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Thomas Richter 5e6c3c7b1e perf/aux: Fix tracking of auxiliary trace buffer allocation 
The following commit from the v5.4 merge window:

  d44248a413 ("perf/core: Rework memory accounting in perf_mmap()")

... breaks auxiliary trace buffer tracking.

If I run command 'perf record -e rbd000' to record samples and saving
them in the **auxiliary** trace buffer then the value of 'locked_vm' becomes
negative after all trace buffers have been allocated and released:

During allocation the values increase:

  [52.250027] perf_mmap user->locked_vm:0x87 pinned_vm:0x0 ret:0
  [52.250115] perf_mmap user->locked_vm:0x107 pinned_vm:0x0 ret:0
  [52.250251] perf_mmap user->locked_vm:0x188 pinned_vm:0x0 ret:0
  [52.250326] perf_mmap user->locked_vm:0x208 pinned_vm:0x0 ret:0
  [52.250441] perf_mmap user->locked_vm:0x289 pinned_vm:0x0 ret:0
  [52.250498] perf_mmap user->locked_vm:0x309 pinned_vm:0x0 ret:0
  [52.250613] perf_mmap user->locked_vm:0x38a pinned_vm:0x0 ret:0
  [52.250715] perf_mmap user->locked_vm:0x408 pinned_vm:0x2 ret:0
  [52.250834] perf_mmap user->locked_vm:0x408 pinned_vm:0x83 ret:0
  [52.250915] perf_mmap user->locked_vm:0x408 pinned_vm:0x103 ret:0
  [52.251061] perf_mmap user->locked_vm:0x408 pinned_vm:0x184 ret:0
  [52.251146] perf_mmap user->locked_vm:0x408 pinned_vm:0x204 ret:0
  [52.251299] perf_mmap user->locked_vm:0x408 pinned_vm:0x285 ret:0
  [52.251383] perf_mmap user->locked_vm:0x408 pinned_vm:0x305 ret:0
  [52.251544] perf_mmap user->locked_vm:0x408 pinned_vm:0x386 ret:0
  [52.251634] perf_mmap user->locked_vm:0x408 pinned_vm:0x406 ret:0
  [52.253018] perf_mmap user->locked_vm:0x408 pinned_vm:0x487 ret:0
  [52.253197] perf_mmap user->locked_vm:0x408 pinned_vm:0x508 ret:0
  [52.253374] perf_mmap user->locked_vm:0x408 pinned_vm:0x589 ret:0
  [52.253550] perf_mmap user->locked_vm:0x408 pinned_vm:0x60a ret:0
  [52.253726] perf_mmap user->locked_vm:0x408 pinned_vm:0x68b ret:0
  [52.253903] perf_mmap user->locked_vm:0x408 pinned_vm:0x70c ret:0
  [52.254084] perf_mmap user->locked_vm:0x408 pinned_vm:0x78d ret:0
  [52.254263] perf_mmap user->locked_vm:0x408 pinned_vm:0x80e ret:0

The value of user->locked_vm increases to a limit then the memory
is tracked by pinned_vm.

During deallocation the size is subtracted from pinned_vm until
it hits a limit. Then a larger value is subtracted from locked_vm
leading to a large number (because of type unsigned):

  [64.267797] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x78d
  [64.267826] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x70c
  [64.267848] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x68b
  [64.267869] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x60a
  [64.267891] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x589
  [64.267911] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x508
  [64.267933] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x487
  [64.267952] perf_mmap_close mmap_user->locked_vm:0x408 pinned_vm:0x406
  [64.268883] perf_mmap_close mmap_user->locked_vm:0x307 pinned_vm:0x406
  [64.269117] perf_mmap_close mmap_user->locked_vm:0x206 pinned_vm:0x406
  [64.269433] perf_mmap_close mmap_user->locked_vm:0x105 pinned_vm:0x406
  [64.269536] perf_mmap_close mmap_user->locked_vm:0x4 pinned_vm:0x404
  [64.269797] perf_mmap_close mmap_user->locked_vm:0xffffffffffffff84 pinned_vm:0x303
  [64.270105] perf_mmap_close mmap_user->locked_vm:0xffffffffffffff04 pinned_vm:0x202
  [64.270374] perf_mmap_close mmap_user->locked_vm:0xfffffffffffffe84 pinned_vm:0x101
  [64.270628] perf_mmap_close mmap_user->locked_vm:0xfffffffffffffe04 pinned_vm:0x0

This value sticks for the user until system is rebooted, causing
follow-on system calls using locked_vm resource limit to fail.

Note: There is no issue using the normal trace buffer.

In fact the issue is in perf_mmap_close(). During allocation auxiliary
trace buffer memory is either traced as 'extra' and added to 'pinned_vm'
or trace as 'user_extra' and added to 'locked_vm'. This applies for
normal trace buffers and auxiliary trace buffer.

However in function perf_mmap_close() all auxiliary trace buffer is
subtraced from 'locked_vm' and never from 'pinned_vm'. This breaks the
ballance.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: acme@kernel.org
Cc: gor@linux.ibm.com
Cc: hechaol@fb.com
Cc: heiko.carstens@de.ibm.com
Cc: linux-perf-users@vger.kernel.org
Cc: songliubraving@fb.com
Fixes: d44248a413 ("perf/core: Rework memory accounting in perf_mmap()")
Link: https://lkml.kernel.org/r/20191021083354.67868-1-tmricht@linux.ibm.com
[ Minor readability edits. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2019-10-21 11:31:24 +02:00
arch perf/x86/intel/pt: Fix base for single entry topa 2019-10-20 14:42:28 +02:00
block blk-wbt: fix performance regression in wbt scale_up/scale_down 2019-10-06 09:26:41 -06:00
certs PKCS#7: Refactor verify_pkcs7_signature() 2019-08-05 18:40:18 -04:00
crypto Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
Documentation hwmon fixes for v5.4-rc3 2019-10-13 08:40:31 -07:00
drivers hwmon fixes for v5.4-rc3 2019-10-13 08:40:31 -07:00
fs A few tracing fixes: 2019-10-13 14:47:10 -07:00
include hwmon fixes for v5.4-rc3 2019-10-13 08:40:31 -07:00
init Merge branch 'next-lockdown' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2019-09-28 08:14:15 -07:00
ipc ipc/sem.c: convert to use built-in RCU list checking 2019-09-25 17:51:41 -07:00
kernel perf/aux: Fix tracking of auxiliary trace buffer allocation 2019-10-21 11:31:24 +02:00
lib Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-10-12 14:46:14 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm for-linus-20191010 2019-10-11 08:45:32 -07:00
net NFS Client Bugfixes for Linux 5.4-rc3 2019-10-11 14:28:59 -07:00
samples rpmsg updates for v5.4 2019-09-22 10:58:15 -07:00
scripts A few tracing fixes: 2019-10-13 14:47:10 -07:00
security selinux/stable-5.4 PR 20191007 2019-10-08 10:51:37 -07:00
sound sound fixes for 5.4-rc1 2019-09-24 16:46:16 -07:00
tools perf kmem: Fix memory leak in compact_gfp_flags() 2019-10-16 10:08:32 -03:00
usr kbuild: update compile-test header list for v5.4-rc2 2019-10-05 15:29:49 +09:00
virt KVM/arm fixes for 5.4, take #1 2019-10-03 12:08:50 +02:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2019-09-18 12:34:53 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS MAINTAINERS: Remove Simon as Renesas SoC Co-Maintainer 2019-10-10 08:12:51 -07:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS USB fixes for 5.4-rc3 2019-10-12 15:37:12 -07:00
Makefile Linux 5.4-rc3 2019-10-13 16:37:36 -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.