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Commit 1efff914 authored by Theodore Ts'o's avatar Theodore Ts'o
Browse files

fs: add dirtytime_expire_seconds sysctl 



Add a tuning knob so we can adjust the dirtytime expiration timeout,
which is very useful for testing lazytime.

Signed-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
parent a2f48706

fs/fs-writeback.c

+11 −0
Original line number Diff line number Diff line
@@ -1188,6 +1188,17 @@ static int __init start_dirtytime_writeback(void) 
}

__initcall(start_dirtytime_writeback);



int dirtytime_interval_handler(struct ctl_table *table, int write,

			       void __user *buffer, size_t *lenp, loff_t *ppos)

{

	int ret;



	ret = proc_dointvec_minmax(table, write, buffer, lenp, ppos);

	if (ret == 0 && write)

		mod_delayed_work(system_wq, &dirtytime_work, 0);

	return ret;

}



static noinline void block_dump___mark_inode_dirty(struct inode *inode)

{

	if (inode->i_ino || strcmp(inode->i_sb->s_id, "bdev")) {

include/linux/writeback.h

+3 −0
Original line number Diff line number Diff line
@@ -130,6 +130,7 @@ extern int vm_dirty_ratio; 
extern unsigned long vm_dirty_bytes;

extern unsigned int dirty_writeback_interval;

extern unsigned int dirty_expire_interval;

extern unsigned int dirtytime_expire_interval;

extern int vm_highmem_is_dirtyable;

extern int block_dump;

extern int laptop_mode;
@@ -146,6 +147,8 @@ extern int dirty_ratio_handler(struct ctl_table *table, int write, 
extern int dirty_bytes_handler(struct ctl_table *table, int write,

		void __user *buffer, size_t *lenp,

		loff_t *ppos);

int dirtytime_interval_handler(struct ctl_table *table, int write,

			       void __user *buffer, size_t *lenp, loff_t *ppos);



struct ctl_table;

int dirty_writeback_centisecs_handler(struct ctl_table *, int,

kernel/sysctl.c

+8 −0
Original line number Diff line number Diff line
@@ -1227,6 +1227,14 @@ static struct ctl_table vm_table[] = { 
		.proc_handler	= proc_dointvec_minmax,

		.extra1		= &zero,

	},

	{

		.procname	= "dirtytime_expire_seconds",

		.data		= &dirtytime_expire_interval,

		.maxlen		= sizeof(dirty_expire_interval),

		.mode		= 0644,

		.proc_handler	= dirtytime_interval_handler,

		.extra1		= &zero,

	},

	{

		.procname       = "nr_pdflush_threads",

		.mode           = 0444 /* read-only */,