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[GFS2] Reduce number of gfs2_scand processes to one

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We only need a single gfs2_scand process rather than the one
per filesystem which we had previously. As a result the parameter
determining the frequency of gfs2_scand runs becomes a module
parameter rather than a mount parameter as it was before.

Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
This commit is contained in:
Steven Whitehouse
2007-08-01 13:57:10 +01:00
parent ca5a939b33
commit 8fbbfd214c
10 changed files with 53 additions and 57 deletions
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63
fs/gfs2/glock.c
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@@ -25,6 +25,8 @@
#include <asm/uaccess.h>
#include <linux/seq_file.h>
#include <linux/debugfs.h>
#include <linux/kthread.h>
#include <linux/freezer.h>
#include "gfs2.h"
#include "incore.h"
@@ -58,6 +60,8 @@ static void gfs2_glock_xmote_th(struct gfs2_glock *gl, struct gfs2_holder *gh);
static void gfs2_glock_drop_th(struct gfs2_glock *gl);
static DECLARE_RWSEM(gfs2_umount_flush_sem);
static struct dentry *gfs2_root;
static struct task_struct *scand_process;
static unsigned int scand_secs = 5;
#define GFS2_GL_HASH_SHIFT 15
#define GFS2_GL_HASH_SIZE (1 << GFS2_GL_HASH_SHIFT)
@@ -1627,7 +1631,7 @@ static int examine_bucket(glock_examiner examiner, struct gfs2_sbd *sdp,
goto out;
gl = list_entry(head->first, struct gfs2_glock, gl_list);
while(1) {
if (gl->gl_sbd == sdp) {
if (!sdp || gl->gl_sbd == sdp) {
gfs2_glock_hold(gl);
read_unlock(gl_lock_addr(hash));
if (prev)
@@ -1645,6 +1649,7 @@ out:
read_unlock(gl_lock_addr(hash));
if (prev)
gfs2_glock_put(prev);
cond_resched();
return has_entries;
}
@@ -1672,20 +1677,6 @@ out_schedule:
gfs2_glock_schedule_for_reclaim(gl);
}
/**
* gfs2_scand_internal - Look for glocks and inodes to toss from memory
* @sdp: the filesystem
*
*/
void gfs2_scand_internal(struct gfs2_sbd *sdp)
{
unsigned int x;
for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
examine_bucket(scan_glock, sdp, x);
}
/**
* clear_glock - look at a glock and see if we can free it from glock cache
* @gl: the glock to look at
@@ -1973,6 +1964,35 @@ static int gfs2_dump_lockstate(struct gfs2_sbd *sdp)
return error;
}
/**
* gfs2_scand - Look for cached glocks and inodes to toss from memory
* @sdp: Pointer to GFS2 superblock
*
* One of these daemons runs, finding candidates to add to sd_reclaim_list.
* See gfs2_glockd()
*/
static int gfs2_scand(void *data)
{
unsigned x;
unsigned delay;
while (!kthread_should_stop()) {
for (x = 0; x < GFS2_GL_HASH_SIZE; x++)
examine_bucket(scan_glock, NULL, x);
if (freezing(current))
refrigerator();
delay = scand_secs;
if (delay < 1)
delay = 1;
schedule_timeout_interruptible(delay * HZ);
}
return 0;
}
int __init gfs2_glock_init(void)
{
unsigned i;
@@ -1984,9 +2004,22 @@ int __init gfs2_glock_init(void)
rwlock_init(&gl_hash_locks[i]);
}
#endif
scand_process = kthread_run(gfs2_scand, NULL, "gfs2_scand");
if (IS_ERR(scand_process))
return PTR_ERR(scand_process);
return 0;
}
void gfs2_glock_exit(void)
{
kthread_stop(scand_process);
}
module_param(scand_secs, uint, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(scand_secs, "The number of seconds between scand runs");
static int gfs2_glock_iter_next(struct glock_iter *gi)
{
struct gfs2_glock *gl;