Author: mjg Date: Thu Jul 10 20:59:54 2014 New Revision: 268505 URL: http://svnweb.freebsd.org/changeset/base/268505
Log: Avoid relocking filedesc lock when closing fds during fdp destruction. Don't call bzero nor fdunused from fdfree for such cases. It would do unnecessary work and complain that the lock is not taken. MFC after: 1 week Modified: head/sys/kern/kern_descrip.c Modified: head/sys/kern/kern_descrip.c ============================================================================== --- head/sys/kern/kern_descrip.c Thu Jul 10 20:55:38 2014 (r268504) +++ head/sys/kern/kern_descrip.c Thu Jul 10 20:59:54 2014 (r268505) @@ -294,18 +294,36 @@ fdunused(struct filedesc *fdp, int fd) /* * Free a file descriptor. + * + * Avoid some work if fdp is about to be destroyed. */ static inline void -fdfree(struct filedesc *fdp, int fd) +_fdfree(struct filedesc *fdp, int fd, int last) { struct filedescent *fde; fde = &fdp->fd_ofiles[fd]; filecaps_free(&fde->fde_caps); + if (last) + return; bzero(fde, sizeof(*fde)); fdunused(fdp, fd); } +static inline void +fdfree(struct filedesc *fdp, int fd) +{ + + _fdfree(fdp, fd, 0); +} + +static inline void +fdfree_last(struct filedesc *fdp, int fd) +{ + + _fdfree(fdp, fd, 1); +} + /* * System calls on descriptors. */ @@ -2011,36 +2029,34 @@ fdescfree(struct thread *td) FILEDESC_XLOCK(fdp); i = --fdp->fd_refcnt; - FILEDESC_XUNLOCK(fdp); - if (i > 0) + if (i > 0) { + FILEDESC_XUNLOCK(fdp); return; + } + + fdp->fd_nfiles = 0; + + cdir = fdp->fd_cdir; + fdp->fd_cdir = NULL; + rdir = fdp->fd_rdir; + fdp->fd_rdir = NULL; + jdir = fdp->fd_jdir; + fdp->fd_jdir = NULL; + FILEDESC_XUNLOCK(fdp); for (i = 0; i <= fdp->fd_lastfile; i++) { fp = fdp->fd_ofiles[i].fde_file; if (fp != NULL) { - FILEDESC_XLOCK(fdp); - fdfree(fdp, i); - FILEDESC_XUNLOCK(fdp); + fdfree_last(fdp, i); (void) closef(fp, td); } } - FILEDESC_XLOCK(fdp); if (fdp->fd_nfiles > NDFILE) free(fdp->fd_ofiles, M_FILEDESC); if (NDSLOTS(fdp->fd_nfiles) > NDSLOTS(NDFILE)) free(fdp->fd_map, M_FILEDESC); - fdp->fd_nfiles = 0; - - cdir = fdp->fd_cdir; - fdp->fd_cdir = NULL; - rdir = fdp->fd_rdir; - fdp->fd_rdir = NULL; - jdir = fdp->fd_jdir; - fdp->fd_jdir = NULL; - FILEDESC_XUNLOCK(fdp); - if (cdir != NULL) vrele(cdir); if (rdir != NULL) _______________________________________________ svn-src-all@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"