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+.\" Copyright, the authors of the Linux man-pages project
+.\"
+.\" SPDX-License-Identifier: Linux-man-pages-copyleft
+.\"
+.TH PR_FUTEX_HASH_SET_SLOTS 2const (date) "Linux man-pages (unreleased)"
+.SH NAME
+PR_FUTEX_HASH_SET_SLOTS
+\-
+set the size of the private hash
+.SH LIBRARY
+Standard C library
+.RI ( libc ,\~ \-lc )
+.SH SYNOPSIS
+.nf
+.BR "#include <linux/prctl.h>" "  /* Definition of " PR_* " constants */"
+.B #include <sys/prctl.h>
+.P
+.B int prctl(PR_FUTEX_HASH, PR_FUTEX_HASH_SET_SLOTS,
+.BI "          unsigned long " size ", unsigned long " flags ");
+.fi
+.SH DESCRIPTION
+Set the number of slots to use for the private hash.
+.TP
+.I size
+Specify the size of private hash to allocate.
+.RS
+.TP
+.I 0
+Use the global hash.
+This is the behaviour used before 6.17.
+.TP
+.I >0
+Specify the number of slots to allocate.
+The value must be power of two, and the lowest possible value is 2.
+The upper limit depends on the available memory in the system.
+Each slot requires 64 bytes of memory.
+Kernels compiled with
+.I CONFIG_PROVE_LOCKING
+will consume more than that.
+.RE
+.TP
+.I flags
+.RS
+The argument must be 0.
+.SH RETURN VALUE
+On success,
+0 is returned.
+On error, \-1 is returned, and
+.I errno
+is set to indicate the error.
+.SH ERRORS
+.TP
+.B EINVAL
+An argument is invalid.
+.TP
+.B ENOMEM
+Failed to allocate memory.
+.TP
+.B EBUSY
+The global hash is in use and can not be changed.
+.SH STANDARDS
+Linux.
+.SH HISTORY
+Linux 6.17.
+.SH SEE ALSO
+.BR prctl (2),
+.BR PR_FUTEX_HASH (2const)