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fe8e043487
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Namhyung Kim fe8e043487 perf script: Increase PID/TID width for output 
On large systems, it's common that PID/TID is bigger than 5-digit and it
makes the output unaligned.  Let's increase the width to 7.

Before:

  $ perf script
  ...
           swapper     0 [006] 1540823.803935:    1369324 cycles:P:  ffffffff9c755588 ktime_get+0x18 ([kernel.kallsyms])
       gvfsd-dnssd 95114 [004] 1540823.804164:    1643871 cycles:P:  ffffffff9cfdca5c __get_user_8+0x1c ([kernel.kallsyms])
         perf-exec 1558582 [000] 1540823.804209:    1018714 cycles:P:  ffffffff9c924ab9 __slab_free+0x9 ([kernel.kallsyms])
             nmcli 1558589 [007] 1540823.804384:    1859212 cycles:P:      7f70537a8ad8 __strchrnul_evex+0x18 (/usr/lib/x86_64-linux-gnu/libc.so.6>
             sleep 1558582 [000] 1540823.804456:     987425 cycles:P:      7fd35bb27b30 _dl_init+0x0 (/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2>
       dbus-daemon  3043 [003] 1540823.804575:    1564465 cycles:P:  ffffffff9cb2bb70 llist_add_batch+0x0 ([kernel.kallsyms])
             gdbus 1558592 [001] 1540823.804766:    1315219 cycles:P:  ffffffff9c797b2e audit_filter_syscall+0x9e ([kernel.kallsyms])
    NetworkManager  3452 [005] 1540823.805301:    1558782 cycles:P:      7fa957737748 g_bit_lock+0x58 (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7400.5>

After:

  $ perf script
  ...
           swapper       0 [006] 1540823.803935:    1369324 cycles:P:  ffffffff9c755588 ktime_get+0x18 ([kernel.kallsyms])
       gvfsd-dnssd   95114 [004] 1540823.804164:    1643871 cycles:P:  ffffffff9cfdca5c __get_user_8+0x1c ([kernel.kallsyms])
         perf-exec 1558582 [000] 1540823.804209:    1018714 cycles:P:  ffffffff9c924ab9 __slab_free+0x9 ([kernel.kallsyms])
             nmcli 1558589 [007] 1540823.804384:    1859212 cycles:P:      7f70537a8ad8 __strchrnul_evex+0x18 (/usr/lib/x86_64-linux-gnu/libc.so.6>
             sleep 1558582 [000] 1540823.804456:     987425 cycles:P:      7fd35bb27b30 _dl_init+0x0 (/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2>
       dbus-daemon    3043 [003] 1540823.804575:    1564465 cycles:P:  ffffffff9cb2bb70 llist_add_batch+0x0 ([kernel.kallsyms])
             gdbus 1558592 [001] 1540823.804766:    1315219 cycles:P:  ffffffff9c797b2e audit_filter_syscall+0x9e ([kernel.kallsyms])
    NetworkManager    3452 [005] 1540823.805301:    1558782 cycles:P:      7fa957737748 g_bit_lock+0x58 (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7400.5>

Reviewer notes:

Adrian added:

"Might be worth noting that currently the biggest PID_MAX_LIMIT is 2^22
 so pids don't get bigger than 7 digits presently"

$ echo $((2 ** 22))
4194304
$ echo -n $((2 ** 22)) | wc -c
7
$

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20230531203236.1602054-1-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2023-06-01 17:28:46 -03:00
arch parisc architecture fixes for kernel v6.4-rc4: 2023-05-25 18:50:18 -07:00
block block: Deny writable memory mapping if block is read-only 2023-05-19 20:17:10 -06:00
certs KEYS: Add missing function documentation 2023-04-24 16:15:52 +03:00
crypto This push fixes the following problems: 2023-05-07 10:57:14 -07:00
Documentation four smb3 client server fixes (3 also for stable) and 3 patches related to move of fs/cifs and fs/ksmbd directories to common fs/smb parent directory 2023-05-25 19:23:18 -07:00
drivers parisc architecture fixes for kernel v6.4-rc4: 2023-05-25 18:50:18 -07:00
fs four smb3 client server fixes (3 also for stable) and 3 patches related to move of fs/cifs and fs/ksmbd directories to common fs/smb parent directory 2023-05-25 19:23:18 -07:00
include module: error out early on concurrent load of the same module file 2023-05-25 17:07:57 -07:00
init Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
io_uring for-6.4/io_uring-2023-05-07 2023-05-07 10:00:09 -07:00
ipc Merge branch 'work.namespace' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2023-02-24 19:20:07 -08:00
kernel module: error out early on concurrent load of the same module file 2023-05-25 17:07:57 -07:00
lib Eight hotfixes. Four are cc:stable, the other four are for post-6.4 2023-05-18 17:06:04 -07:00
LICENSES LICENSES: Add the copyleft-next-0.3.1 license 2022-11-08 15:44:01 +01:00
mm mm: fix zswap writeback race condition 2023-05-17 15:24:33 -07:00
net Networking fixes for 6.4-rc4, including fixes from bluetooth and bpf 2023-05-25 10:55:26 -07:00
rust Rust changes for v6.4 2023-04-30 11:20:22 -07:00
samples samples/bpf: Drop unnecessary fallthrough 2023-05-16 19:44:05 +02:00
scripts Locking changes in v6.4: 2023-05-05 12:56:55 -07:00
security integrity-v6.4 2023-04-29 10:11:32 -07:00
sound ALSA: hda/realtek: Enable headset onLenovo M70/M90 2023-05-24 14:18:59 +02:00
tools perf script: Increase PID/TID width for output 2023-06-01 17:28:46 -03:00
usr initramfs: Check negative timestamp to prevent broken cpio archive 2023-04-16 17:37:01 +09:00
virt KVM: Fix vcpu_array[0] races 2023-05-19 13:56:26 -04:00
.clang-format cxl for v6.4 2023-04-30 11:51:51 -07:00
.cocciconfig
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for *.dtso files 2023-02-26 15:28:23 +09:00
.gitignore linux-kselftest-kunit-6.4-rc1 2023-04-24 12:31:32 -07:00
.mailmap mailmap: add entries for Nikolay Aleksandrov 2023-05-17 09:35:05 +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 MAINTAINERS: sctp: move Neil to CREDITS 2023-05-12 08:51:32 +01:00
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 four smb3 client server fixes (3 also for stable) and 3 patches related to move of fs/cifs and fs/ksmbd directories to common fs/smb parent directory 2023-05-25 19:23:18 -07:00
Makefile Linux 6.4-rc3 2023-05-21 14:05:48 -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.