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Filename Latest commit message Latest commit date
Adrian Hunter da4b6eff38 perf intel-pt: Fix recording PEBS-via-PT with registers 
[ Upstream commit 75bcb8776dc987538f267ba4ba05ca43fc2b1676 ]

When recording PEBS-via-PT, the kernel will not accept the intel_pt
event with register sampling e.g.

 # perf record --kcore -c 10000 -e '{intel_pt/branch=0/,branch-loads/aux-output/ppp}' -I -- ls -l
 Error:
 intel_pt/branch=0/: PMU Hardware doesn't support sampling/overflow-interrupts. Try 'perf stat'

Fix by suppressing register sampling on the intel_pt evsel.

Committer notes:

Adrian informed that this is only available from Tremont onwards, so on
older processors the error continues the same as before.

Fixes: 9e64cefe43 ("perf intel-pt: Process options for PEBS event synthesis")
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Luwei Kang <luwei.kang@intel.com>
Link: http://lore.kernel.org/lkml/20200630133935.11150-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2020-07-16 08:16:38 +02:00
arch x86/entry: Increase entry_stack size to a full page 2020-07-16 08:16:36 +02:00
block block: release bip in a right way in error path 2020-07-16 08:16:36 +02:00
certs
crypto crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-07-09 09:37:52 +02:00
Documentation
drivers net: dsa: microchip: set the correct number of ports 2020-07-16 08:16:38 +02:00
fs cifs: update ctime and mtime during truncate 2020-07-16 08:16:35 +02:00
include crypto: af_alg - fix use-after-free in af_alg_accept() due to bh_lock_sock() 2020-07-09 09:37:52 +02:00
init
ipc
kernel sched/core: Check cpus_mask, not cpus_ptr in __set_cpus_allowed_ptr(), to fix mask corruption 2020-07-16 08:16:36 +02:00
lib test_objagg: Fix potential memory leak in error handling 2020-06-30 15:37:04 -04:00
LICENSES
mm mm, compaction: make capture control handling safe wrt interrupts 2020-07-09 09:37:57 +02:00
net netfilter: conntrack: refetch conntrack after nf_conntrack_update() 2020-07-16 08:16:38 +02:00
samples samples/vfs: avoid warning in statx override 2020-07-09 09:37:54 +02:00
scripts recordmcount: support >64k sections 2020-06-30 15:37:05 -04:00
security
sound ALSA: hda: Intel: add missing PCI IDs for ICL-H, TGL-H and EKL 2020-07-16 08:16:33 +02:00
tools perf intel-pt: Fix recording PEBS-via-PT with registers 2020-07-16 08:16:38 +02:00
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Makefile Linux 5.4.51 2020-07-09 09:37:57 +02:00
README

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.