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Kan Liang 950ecdc672 perf/x86/intel: Fix broken fixed event constraints extension 
Unnecessary multiplexing is triggered when running an "instructions"
event on an MTL.

perf stat -e cpu_core/instructions/,cpu_core/instructions/ -a sleep 1

 Performance counter stats for 'system wide':

       115,489,000      cpu_core/instructions/                (50.02%)
       127,433,777      cpu_core/instructions/                (49.98%)

       1.002294504 seconds time elapsed

Linux architectural perf events, e.g., cycles and instructions, usually
have dedicated fixed counters. These events also have equivalent events
which can be used in the general-purpose counters. The counters are
precious. In the intel_pmu_check_event_constraints(), perf check/extend
the event constraints of these events. So these events can utilize both
fixed counters and general-purpose counters.

The following cleanup commit:

  97588df87b ("perf/x86/intel: Add common intel_pmu_init_hybrid()")

forgot adding the intel_pmu_check_event_constraints() into update_pmu_cap().
The architectural perf events cannot utilize the general-purpose counters.

The code to check and update the counters, event constraints and
extra_regs is the same among hybrid systems. Move
intel_pmu_check_hybrid_pmus() to init_hybrid_pmu(), and
emove the duplicate check in update_pmu_cap().

Fixes: 97588df87b ("perf/x86/intel: Add common intel_pmu_init_hybrid()")
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230911135128.2322833-1-kan.liang@linux.intel.com
2023-09-12 08:22:24 +02:00
arch perf/x86/intel: Fix broken fixed event constraints extension 2023-09-12 08:22:24 +02:00
block v6.6-vfs.super 2023-08-28 11:04:18 -07:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto crypto: fix uninit-value in af_alg_free_resources 2023-08-18 18:30:09 +08:00
Documentation Scheduler changes for v6.6: 2023-08-28 16:43:39 -07:00
drivers Perf events changes for v6.6: 2023-08-28 16:35:01 -07:00
fs pstore updates for v6.6-rc1 2023-08-28 12:36:04 -07:00
include Scheduler changes for v6.6: 2023-08-28 16:43:39 -07:00
init Scheduler changes for v6.6: 2023-08-28 16:43:39 -07:00
io_uring New code for 6.6: 2023-08-28 11:59:52 -07:00
ipc mqueue: convert to ctime accessor functions 2023-07-24 10:30:07 +02:00
kernel Misc x86 cleanups. 2023-08-28 17:05:58 -07:00
lib Simplify the locking self-tests via using the new <linux/cleanup.h> 2023-08-28 16:32:09 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm for-6.6-tag 2023-08-28 12:26:57 -07:00
net v6.6-vfs.ctime 2023-08-28 09:31:32 -07:00
rust rust: macros: vtable: fix HAS_* redefinition (gen_const_name) 2023-08-09 21:15:07 +02:00
samples samples: ftrace: Replace bti assembly with hint for older compiler 2023-08-21 22:03:58 -04:00
scripts RCU pull request for v6.6 2023-08-28 13:19:28 -07:00
security hardening updates for v6.6-rc1 2023-08-28 12:59:45 -07:00
sound ASoC: Quirk for v6.5 2023-08-25 09:43:49 +02:00
tools Perf events changes for v6.6: 2023-08-28 16:35:01 -07:00
usr initramfs: Encode dependency on KBUILD_BUILD_TIMESTAMP 2023-06-06 17:54:49 +09:00
virt KVM: Grab a reference to KVM for VM and vCPU stats file descriptors 2023-07-29 11:05:28 -04:00
.clang-format iommu: Add for_each_group_device() 2023-05-23 08:15:51 +02:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: set diff driver for Rust source code files 2023-05-31 17:48:25 +02:00
.gitignore Revert ".gitignore: ignore *.cover and *.mbx" 2023-07-04 15:05:12 -07:00
.mailmap mailmap: add entries for Simon Horman 2023-08-16 09:53:10 +01:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS - Address -Wmissing-prototype warnings 2023-06-26 16:43:54 -07:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS Scheduler changes for v6.6: 2023-08-28 16:43:39 -07:00
Makefile Linux 6.5 2023-08-27 14:49:51 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

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.