.\" Copyright (C) 1994, 1995, Daniel Quinlan <quinlan@yggdrasil.com>
.\" Copyright (C) 2002-2008, 2017, Michael Kerrisk <mtk.manpages@gmail.com>
.\" Copyright (C) 2023, Alejandro Colomar <alx@kernel.org>
.\"
.\" SPDX-License-Identifier: GPL-3.0-or-later
.\"
.TH proc_pid_timerslack_ns 5 (date) "Linux man-pages (unreleased)"
.SH NAME
/proc/pid/timerslack_ns \- timer slack in nanoseconds
.SH DESCRIPTION
.TP
.IR /proc/ pid /timerslack_ns " (since Linux 4.6)"
.\" commit da8b44d5a9f8bf26da637b7336508ca534d6b319
.\" commit 5de23d435e88996b1efe0e2cebe242074ce67c9e
This file exposes the process's "current" timer slack value,
expressed in nanoseconds.
The file is writable,
allowing the process's timer slack value to be changed.
Writing 0 to this file resets the "current" timer slack to the
"default" timer slack value.
For further details, see the discussion of
.B PR_SET_TIMERSLACK
in
.BR prctl (2).
.IP
Initially,
permission to access this file was governed by a ptrace access mode
.B PTRACE_MODE_ATTACH_FSCREDS
check (see
.BR ptrace (2)).
However, this was subsequently deemed too strict a requirement
(and had the side effect that requiring a process to have the
.B CAP_SYS_PTRACE
capability would also allow it to view and change any process's memory).
Therefore, since Linux 4.9,
.\" commit 7abbaf94049914f074306d960b0f968ffe52e59f
only the (weaker)
.B CAP_SYS_NICE
capability is required to access this file.
.SH SEE ALSO
.BR proc (5)