLLAPSE) is
                 used.

              o  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.

RETURN VALUE
       On success, 0 is returned.  On error, -1 is returned, and errno is set
       to indicate the error.

STANDARDS
       Linux.

HISTORY
       Linux 3.15.

SEE ALSO
       prctl(2), PR_GET_THP_DISABLE(2const)

Linux man-pages 6.19              2026-02-08        PR_SET_THP_DISABLE(2const)