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Kan Liang 82ad50c112 perf/core: Flush PMU internal buffers for per-CPU events 
[ Upstream commit a5398bffc01fe044848c5024e5e867e407f239b8 ]

Sometimes the PMU internal buffers have to be flushed for per-CPU events
during a context switch, e.g., large PEBS. Otherwise, the perf tool may
report samples in locations that do not belong to the process where the
samples are processed in, because PEBS does not tag samples with PID/TID.

The current code only flush the buffers for a per-task event. It doesn't
check a per-CPU event.

Add a new event state flag, PERF_ATTACH_SCHED_CB, to indicate that the
PMU internal buffers have to be flushed for this event during a context
switch.

Add sched_cb_entry and perf_sched_cb_usages back to track the PMU/cpuctx
which is required to be flushed.

Only need to invoke the sched_task() for per-CPU events in this patch.
The per-task events have been handled in perf_event_context_sched_in/out
already.

Fixes: 9c964efa43 ("perf/x86/intel: Drain the PEBS buffer during context switches")
Reported-by: Gabriel Marin <gmx@google.com>
Originally-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lkml.kernel.org/r/20201130193842.10569-1-kan.liang@linux.intel.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-03-17 17:06:34 +01:00
arch arm64: mm: use a 48-bit ID map when possible on 52-bit VA builds 2021-03-17 17:06:34 +01:00
block block: Discard page cache of zone reset target range 2021-03-17 17:06:27 +01:00
certs
crypto
Documentation drivers/base/memory: don't store phys_device in memory blocks 2021-03-17 17:06:25 +01:00
drivers nvme-fc: fix racing controller reset and create association 2021-03-17 17:06:34 +01:00
fs configfs: fix a use-after-free in __configfs_open_file 2021-03-17 17:06:34 +01:00
include perf/core: Flush PMU internal buffers for per-CPU events 2021-03-17 17:06:34 +01:00
init
ipc
kernel perf/core: Flush PMU internal buffers for per-CPU events 2021-03-17 17:06:34 +01:00
lib kasan: fix memory corruption in kasan_bitops_tags test 2021-03-17 17:06:25 +01:00
LICENSES
mm arm64: mte: Map hotplugged memory as Normal Tagged 2021-03-17 17:06:28 +01:00
net SUNRPC: Set memalloc_nofs_save() for sync tasks 2021-03-17 17:06:33 +01:00
samples samples, bpf: Add missing munmap in xdpsock 2021-03-17 17:06:12 +01:00
scripts
security Revert 95ebabde382c ("capabilities: Don't allow writing ambiguous v3 file capabilities") 2021-03-17 17:06:27 +01:00
sound ALSA: usb-audio: fix use after free in usb_audio_disconnect 2021-03-17 17:06:27 +01:00
tools perf report: Fix -F for branch & mem modes 2021-03-17 17:06:17 +01:00
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Makefile kbuild: clamp SUBLEVEL to 255 2021-03-17 17:06:25 +01:00
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.