Date: Thu, 20 May 2021 18:01:55 +0200 From: Michael Gmelin <freebsd@grem.de> To: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Reducing SIGINFO verbosity Message-ID: <20210520180155.3e23500e@bsd64.grem.de>
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Hi, I'm leaving this here, mostly so that others (or future me) can google it up. Traditionally, CTRL-t would give a one-line output + whatever the process specific signal handler comes up with: # sleep 120 <--- hits CTRL-t load: 0.27 cmd: sleep 38162 [nanslp] 0.64r 0.00u 0.00s 0% 1780k sleep: about 119 second(s) left out of the original 120 # cat <--- hits CTRL-t load: 0.02 cmd: cat 24379 [ttyin] 0.63r 0.00u 0.00s 0% 2308k On 13 I get: # sleep 120 <--- hits CTRL-t load: 0.12 cmd: sleep 3241 [nanslp] 0.52r 0.00u 0.00s 0% 2172k mi_switch+0xc1 sleepq_catch_signals+0x2e6 sleepq_timedwait_sig+0x12 _sleep+0x199 kern_clock_nanosleep+0x1e1 sys_nanosleep+0x3b amd64_syscall+0x10c fast_syscall_common+0xf8 sleep: about 119 second(s) left out of the original 120 # cat <--- hits CTRL-t load: 0.09 cmd: cat 3240 [ttyin] 0.23r 0.00u 0.00s 0% 2300k mi_switch+0xc1 sleepq_catch_signals+0x2e6 sleepq_wait_sig+0x9 _cv_wait_sig+0xe4 tty_wait+0x1c ttydisc_read+0x2ac ttydev_read+0x56 devfs_read_f+0xd5 dofileread+0x81 sys_read+0xbc amd64_syscall+0x10c fast_syscall_common+0xf8 which is quite way too verbose when checking the progress of long-running processes, like cp, dd, or poudriere. Especially as CTRL-t is part of the user experience to me - I use it to interact with the machine outside of debugging software issues. Setting sysctl kern.tty_info_kstacks=0 echo kern.tty_info_kstacks=0 >>/etc/sysctl.conf fixes this permanently. Apparently, this was enabled by default on purpose[0], so that people find the feature (which certainly worked ^_^), but I think it would been worth mentioning the sysctl somewhere in the release notes/errata, so that people understand how to disable it again. Best Michael [0]https://cgit.freebsd.org/src/commit/sys/kern/tty_info.c?h=releng/13.0&id=508a6e84e785f642545b81c3ecb325685a2e56a7 -- Michael Gmelin
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