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Commit 1f13ae39 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: remove noisy remainder of the scan_unevictable interface 



The deprecation warnings for the scan_unevictable interface triggers by
scripts doing `sysctl -a | grep something else'.  This is annoying and not
helpful.

The interface has been defunct since 264e56d8 ("mm: disable user
interface to manually rescue unevictable pages"), which was in 2011, and
there haven't been any reports of usecases for it, only reports that the
deprecation warnings are annying.  It's unlikely that anybody is using
this interface specifically at this point, so remove it.

Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f606b77f

Documentation/ABI/stable/sysfs-devices-node

+0 −8
Original line number Diff line number Diff line
@@ -85,14 +85,6 @@ Description: 
		will be compacted. When it completes, memory will be freed

		into blocks which have as many contiguous pages as possible



What:		/sys/devices/system/node/nodeX/scan_unevictable_pages

Date:		October 2008

Contact:	Lee Schermerhorn <lee.schermerhorn@hp.com>

Description:

		When set, it triggers scanning the node's unevictable lists

		and move any pages that have become evictable onto the respective

		zone's inactive list. See mm/vmscan.c



What:		/sys/devices/system/node/nodeX/hugepages/hugepages-<size>/

Date:		December 2009

Contact:	Lee Schermerhorn <lee.schermerhorn@hp.com>

drivers/base/node.c

+0 −3
Original line number Diff line number Diff line
@@ -289,8 +289,6 @@ static int register_node(struct node *node, int num, struct node *parent) 
		device_create_file(&node->dev, &dev_attr_distance);

		device_create_file(&node->dev, &dev_attr_vmstat);



		scan_unevictable_register_node(node);



		hugetlb_register_node(node);



		compaction_register_node(node);
@@ -314,7 +312,6 @@ void unregister_node(struct node *node) 
	device_remove_file(&node->dev, &dev_attr_distance);

	device_remove_file(&node->dev, &dev_attr_vmstat);



	scan_unevictable_unregister_node(node);

	hugetlb_unregister_node(node);		/* no-op, if memoryless node */



	device_unregister(&node->dev);

include/linux/swap.h

+0 −16
Original line number Diff line number Diff line
@@ -354,22 +354,6 @@ static inline int zone_reclaim(struct zone *z, gfp_t mask, unsigned int order) 
extern int page_evictable(struct page *page);

extern void check_move_unevictable_pages(struct page **, int nr_pages);



extern unsigned long scan_unevictable_pages;

extern int scan_unevictable_handler(struct ctl_table *, int,

					void __user *, size_t *, loff_t *);

#ifdef CONFIG_NUMA

extern int scan_unevictable_register_node(struct node *node);

extern void scan_unevictable_unregister_node(struct node *node);

#else

static inline int scan_unevictable_register_node(struct node *node)

{

	return 0;

}

static inline void scan_unevictable_unregister_node(struct node *node)

{

}

#endif



extern int kswapd_run(int nid);

extern void kswapd_stop(int nid);

#ifdef CONFIG_MEMCG

kernel/sysctl.c

+0 −7
Original line number Diff line number Diff line
@@ -1460,13 +1460,6 @@ static struct ctl_table vm_table[] = { 
		.extra2		= &one,

	},

#endif

	{

		.procname	= "scan_unevictable_pages",

		.data		= &scan_unevictable_pages,

		.maxlen		= sizeof(scan_unevictable_pages),

		.mode		= 0644,

		.proc_handler	= scan_unevictable_handler,

	},

#ifdef CONFIG_MEMORY_FAILURE

	{

		.procname	= "memory_failure_early_kill",

mm/vmscan.c

+0 −63
Original line number Diff line number Diff line
@@ -3797,66 +3797,3 @@ void check_move_unevictable_pages(struct page **pages, int nr_pages) 
	}

}

#endif /* CONFIG_SHMEM */
 


static void warn_scan_unevictable_pages(void)

{

	printk_once(KERN_WARNING

		    "%s: The scan_unevictable_pages sysctl/node-interface has been "

		    "disabled for lack of a legitimate use case.  If you have "

		    "one, please send an email to linux-mm@kvack.org.\n",

		    current->comm);

}



/*

 * scan_unevictable_pages [vm] sysctl handler.  On demand re-scan of

 * all nodes' unevictable lists for evictable pages

 */

unsigned long scan_unevictable_pages;



int scan_unevictable_handler(struct ctl_table *table, int write,

			   void __user *buffer,

			   size_t *length, loff_t *ppos)

{

	warn_scan_unevictable_pages();

	proc_doulongvec_minmax(table, write, buffer, length, ppos);

	scan_unevictable_pages = 0;

	return 0;

}



#ifdef CONFIG_NUMA

/*

 * per node 'scan_unevictable_pages' attribute.  On demand re-scan of

 * a specified node's per zone unevictable lists for evictable pages.

 */



static ssize_t read_scan_unevictable_node(struct device *dev,

					  struct device_attribute *attr,

					  char *buf)

{

	warn_scan_unevictable_pages();

	return sprintf(buf, "0\n");	/* always zero; should fit... */

}



static ssize_t write_scan_unevictable_node(struct device *dev,

					   struct device_attribute *attr,

					const char *buf, size_t count)

{

	warn_scan_unevictable_pages();

	return 1;

}





static DEVICE_ATTR(scan_unevictable_pages, S_IRUGO | S_IWUSR,

			read_scan_unevictable_node,

			write_scan_unevictable_node);



int scan_unevictable_register_node(struct node *node)

{

	return device_create_file(&node->dev, &dev_attr_scan_unevictable_pages);

}



void scan_unevictable_unregister_node(struct node *node)

{

	device_remove_file(&node->dev, &dev_attr_scan_unevictable_pages);

}

#endif