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Thomas Gleixner cfb104ca8a perf/core improvements and fixes: 
report/script/trace/top:
 
   Arnaldo Carvalho de Melo:
 
   - Allow specifying marker events demarcating when to consider the other events,
     i.e. one now can state something like:
 
         # perf probe kernel_function
         # perf record -e cycles,probe:kernel_function
 
     And then, in 'perf script' or 'perf report' say:
 
         # perf report --switch-on=probe:kernel_function
 
     And then the cycles event samples will be considered only after we
     find the first probe:kernel_function event.
 
     There is also --switch-off=event, to make it stop considering events
     out of some window, say to avoid some winding down of a workload.
 
     The same can be done with the "live mode" tools: 'perf top' and 'perf trace'.
 
     There are examples in the cset comments showing how to use it with
     SDT events in things like 'systemtap', that have those tracepoint-like
     events for the start/end of passes, etc.
 
     Another example involves selecting scheduler events + entry/exit of
     a syscall, using the syscalls tracepoints, one can then see the
     scheduler events that take place while that syscall is being processed.
 
     In the future this should be possible in record/top/trace via eBPF
     where the perf tools would hook into the marker events and enable events
     put in place but not enabled when the on/off conditions are the desired
     ones, reducing the amount of events sampled, but this userspace only
     solution should be good enough for many scenarios.
 
 perf vendor events intel:
 
   Haiyan Song:
 
   - Add Tremontx event file v1.02.
 
 unwind:
 
   John Keeping:
 
   - Fix callchain unwinding when tid != pid, that was working only for the
     thread group leader.
 
 Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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 commit e2736219e6
 Author: John Keeping <john@metanate.com>
 Date:   Thu Aug 15 11:01:46 2019 +0100
 
     perf unwind: Remove unnecessary test
 
     If dwarf_callchain_users is false, then unwind__prepare_access() will
     not set unwind_libunwind_ops so the remaining test here is sufficient.
 
     Signed-off-by: John Keeping <john@metanate.com>
     Reviewed-by: Jiri Olsa <jolsa@kernel.org>
     Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
     Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
     Cc: Namhyung Kim <namhyung@kernel.org>
     Cc: Peter Zijlstra <peterz@infradead.org>
     Cc: john keeping <john@metanate.com>
     Link: http://lkml.kernel.org/r/20190815100146.28842-3-john@metanate.com
     Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
 
 diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
 index b843f9d0a9ea..6499b22b158b 100644
 --- a/tools/perf/util/unwind-libunwind.c
 +++ b/tools/perf/util/unwind-libunwind.c
 @@ -69,18 +69,12 @@ int unwind__prepare_access(struct map_groups *mg, struct map *map,
 
  void unwind__flush_access(struct map_groups *mg)
  {
 -	if (!dwarf_callchain_users)
 -		return;
 -
  	if (mg->unwind_libunwind_ops)
  		mg->unwind_libunwind_ops->flush_access(mg);
  }
 
  void unwind__finish_access(struct map_groups *mg)
  {
 -	if (!dwarf_callchain_users)
 -		return;
 -
  	if (mg->unwind_libunwind_ops)
  		mg->unwind_libunwind_ops->finish_access(mg);
  }
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Merge tag 'perf-core-for-mingo-5.4-20190816' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo:

report/script/trace/top:

  Arnaldo Carvalho de Melo:

  - Allow specifying marker events demarcating when to consider the other events,
    i.e. one now can state something like:

        # perf probe kernel_function
        # perf record -e cycles,probe:kernel_function

    And then, in 'perf script' or 'perf report' say:

        # perf report --switch-on=probe:kernel_function

    And then the cycles event samples will be considered only after we
    find the first probe:kernel_function event.

    There is also --switch-off=event, to make it stop considering events
    out of some window, say to avoid some winding down of a workload.

    The same can be done with the "live mode" tools: 'perf top' and 'perf trace'.

    There are examples in the cset comments showing how to use it with
    SDT events in things like 'systemtap', that have those tracepoint-like
    events for the start/end of passes, etc.

    Another example involves selecting scheduler events + entry/exit of
    a syscall, using the syscalls tracepoints, one can then see the
    scheduler events that take place while that syscall is being processed.

    In the future this should be possible in record/top/trace via eBPF
    where the perf tools would hook into the marker events and enable events
    put in place but not enabled when the on/off conditions are the desired
    ones, reducing the amount of events sampled, but this userspace only
    solution should be good enough for many scenarios.

perf vendor events intel:

  Haiyan Song:

  - Add Tremontx event file v1.02.

unwind:

  John Keeping:

  - Fix callchain unwinding when tid != pid, that was working only for the
    thread group leader.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
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VXbpQ7byj339Wo7SpjadzLl9xPlh/Qw=
=IaYE
-----END PGP SIGNATURE-----

commit e2736219e6
Author: John Keeping <john@metanate.com>
Date:   Thu Aug 15 11:01:46 2019 +0100

    perf unwind: Remove unnecessary test

    If dwarf_callchain_users is false, then unwind__prepare_access() will
    not set unwind_libunwind_ops so the remaining test here is sufficient.

    Signed-off-by: John Keeping <john@metanate.com>
    Reviewed-by: Jiri Olsa <jolsa@kernel.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
    Cc: Namhyung Kim <namhyung@kernel.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: john keeping <john@metanate.com>
    Link: http://lkml.kernel.org/r/20190815100146.28842-3-john@metanate.com
    Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/util/unwind-libunwind.c b/tools/perf/util/unwind-libunwind.c
index b843f9d0a9ea..6499b22b158b 100644
--- a/tools/perf/util/unwind-libunwind.c
+++ b/tools/perf/util/unwind-libunwind.c
@@ -69,18 +69,12 @@ int unwind__prepare_access(struct map_groups *mg, struct map *map,

 void unwind__flush_access(struct map_groups *mg)
 {
-	if (!dwarf_callchain_users)
-		return;
-
 	if (mg->unwind_libunwind_ops)
 		mg->unwind_libunwind_ops->flush_access(mg);
 }

 void unwind__finish_access(struct map_groups *mg)
 {
-	if (!dwarf_callchain_users)
-		return;
-
 	if (mg->unwind_libunwind_ops)
 		mg->unwind_libunwind_ops->finish_access(mg);
 }
2019-08-16 22:43:42 +02:00
arch RISC-V updates for v5.3-rc4 2019-08-10 16:31:47 -07:00
block block, bfq: handle NULL return value by bfq_init_rq() 2019-08-08 07:31:50 -06:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation RISC-V updates for v5.3-rc4 2019-08-10 16:31:47 -07:00
drivers Bug fix for NTB MSI kernel compile warning 2019-08-11 10:13:53 -07:00
fs dax fixes v5.3-rc4 2019-08-11 13:15:10 -07:00
include Bugfixes (arm and x86) and cleanups. 2019-08-09 15:46:29 -07:00
init Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
ipc Merge branch 'work.mount0' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-07-19 10:42:02 -07:00
kernel Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2019-08-10 15:48:02 -07:00
lib Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net 2019-08-06 17:11:59 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm mm/memremap: Fix reuse of pgmap instances with internal references 2019-08-09 14:16:15 -07:00
net net: dsa: sja1105: Fix memory leak on meta state machine error path 2019-08-06 14:37:02 -07:00
samples treewide: remove SPDX "WITH Linux-syscall-note" from kernel-space headers again 2019-07-25 11:05:10 +02:00
scripts kbuild: show hint if subdir-y/m is used to visit module Makefile 2019-08-10 01:45:31 +09:00
security selinux/stable-5.3 PR 20190801 2019-08-02 18:40:49 -07:00
sound sound fixes for 5.3-rc4 2019-08-09 09:21:27 -07:00
tools perf unwind: Remove unnecessary test 2019-08-16 12:30:14 -03:00
usr kbuild: enable arch/s390/include/uapi/asm/zcrypt.h for uapi header test 2019-07-23 10:45:46 +02:00
virt KVM/arm fixes for 5.3, take #2 2019-08-09 16:53:50 +02:00
.clang-format Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2019-04-17 11:26:25 -07:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: set git diff driver for C source code files 2016-10-07 18:46:30 -07:00
.gitignore .gitignore: Add compilation database file 2019-07-27 12:18:19 +09:00
.mailmap MAINTAINERS: Update my email address 2019-07-22 14:57:50 +01:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS Remove references to dead website. 2019-07-19 12:22:04 -07:00
Kbuild Kbuild updates for v5.1 2019-03-10 17:48:21 -07:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS Char/misc fixes for 5.3-rc4 2019-08-10 12:24:20 -07:00
Makefile Linux 5.3-rc4 2019-08-11 13:26:41 -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.