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kernel: enable pressure interface

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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@proton.me>
Link: https://github.com/openwrt/openwrt/pull/13819
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>
(cherry picked from commit eed39d45c2ff901b5327c7ab63c9131166e3140e)
Link: https://github.com/openwrt/openwrt/pull/17097
Signed-off-by: Petr Štetiar <ynezz@true.cz>
This commit is contained in:
John Audia 2023-10-29 04:32:21 -04:00 committed by Petr Štetiar
parent c312295b56
commit 9e73f794ad
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2 changed files with 20 additions and 0 deletions
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19
config/Config-kernel.in
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@ -333,6 +333,25 @@ if KERNEL_TASKSTATS
endif 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 config KERNEL_KALLSYMS
bool "Compile the kernel with symbol table information" bool "Compile the kernel with symbol table information"
default y if !SMALL_FLASH default y if !SMALL_FLASH

1
target/linux/generic/config-6.6
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@ -4758,6 +4758,7 @@ CONFIG_PROC_SYSCTL=y
# CONFIG_PSB6970_PHY is not set # CONFIG_PSB6970_PHY is not set
# CONFIG_PSE_CONTROLLER is not set # CONFIG_PSE_CONTROLLER is not set
# CONFIG_PSI is not set # CONFIG_PSI is not set
# CONFIG_PSI_DEFAULT_DISABLED is not set
# CONFIG_PSTORE is not set # CONFIG_PSTORE is not set
# CONFIG_PSTORE_BLK is not set # CONFIG_PSTORE_BLK is not set
# CONFIG_PSTORE_COMPRESS is not set # CONFIG_PSTORE_COMPRESS is not set