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Filename Latest commit message Latest commit date
Gautham R. Shenoy 1b5c6a600f pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop()
[ Upstream commit cda7ac8ce7de84cf32a3871ba5f318aa3b79381e ]

In the function mperf_start(), mperf_monitor snapshots the time, tsc
and finally the aperf,mperf MSRs. However, this order of snapshotting
in is reversed in mperf_stop(). As a result, the C0 residency (which
is computed as delta_mperf * 100 / delta_tsc) is under-reported on
CPUs that is 100% busy.

Fix this by snapshotting time, tsc and then aperf,mperf in
mperf_stop() in the same order as in mperf_start().

Link: https://lore.kernel.org/r/20250612122355.19629-2-gautham.shenoy@amd.com
Signed-off-by: Gautham R. Shenoy <gautham.shenoy@amd.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2025-08-28 16:21:25 +02:00
arch ARM: tegra: Use I/O memcpy to write to IRAM 2025-08-28 16:21:25 +02:00
block
certs
crypto
Documentation Documentation: ACPI: Fix parent device references 2025-08-28 16:21:23 +02:00
drivers usb: core: usb_submit_urb: downgrade type check 2025-08-28 16:21:25 +02:00
fs hfs: fix not erasing deleted b-tree node issue 2025-08-28 16:21:24 +02:00
include io_uring: don't use int for ABI 2025-08-28 16:21:23 +02:00
init bpfilter: match bit size of bpfilter_umh to that of the kernel 2025-07-17 18:24:51 +02:00
ipc
kernel PM: sleep: console: Fix the black screen issue 2025-08-28 16:21:25 +02:00
lib lib: test_objagg: Set error message in check_expect_hints_stats() 2025-07-17 18:24:56 +02:00
LICENSES
mm
net sctp: linearize cloned gso packets in sctp_rcv 2025-08-28 16:21:24 +02:00
samples samples: mei: Fix building on musl libc 2025-08-28 16:21:19 +02:00
scripts
security securityfs: don't pin dentries twice, once is enough... 2025-08-28 16:21:24 +02:00
sound ALSA: intel8x0: Fix incorrect codec index usage in mixer for ICH4 2025-08-28 16:21:25 +02:00
tools pm: cpupower: Fix the snapshot-order of tsc,mperf, clock in mperf_stop() 2025-08-28 16:21:25 +02:00
usr kbuild: hdrcheck: fix cross build with clang 2025-07-17 18:24:51 +02:00
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS
Makefile Linux 5.4.296 2025-07-17 18:25:06 +02:00
README

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.