Date: Thu, 16 May 2019 05:29:55 +0000 (UTC) From: Ryan Libby <rlibby@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r347646 - head/sys/ddb Message-ID: <201905160529.x4G5Ttk2017967@repo.freebsd.org>
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Author: rlibby Date: Thu May 16 05:29:54 2019 New Revision: 347646 URL: https://svnweb.freebsd.org/changeset/base/347646 Log: db show thread: avoid overflow in tick conversion The previous calculations for displaying the time since last switch easily overflowed, after less than 36 min for hz=1000. Now overflow takes 2000 times longer (as long as ticks takes to wrap). Reviewed by: cem, markj Sponsored by: Dell EMC Isilon Differential revision: https://reviews.freebsd.org/D20273 Modified: head/sys/ddb/db_ps.c Modified: head/sys/ddb/db_ps.c ============================================================================== --- head/sys/ddb/db_ps.c Thu May 16 04:24:08 2019 (r347645) +++ head/sys/ddb/db_ps.c Thu May 16 05:29:54 2019 (r347646) @@ -338,8 +338,8 @@ DB_SHOW_COMMAND(thread, db_show_thread) { struct thread *td; struct lock_object *lock; + u_int delta; bool comma; - int delta; /* Determine which thread to examine. */ if (have_addr) @@ -421,14 +421,14 @@ DB_SHOW_COMMAND(thread, db_show_thread) db_printf(" priority: %d\n", td->td_priority); db_printf(" container lock: %s (%p)\n", lock->lo_name, lock); if (td->td_swvoltick != 0) { - delta = (u_int)ticks - (u_int)td->td_swvoltick; - db_printf(" last voluntary switch: %d ms ago\n", - 1000 * delta / hz); + delta = ticks - td->td_swvoltick; + db_printf(" last voluntary switch: %u.%03u s ago\n", + delta / hz, (delta % hz) * 1000 / hz); } if (td->td_swinvoltick != 0) { - delta = (u_int)ticks - (u_int)td->td_swinvoltick; - db_printf(" last involuntary switch: %d ms ago\n", - 1000 * delta / hz); + delta = ticks - td->td_swinvoltick; + db_printf(" last involuntary switch: %u.%03u s ago\n", + delta / hz, (delta % hz) * 1000 / hz); } }
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