Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756792AbYGFPTq (ORCPT ); Sun, 6 Jul 2008 11:19:46 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756531AbYGFPTY (ORCPT ); Sun, 6 Jul 2008 11:19:24 -0400 Received: from x346.tv-sign.ru ([89.108.83.215]:48089 "EHLO mail.screens.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756055AbYGFPTX (ORCPT ); Sun, 6 Jul 2008 11:19:23 -0400 Date: Sun, 6 Jul 2008 19:22:22 +0400 From: Oleg Nesterov To: Andrew Morton Cc: Roland McGrath , linux-kernel@vger.kernel.org Subject: [PATCH 3/4] coredump: simplify core_state->nr_threads calculation Message-ID: <20080706152222.GA2822@tv-sign.ru> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.11 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3056 Lines: 107 Change zap_process() to return int instead of incrementing mm->core_state->nr_threads directly. Change zap_threads() to set mm->core_state only on success. This patch restores the original size of .text, and more importantly now ->nr_threads is used in two places only. Signed-off-by: Oleg Nesterov exec.c | 33 ++++++++++++++++----------------- 1 files changed, 16 insertions(+), 17 deletions(-) --- 26-rc2/fs/exec.c~3_NR_CLEANUP 2008-06-16 16:50:13.000000000 +0400 +++ 26-rc2/fs/exec.c 2008-07-06 17:43:14.000000000 +0400 @@ -1496,9 +1496,10 @@ out: return ispipe; } -static void zap_process(struct task_struct *start) +static int zap_process(struct task_struct *start) { struct task_struct *t; + int nr = 0; start->signal->flags = SIGNAL_GROUP_EXIT; start->signal->group_stop_count = 0; @@ -1506,31 +1507,33 @@ static void zap_process(struct task_stru t = start; do { if (t != current && t->mm) { - t->mm->core_state->nr_threads++; sigaddset(&t->pending.signal, SIGKILL); signal_wake_up(t, 1); + nr++; } } while_each_thread(start, t); + + return nr; } static inline int zap_threads(struct task_struct *tsk, struct mm_struct *mm, - int exit_code) + struct core_state *core_state, int exit_code) { struct task_struct *g, *p; unsigned long flags; - int err = -EAGAIN; + int nr = -EAGAIN; spin_lock_irq(&tsk->sighand->siglock); if (!signal_group_exit(tsk->signal)) { + mm->core_state = core_state; tsk->signal->group_exit_code = exit_code; - zap_process(tsk); - err = 0; + nr = zap_process(tsk); } spin_unlock_irq(&tsk->sighand->siglock); - if (err) - return err; + if (unlikely(nr < 0)) + return nr; - if (atomic_read(&mm->mm_users) == mm->core_state->nr_threads + 1) + if (atomic_read(&mm->mm_users) == nr + 1) goto done; /* * We should find and kill all tasks which use this mm, and we should @@ -1574,7 +1577,7 @@ static inline int zap_threads(struct tas if (p->mm) { if (unlikely(p->mm == mm)) { lock_task_sighand(p, &flags); - zap_process(p); + nr += zap_process(p); unlock_task_sighand(p, &flags); } break; @@ -1583,7 +1586,8 @@ static inline int zap_threads(struct tas } rcu_read_unlock(); done: - return mm->core_state->nr_threads; + core_state->nr_threads = nr; + return nr; } static int coredump_wait(int exit_code) @@ -1596,12 +1600,7 @@ static int coredump_wait(int exit_code) init_completion(&mm->core_done); init_completion(&core_state.startup); - core_state.nr_threads = 0; - mm->core_state = &core_state; - - core_waiters = zap_threads(tsk, mm, exit_code); - if (core_waiters < 0) - mm->core_state = NULL; + core_waiters = zap_threads(tsk, mm, &core_state, exit_code); up_write(&mm->mmap_sem); if (unlikely(core_waiters < 0)) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/