riscv now uses this sysctl so document its usage for this architecture. Signed-off-by: Alexandre Ghiti <alexghiti@xxxxxxxxxxxx> --- Documentation/admin-guide/sysctl/kernel.rst | 24 +++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 4b7bfea28cd7..93cd518ca94b 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -941,16 +941,32 @@ enabled, otherwise writing to this file will return ``-EBUSY``. The default value is 8. -perf_user_access (arm64 only) -================================= +perf_user_access (arm64 and riscv only) +======================================= + +Controls user space access for reading perf event counters. -Controls user space access for reading perf event counters. When set to 1, -user space can read performance monitor counter registers directly. +arm64 +===== The default value is 0 (access disabled). +When set to 1, user space can read performance monitor counter registers +directly. See Documentation/arm64/perf.rst for more information. +riscv +===== + +When set to 0, user access is disabled. + +When set to 1, user space can read performance monitor counter registers +directly only through perf, any direct access without perf intervention will +trigger an illegal instruction. + +The default value is 2, which enables legacy mode (user space has direct +access to cycle, time and insret CSRs only). Note that this legacy value +is deprecated and will be removed once all userspace applications are fixed. pid_max ======= -- 2.37.2
