b004157ab5
This fixes a bug which resulted in poor performance due to flushing the journal too often. The code path in question was via the inode_go_sync() function in glops.c. The solution is not to flush the journal immediately when inodes are ejected from memory, but batch up the work for glockd to deal with later on. This means that glocks may now live on beyond the end of the lifetime of their inodes (but not very much longer in the normal case). Also fixed in this patch is a bug (which was hidden by the bug mentioned above) in calculation of the number of free journal blocks. The gfs2_logd process has been altered to be more responsive to the journal filling up. We now wake it up when the number of uncommitted journal blocks has reached the threshold level rather than trying to flush directly at the end of each transaction. This again means doing fewer, but larger, log flushes in general. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
200 lines
4.5 KiB
C
200 lines
4.5 KiB
C
/*
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* Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
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* Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License version 2.
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*/
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include <linux/spinlock.h>
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#include <linux/completion.h>
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#include <linux/buffer_head.h>
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#include <linux/kthread.h>
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#include <linux/delay.h>
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#include <linux/gfs2_ondisk.h>
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#include <linux/lm_interface.h>
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#include "gfs2.h"
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#include "incore.h"
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#include "daemon.h"
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#include "glock.h"
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#include "log.h"
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#include "quota.h"
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#include "recovery.h"
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#include "super.h"
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#include "util.h"
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/* This uses schedule_timeout() instead of msleep() because it's good for
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the daemons to wake up more often than the timeout when unmounting so
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the user's unmount doesn't sit there forever.
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The kthread functions used to start these daemons block and flush signals. */
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/**
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* gfs2_scand - Look for cached glocks and inodes to toss from memory
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* @sdp: Pointer to GFS2 superblock
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*
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* One of these daemons runs, finding candidates to add to sd_reclaim_list.
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* See gfs2_glockd()
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*/
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int gfs2_scand(void *data)
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{
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struct gfs2_sbd *sdp = data;
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unsigned long t;
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while (!kthread_should_stop()) {
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gfs2_scand_internal(sdp);
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t = gfs2_tune_get(sdp, gt_scand_secs) * HZ;
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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/**
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* gfs2_glockd - Reclaim unused glock structures
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* @sdp: Pointer to GFS2 superblock
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*
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* One or more of these daemons run, reclaiming glocks on sd_reclaim_list.
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* Number of daemons can be set by user, with num_glockd mount option.
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*/
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int gfs2_glockd(void *data)
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{
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struct gfs2_sbd *sdp = data;
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while (!kthread_should_stop()) {
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while (atomic_read(&sdp->sd_reclaim_count))
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gfs2_reclaim_glock(sdp);
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wait_event_interruptible(sdp->sd_reclaim_wq,
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(atomic_read(&sdp->sd_reclaim_count) ||
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kthread_should_stop()));
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}
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return 0;
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}
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/**
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* gfs2_recoverd - Recover dead machine's journals
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* @sdp: Pointer to GFS2 superblock
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*
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*/
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int gfs2_recoverd(void *data)
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{
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struct gfs2_sbd *sdp = data;
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unsigned long t;
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while (!kthread_should_stop()) {
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gfs2_check_journals(sdp);
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t = gfs2_tune_get(sdp, gt_recoverd_secs) * HZ;
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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/**
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* gfs2_logd - Update log tail as Active Items get flushed to in-place blocks
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* @sdp: Pointer to GFS2 superblock
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*
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* Also, periodically check to make sure that we're using the most recent
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* journal index.
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*/
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int gfs2_logd(void *data)
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{
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struct gfs2_sbd *sdp = data;
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struct gfs2_holder ji_gh;
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unsigned long t;
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int need_flush;
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while (!kthread_should_stop()) {
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/* Advance the log tail */
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t = sdp->sd_log_flush_time +
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gfs2_tune_get(sdp, gt_log_flush_secs) * HZ;
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gfs2_ail1_empty(sdp, DIO_ALL);
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gfs2_log_lock(sdp);
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need_flush = sdp->sd_log_num_buf > gfs2_tune_get(sdp, gt_incore_log_blocks);
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gfs2_log_unlock(sdp);
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if (need_flush || time_after_eq(jiffies, t)) {
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gfs2_log_flush(sdp, NULL);
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sdp->sd_log_flush_time = jiffies;
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}
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/* Check for latest journal index */
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t = sdp->sd_jindex_refresh_time +
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gfs2_tune_get(sdp, gt_jindex_refresh_secs) * HZ;
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if (time_after_eq(jiffies, t)) {
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if (!gfs2_jindex_hold(sdp, &ji_gh))
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gfs2_glock_dq_uninit(&ji_gh);
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sdp->sd_jindex_refresh_time = jiffies;
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}
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t = gfs2_tune_get(sdp, gt_logd_secs) * HZ;
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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/**
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* gfs2_quotad - Write cached quota changes into the quota file
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* @sdp: Pointer to GFS2 superblock
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*
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*/
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int gfs2_quotad(void *data)
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{
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struct gfs2_sbd *sdp = data;
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unsigned long t;
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int error;
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while (!kthread_should_stop()) {
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/* Update the master statfs file */
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t = sdp->sd_statfs_sync_time +
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gfs2_tune_get(sdp, gt_statfs_quantum) * HZ;
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if (time_after_eq(jiffies, t)) {
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error = gfs2_statfs_sync(sdp);
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if (error &&
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error != -EROFS &&
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!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
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fs_err(sdp, "quotad: (1) error=%d\n", error);
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sdp->sd_statfs_sync_time = jiffies;
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}
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/* Update quota file */
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t = sdp->sd_quota_sync_time +
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gfs2_tune_get(sdp, gt_quota_quantum) * HZ;
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if (time_after_eq(jiffies, t)) {
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error = gfs2_quota_sync(sdp);
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if (error &&
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error != -EROFS &&
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!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
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fs_err(sdp, "quotad: (2) error=%d\n", error);
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sdp->sd_quota_sync_time = jiffies;
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}
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gfs2_quota_scan(sdp);
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t = gfs2_tune_get(sdp, gt_quotad_secs) * HZ;
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schedule_timeout_interruptible(t);
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}
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return 0;
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}
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