[openwrt/openwrt] kernel: enable pressure interface

[LEDE Commits]

ynezz pushed a commit to openwrt/openwrt.git, branch openwrt-24.10:
https://git.openwrt.org/9e73f794adc8fae59c8ff45aed2d99e4b43cc2d5

commit 9e73f794adc8fae59c8ff45aed2d99e4b43cc2d5
Author: John Audia <therealgraysky at proton.me>
AuthorDate: Sun Oct 29 04:32:21 2023 -0400

    kernel: enable pressure interface
    
    PSI provides a canonical way to see resource pressure increases as
    they develop, with pressure metrics for three major resources:
    memory, CPU, and IO. PSI stats are like barometers that provide
    fair warning of impending resource shortages, enabling users to
    take more proactive, granular, and nuanced steps when resources
    start becoming scarce.
    
    References:
    * https://www.kernel.org/doc/html/latest/accounting/psi.html
    * https://lwn.net/Articles/759781/
    
    Build system: x86/64
    Build-tested: x86/64/AMD Cezanne, flogic/glinet_gl-mt6000
    Run-tested: x86/64/AMD Cezanne, flogic/glinet_gl-mt6000
    
    Signed-off-by: John Audia <therealgraysky at proton.me>
    Link: https://github.com/openwrt/openwrt/pull/13819
    Signed-off-by: Hauke Mehrtens <hauke at hauke-m.de>
    (cherry picked from commit eed39d45c2ff901b5327c7ab63c9131166e3140e)
    Link: https://github.com/openwrt/openwrt/pull/17097
    Signed-off-by: Petr Štetiar <ynezz at true.cz>
---
 config/Config-kernel.in         | 19 +++++++++++++++++++
 target/linux/generic/config-6.6 |  1 +
 2 files changed, 20 insertions(+)

diff --git a/config/Config-kernel.in b/config/Config-kernel.in
index 0fa039db40..91678cf2a6 100644
--- a/config/Config-kernel.in
+++ b/config/Config-kernel.in
@@ -333,6 +333,25 @@ if KERNEL_TASKSTATS
 
 endif
 
+config KERNEL_PSI
+	bool "Compile the kernel with pressure stall information tracking"
+	help
+	  Collect metrics that indicate how overcommitted the CPU, memory,
+	  and IO capacity are in the system.
+
+	  If you say Y here, the kernel will create /proc/pressure/ with the
+	  pressure statistics files cpu, memory, and io. These will indicate
+	  the share of walltime in which some or all tasks in the system are
+	  delayed due to contention of the respective resource.
+
+	  In kernels with cgroup support, cgroups (cgroup2 only) will
+	  have cpu.pressure, memory.pressure, and io.pressure files,
+	  which aggregate pressure stalls for the grouped tasks only.
+
+	  For more details see Documentation/accounting/psi.rst.
+
+	  Say N if unsure.
+
 config KERNEL_KALLSYMS
 	bool "Compile the kernel with symbol table information"
 	default y if !SMALL_FLASH
diff --git a/target/linux/generic/config-6.6 b/target/linux/generic/config-6.6
index 9eec780b53..105dc0d344 100644
--- a/target/linux/generic/config-6.6
+++ b/target/linux/generic/config-6.6
@@ -4758,6 +4758,7 @@ CONFIG_PROC_SYSCTL=y
 # CONFIG_PSB6970_PHY is not set
 # CONFIG_PSE_CONTROLLER is not set
 # CONFIG_PSI is not set
+# CONFIG_PSI_DEFAULT_DISABLED is not set
 # CONFIG_PSTORE is not set
 # CONFIG_PSTORE_BLK is not set
 # CONFIG_PSTORE_COMPRESS is not set