Date: Sun, 29 Sep 2002 23:31:26 -0700 (PDT) From: Julian Elischer <julian@elischer.org> To: FreeBSD current users <current@FreeBSD.ORG> Subject: amusing KSE ktrace. Message-ID: <Pine.BSF.4.21.0209292322010.74299-100000@InterJet.elischer.org>
next in thread | raw e-mail | index | archive | help
It occured to me to day to look at several KSE threads running under
ktrace..
Talk about confusing..
The key to understanding it is that the lines
RET fork 0
are actually the upcalls when a thread blocks, and they will report to
the userland scheduler all the RETs that occured since the last
RET fork 0
In any case it sure is difficult to follow :-)
(6 threads each printing one char and then sleeping)
17595 ksetest RET write 1
17595 ksetest CALL nanosleep(0x84b7fcc,0x84b7fc4)
17595 ksetest CALL nanosleep(0x84a6fcc,0x84a6fc4)
17595 ksetest CALL write(0x1,0xbfbffc17,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"K"
17595 ksetest RET write 1
17595 ksetest CALL nanosleep(0x8275fcc,0x8275fc4)
17595 ksetest RET fork 0
17595 ksetest CALL nanosleep(0x8264fcc,0x8264fc4)
17595 ksetest RET fork 0
17595 ksetest CALL kse_yield
17595 ksetest CALL nanosleep(0xbfbffc10,0xbfbffc08)
17595 ksetest RET fork 0
17595 ksetest CALL kse_yield
17595 ksetest RET nanosleep 0
17595 ksetest RET nanosleep 0
17595 ksetest RET nanosleep 0
17595 ksetest RET nanosleep 0
17595 ksetest CALL write(0x1,0x84b7fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"."
17595 ksetest RET write 1
17595 ksetest CALL write(0x1,0x84a6fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"*"
17595 ksetest RET write 1
17595 ksetest CALL write(0x1,0x8264fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"+"
17595 ksetest RET write 1
17595 ksetest CALL write(0x1,0x8275fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"-"
17595 ksetest RET write 1
17595 ksetest CALL nanosleep(0x84b7fcc,0x84b7fc4)
17595 ksetest CALL nanosleep(0x84a6fcc,0x84a6fc4)
17595 ksetest CALL write(0x1,0xbfbffc17,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"L"
17595 ksetest RET write 1
17595 ksetest CALL nanosleep(0x8264fcc,0x8264fc4)
17595 ksetest RET fork 0
17595 ksetest CALL nanosleep(0x8275fcc,0x8275fc4)
17595 ksetest RET fork 0
17595 ksetest CALL kse_yield
17595 ksetest CALL nanosleep(0xbfbffc10,0xbfbffc08)
17595 ksetest RET fork 0
17595 ksetest CALL kse_yield
17595 ksetest RET nanosleep 0
17595 ksetest RET nanosleep 0
17595 ksetest RET nanosleep 0
17595 ksetest RET nanosleep 0
17595 ksetest CALL write(0x1,0x84b7fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"."
17595 ksetest RET write 1
17595 ksetest CALL write(0x1,0x84a6fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"*"
17595 ksetest RET write 1
17595 ksetest CALL write(0x1,0x8275fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"-"
17595 ksetest RET write 1
17595 ksetest CALL write(0x1,0x8264fd3,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
"+"
17595 ksetest RET write 1
17595 ksetest CALL nanosleep(0x84b7fcc,0x84b7fc4)
17595 ksetest CALL nanosleep(0x84a6fcc,0x84a6fc4)
17595 ksetest CALL write(0x1,0xbfbffc17,0x1)
17595 ksetest GIO fd 1 wrote 1 byte
To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-current" in the body of the message
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?Pine.BSF.4.21.0209292322010.74299-100000>