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Bug #12604

w needs to use line name instead of pid

Added by Yuri Pankov 3 months ago. Updated 14 days ago.

Status:
Closed
Priority:
Normal
Assignee:
Yuri Pankov
Category:
cmd - userland programs
Start date:
Due date:
% Done:

100%

Estimated time:
Difficulty:
Bite-size
Tags:
Gerrit CR:
587

Description

Currently w does the following to calculate the JCPU/PCPU values and find most interesting process for the terminal:

1. Get the records from utmpx.
2. For every entry, use the recorded PID to find all children and calculate the values.

This fails in e.g. tmux (with libutempter) or screen case as the PID will be the same for all terminals under the program control. To fix this, we should match the actual terminal processes belong to instead.

History

#1

Updated by Electric Monk 19 days ago

  • Gerrit CR set to 587
#2

Updated by Yuri Pankov 17 days ago

To test this I used tmux built with utempter support, and checked that `w` output corresponds to what is actually running in tmux panes.

#3

Updated by Joshua M. Clulow 17 days ago

From Yuri:

Output before the change:

$ sudo ~/ws/tosol/proto/root_i386/usr/bin/w
15:11:40    up 3 day(s),  2:42,  1 user,  load average: 0.04, 0.12, 0.07
User     tty      login@         idle    JCPU    PCPU what
ypankov  pts/1    10:01:57          0       1       1 tmux at
ypankov  pts/2    Sat 12:33      5:10 5:43:15    5:18 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/3    Sat 12:34         0       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/4    Sun 11:56   0:46:14       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/5    Sun 14:15   0:43:15       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/6    Sun 16:16   0:43:00       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/7    Sun 18:08   0:40:54       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/8    Sun 18:11   0:43:13       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/9    Sun 18:58   0:44:13       0       0 /home/ypankov/ws/tosol/proto/roo
ypankov  pts/10   Sun 22:17     27:24       0       0 /home/ypankov/ws/tosol/proto/roo

Output after the change:

$ w
15:11:51    up 3 day(s),  2:42,  1 user,  load average: 0.04, 0.12, 0.07
User     tty      login@         idle    JCPU    PCPU what
ypankov  pts/1    10:01:57          0       0       0 tmux at
ypankov  pts/2    Sat 12:33      5:10    2:17    2:17 irssi
ypankov  pts/3    Sat 12:34         0 1:21:50      11 w
ypankov  pts/4    Sun 11:56   0:46:14       2       0 -zsh
ypankov  pts/5    Sun 14:15   0:43:15 3:51:24       2 /bin/zsh
ypankov  pts/6    Sun 16:16   0:43:01       7       0 -zsh
ypankov  pts/7    Sun 18:08   0:40:54    4:48       2 /bin/zsh
ypankov  pts/8    Sun 18:11   0:43:13      11       0 less -ins
ypankov  pts/9    Sun 18:58   0:44:13       0       0 less -ins
ypankov  pts/10   Sun 22:17     27:25   11:35       6 vim usr.bin/make/suff.c
#4

Updated by Electric Monk 14 days ago

  • Status changed from In Progress to Closed
  • % Done changed from 10 to 100

git commit 3f764e121447070c490c9637dd5791f8c8823ee4

commit  3f764e121447070c490c9637dd5791f8c8823ee4
Author: Yuri Pankov <ypankov@tintri.com>
Date:   2020-06-30T00:56:55.000Z

    12604 w needs to use line name instead of pid
    Reviewed by: Robert Mustacchi <rm@fingolfin.org>
    Approved by: Dan McDonald <danmcd@joyent.com>

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