Date: Tue, 14 Mar 2017 15:50:36 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r315260 - stable/10/sys/kern Message-ID: <201703141550.v2EFoada015116@repo.freebsd.org>
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Author: hselasky Date: Tue Mar 14 15:50:36 2017 New Revision: 315260 URL: https://svnweb.freebsd.org/changeset/base/315260 Log: MFC r313941: Make sure the thread constructor and destructor eventhandlers are called for all threads belonging to a procedure. Currently the first thread in a procedure is kept around as an optimisation step and is never freed. Because the first thread in a procedure is never freed nor allocated, its destructor and constructor callbacks are never called which means per thread structures allocated by dtrace and the Linux emulation layers for example, might be present for threads which don't need these structures. This patch adds a thread construction and destruction call for the first thread in a procedure. Tested: dtrace, linux emulation Reviewed by: kib @ Sponsored by: Mellanox Technologies Modified: stable/10/sys/kern/kern_proc.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/kern/kern_proc.c ============================================================================== --- stable/10/sys/kern/kern_proc.c Tue Mar 14 15:49:28 2017 (r315259) +++ stable/10/sys/kern/kern_proc.c Tue Mar 14 15:50:36 2017 (r315260) @@ -191,11 +191,17 @@ static int proc_ctor(void *mem, int size, void *arg, int flags) { struct proc *p; + struct thread *td; p = (struct proc *)mem; SDT_PROBE4(proc, , ctor , entry, p, size, arg, flags); EVENTHANDLER_INVOKE(process_ctor, p); SDT_PROBE4(proc, , ctor , return, p, size, arg, flags); + td = FIRST_THREAD_IN_PROC(p); + if (td != NULL) { + /* Make sure all thread constructors are executed */ + EVENTHANDLER_INVOKE(thread_ctor, td); + } return (0); } @@ -220,6 +226,9 @@ proc_dtor(void *mem, int size, void *arg #endif /* Free all OSD associated to this thread. */ osd_thread_exit(td); + + /* Make sure all thread destructors are executed */ + EVENTHANDLER_INVOKE(thread_dtor, td); } EVENTHANDLER_INVOKE(process_dtor, p); if (p->p_ksi != NULL)
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