/* * JFFS2 -- Journalling Flash File System, Version 2. * * Copyright © 2001-2007 Red Hat, Inc. * Copyright © 2004-2010 David Woodhouse * * Created by David Woodhouse * * For licensing information, see the file 'LICENCE' in this directory. * */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt #include #include #include #include #include #include #include #include "nodelist.h" static int jffs2_garbage_collect_thread(void *); void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c) { assert_spin_locked(&c->erase_completion_lock); if (c->gc_task && jffs2_thread_should_wake(c)) send_sig(SIGHUP, c->gc_task, 1); } /* This must only ever be called when no GC thread is currently running */ int jffs2_start_garbage_collect_thread(struct jffs2_sb_info *c) { struct task_struct *tsk; int ret = 0; BUG_ON(c->gc_task); init_completion(&c->gc_thread_start); init_completion(&c->gc_thread_exit); tsk = kthread_run(jffs2_garbage_collect_thread, c, "jffs2_gcd_mtd%d", c->mtd->index); if (IS_ERR(tsk)) { pr_warn("fork failed for JFFS2 garbage collect thread: %ld\n", -PTR_ERR(tsk)); complete(&c->gc_thread_exit); ret = PTR_ERR(tsk); } else { /* Wait for it... */ jffs2_dbg(1, "Garbage collect thread is pid %d\n", tsk->pid); wait_for_completion(&c->gc_thread_start); ret = tsk->pid; } return ret; } void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c) { int wait = 0; spin_lock(&c->erase_completion_lock); if (c->gc_task) { jffs2_dbg(1, "Killing GC task %d\n", c->gc_task->pid); send_sig(SIGKILL, c->gc_task, 1); wait = 1; } spin_unlock(&c->erase_completion_lock); if (wait) wait_for_completion(&c->gc_thread_exit); } static int jffs2_garbage_collect_thread(void *_c) { struct jffs2_sb_info *c = _c; sigset_t hupmask; siginitset(&hupmask, sigmask(SIGHUP)); allow_signal(SIGKILL); allow_signal(SIGSTOP); allow_signal(SIGHUP); c->gc_task = current; complete(&c->gc_thread_start); set_user_nice(current, 10); set_freezable(); for (;;) { sigprocmask(SIG_UNBLOCK, &hupmask, NULL); again: spin_lock(&c->erase_completion_lock); if (!jffs2_thread_should_wake(c)) { set_current_state (TASK_INTERRUPTIBLE); spin_unlock(&c->erase_completion_lock); jffs2_dbg(1, "%s(): sleeping...\n", __func__); schedule(); } else { spin_unlock(&c->erase_completion_lock); } /* Problem - immediately after bootup, the GCD spends a lot * of time in places like jffs2_kill_fragtree(); so much so * that userspace processes (like gdm and X) are starved * despite plenty of cond_resched()s and renicing. Yield() * doesn't help, either (presumably because userspace and GCD * are generally competing for a higher latency resource - * disk). * This forces the GCD to slow the hell down. Pulling an * inode in with read_inode() is much preferable to having * the GC thread get there first. */ schedule_timeout_interruptible(msecs_to_jiffies(50)); if (kthread_should_stop()) { jffs2_dbg(1, "%s(): kthread_stop() called\n", __func__); goto die; } /* Put_super will send a SIGKILL and then wait on the sem. */ while (signal_pending(current) || freezing(current)) { unsigned long signr; if (try_to_freeze()) goto again; signr = kernel_dequeue_signal(NULL); switch(signr) { case SIGSTOP: jffs2_dbg(1, "%s(): SIGSTOP received\n", __func__); kernel_signal_stop(); break; case SIGKILL: jffs2_dbg(1, "%s(): SIGKILL received\n", __func__); goto die; case SIGHUP: jffs2_dbg(1, "%s(): SIGHUP received\n", __func__); break; default: jffs2_dbg(1, "%s(): signal %ld received\n", __func__, signr); } } /* We don't want SIGHUP to interrupt us. STOP and KILL are OK though. */ sigprocmask(SIG_BLOCK, &hupmask, NULL); jffs2_dbg(1, "%s(): pass\n", __func__); if (jffs2_garbage_collect_pass(c) == -ENOSPC) { pr_notice("No space for garbage collection. Aborting GC thread\n"); goto die; } } die: spin_lock(&c->erase_completion_lock); c->gc_task = NULL; spin_unlock(&c->erase_completion_lock); complete_and_exit(&c->gc_thread_exit, 0); } it/tree/tools/perf/util/alias.c?id=661091093918657ab544fb8ca91a5ab172a986dc'>alias.c1471logplain -rw-r--r--annotate.c44411logplain -rw-r--r--annotate.h5583logplain -rw-r--r--auxtrace.c47774logplain -rw-r--r--auxtrace.h22142logplain -rw-r--r--block-range.c6948logplain -rw-r--r--block-range.h1607logplain -rw-r--r--bpf-loader.c40787logplain -rw-r--r--bpf-loader.h6215logplain -rw-r--r--bpf-prologue.c11226logplain -rw-r--r--bpf-prologue.h847logplain -rw-r--r--build-id.c19054logplain -rw-r--r--build-id.h1859logplain d---------c++184logplain -rw-r--r--cache.h733logplain -rw-r--r--call-path.c2893logplain -rw-r--r--call-path.h2203logplain -rw-r--r--callchain.c29332logplain -rw-r--r--callchain.h7881logplain -rw-r--r--cgroup.c3195logplain -rw-r--r--cgroup.h359logplain -rw-r--r--cloexec.c1950logplain -rw-r--r--cloexec.h251logplain -rw-r--r--color.c4787logplain -rw-r--r--color.h1647logplain -rw-r--r--comm.c2239logplain -rw-r--r--comm.h561logplain -rw-r--r--config.c16262logplain -rw-r--r--config.h2113logplain -rw-r--r--counts.c1026logplain -rw-r--r--counts.h790logplain -rw-r--r--cpumap.c12627logplain -rw-r--r--cpumap.h1954logplain -rw-r--r--cs-etm.h2061logplain -rw-r--r--ctype.c2018logplain -rw-r--r--data-convert-bt.c36671logplain -rw-r--r--data-convert-bt.h302logplain -rw-r--r--data-convert.h141logplain -rw-r--r--data.c3459logplain -rw-r--r--data.h1369logplain -rw-r--r--db-export.c11434logplain -rw-r--r--db-export.h3816logplain -rw-r--r--debug.c4417logplain -rw-r--r--debug.h2023logplain -rw-r--r--demangle-java.c4219logplain -rw-r--r--demangle-java.h249logplain -rw-r--r--demangle-rust.c6602logplain -rw-r--r--demangle-rust.h170logplain -rw-r--r--drv_configs.c1834logplain -rw-r--r--drv_configs.h844logplain -rw-r--r--dso.c31994logplain -rw-r--r--dso.h10399logplain -rw-r--r--dwarf-aux.c33828logplain -rw-r--r--dwarf-aux.h5101logplain -rw-r--r--dwarf-regs.c1816logplain -rw-r--r--env.c1884logplain -rw-r--r--env.h1268logplain -rw-r--r--event.c36670logplain -rw-r--r--event.h15997logplain -rw-r--r--evlist.c47104logplain -rw-r--r--evlist.h12584logplain -rw-r--r--evsel.c63917logplain -rw-r--r--evsel.h13041logplain -rw-r--r--evsel_fprintf.c5831logplain -rw-r--r--find-vdso-map.c581logplain -rw-r--r--genelf.c11653logplain -rw-r--r--genelf.h1814logplain -rw-r--r--genelf_debug.c14374logplain -rwxr-xr-xgenerate-cmdlist.sh1141logplain -rw-r--r--group.h122logplain -rw-r--r--header.c73410logplain -rw-r--r--header.h4365logplain -rw-r--r--help-unknown-cmd.c3221logplain