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staging/lustre/obdclass: move max_dirty_mb from sysctl to sysfs

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max_dirty_mb is now a parameter in /sys/fs/lustre/

Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Drokin 2015-07-06 12:48:47 -04:00 committed by Greg Kroah-Hartman
parent e2424a1265
commit df476a4d5d
2 changed files with 46 additions and 46 deletions
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80
drivers/staging/lustre/lustre/obdclass/linux/linux-sysctl.c
View File

@ -100,48 +100,42 @@ static struct static_lustre_uintvalue_attr lustre_sattr_##name = \
LUSTRE_STATIC_UINT_ATTR(timeout, &obd_timeout);
#ifdef CONFIG_SYSCTL
static int proc_max_dirty_pages_in_mb(struct ctl_table *table, int write,
void __user *buffer, size_t *lenp, loff_t *ppos)
static ssize_t max_dirty_mb_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
int rc = 0;
if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
*lenp = 0;
return 0;
}
if (write) {
rc = lprocfs_write_frac_helper(buffer, *lenp,
(unsigned int *)table->data,
1 << (20 - PAGE_CACHE_SHIFT));
/* Don't allow them to let dirty pages exceed 90% of system
* memory and set a hard minimum of 4MB. */
if (obd_max_dirty_pages > ((totalram_pages / 10) * 9)) {
CERROR("Refusing to set max dirty pages to %u, which is more than 90%% of available RAM; setting to %lu\n",
obd_max_dirty_pages,
((totalram_pages / 10) * 9));
obd_max_dirty_pages = (totalram_pages / 10) * 9;
} else if (obd_max_dirty_pages < 4 << (20 - PAGE_CACHE_SHIFT)) {
obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
}
} else {
char buf[21];
int len;
len = lprocfs_read_frac_helper(buf, sizeof(buf),
*(unsigned int *)table->data,
1 << (20 - PAGE_CACHE_SHIFT));
if (len > *lenp)
len = *lenp;
buf[len] = '\0';
if (copy_to_user(buffer, buf, len))
return -EFAULT;
*lenp = len;
}
*ppos += *lenp;
return rc;
return sprintf(buf, "%ul\n",
obd_max_dirty_pages / (1 << (20 - PAGE_CACHE_SHIFT)));
}
static ssize_t max_dirty_mb_store(struct kobject *kobj, struct attribute *attr,
const char *buffer, size_t count)
{
int rc;
unsigned long val;
rc = kstrtoul(buffer, 10, &val);
if (rc)
return rc;
val *= 1 << (20 - PAGE_CACHE_SHIFT); /* convert to pages */
if (val > ((totalram_pages / 10) * 9)) {
/* Somebody wants to assign too much memory to dirty pages */
return -EINVAL;
}
if (val < 4 << (20 - PAGE_CACHE_SHIFT)) {
/* Less than 4 Mb for dirty cache is also bad */
return -EINVAL;
}
obd_max_dirty_pages = val;
return count;
}
LUSTRE_RW_ATTR(max_dirty_mb);
#ifdef CONFIG_SYSCTL
static struct ctl_table obd_table[] = {
{
.procname = "debug_peer_on_timeout",
@ -164,13 +158,6 @@ static struct ctl_table obd_table[] = {
.mode = 0644,
.proc_handler = &proc_dointvec
},
{
.procname = "max_dirty_mb",
.data = &obd_max_dirty_pages,
.maxlen = sizeof(int),
.mode = 0644,
.proc_handler = &proc_max_dirty_pages_in_mb
},
{
.procname = "at_min",
.data = &at_min,
@ -223,6 +210,7 @@ static struct ctl_table parent_table[] = {
static struct attribute *lustre_attrs[] = {
&lustre_sattr_timeout.u.attr,
&lustre_attr_max_dirty_mb.attr,
NULL,
};

12
drivers/staging/lustre/sysfs-fs-lustre
View File

@ -52,6 +52,18 @@ Description:
AT (adaptive timeouts).
Unit: seconds, default: 100
What: /sys/fs/lustre/max_dirty_mb
Date: June 2015
Contact: "Oleg Drokin" <oleg.drokin@intel.com>
Description:
Controls total number of dirty cache (in megabytes) allowed
across all mounted lustre filesystems.
Since writeout of dirty pages in Lustre is somewhat expensive,
when you allow to many dirty pages, this might lead to
performance degradations as kernel tries to desperately
find some pages to free/writeout.
Default 1/2 RAM. Min value 4, max value 9/10 of RAM.
What: /sys/fs/lustre/llite/<fsname>-<uuid>/blocksize
Date: May 2015
Contact: "Oleg Drokin" <oleg.drokin@intel.com>