Release 4.10 fs/xfs/kmem.c

/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include <linux/mm.h>
#include <linux/highmem.h>
#include <linux/slab.h>
#include <linux/swap.h>
#include <linux/blkdev.h>
#include <linux/backing-dev.h>
#include "kmem.h"
#include "xfs_message.h"

/*
 * Greedy allocation.  May fail and may return vmalloced memory.
 */

void *

kmem_zalloc_greedy(size_t *size, size_t minsize, size_t maxsize)
{
	void		*ptr;
	size_t		kmsize = maxsize;

	while (!(ptr = vzalloc(kmsize))) {
		if ((kmsize >>= 1) <= minsize)
			kmsize = minsize;
	}
	if (ptr)
		*size = kmsize;
	return ptr;
}

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christoph hellwig
christoph hellwig
64
98.46%
1
50.00%
dave chinner
dave chinner
1
1.54%
1
50.00%
Total
65
100.00%
2
100.00%


void *

kmem_alloc(size_t size, xfs_km_flags_t flags)
{
	int	retries = 0;
	gfp_t	lflags = kmem_flags_convert(flags);
	void	*ptr;

	do {
		ptr = kmalloc(size, lflags);
		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
			return ptr;
		if (!(++retries % 100))
			xfs_err(NULL,
	"%s(%u) possible memory allocation deadlock size %u in %s (mode:0x%x)",
				current->comm, current->pid,
				(unsigned int)size, __func__, lflags);
		congestion_wait(BLK_RW_ASYNC, HZ/50);
	} while (1);
}

Contributors
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CommitProp
nathan scott
nathan scott
84
78.50%
2
20.00%
tetsuo handa
tetsuo handa
8
7.48%
1
10.00%
eric sandeen
eric sandeen
7
6.54%
1
10.00%
dave chinner
dave chinner
3
2.80%
1
10.00%
al viro
al viro
2
1.87%
2
20.00%
andrew morton
andrew morton
1
0.93%
1
10.00%
harvey harrison
harvey harrison
1
0.93%
1
10.00%
jens axboe
jens axboe
1
0.93%
1
10.00%
Total
107
100.00%
10
100.00%


void *

kmem_zalloc_large(size_t size, xfs_km_flags_t flags)
{
	unsigned noio_flag = 0;
	void	*ptr;
	gfp_t	lflags;

	ptr = kmem_zalloc(size, flags | KM_MAYFAIL);
	if (ptr)
		return ptr;

	/*
         * __vmalloc() will allocate data pages and auxillary structures (e.g.
         * pagetables) with GFP_KERNEL, yet we may be under GFP_NOFS context
         * here. Hence we need to tell memory reclaim that we are in such a
         * context via PF_MEMALLOC_NOIO to prevent memory reclaim re-entering
         * the filesystem here and potentially deadlocking.
         */
	if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
		noio_flag = memalloc_noio_save();

	lflags = kmem_flags_convert(flags);
	ptr = __vmalloc(size, lflags | __GFP_HIGHMEM | __GFP_ZERO, PAGE_KERNEL);

	if ((current->flags & PF_FSTRANS) || (flags & KM_NOFS))
		memalloc_noio_restore(noio_flag);

	return ptr;
}

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dave chinner
dave chinner
108
98.18%
2
66.67%
nathan scott
nathan scott
2
1.82%
1
33.33%
Total
110
100.00%
3
100.00%


void *

kmem_realloc(const void *old, size_t newsize, xfs_km_flags_t flags)
{
	int	retries = 0;
	gfp_t	lflags = kmem_flags_convert(flags);
	void	*ptr;

	do {
		ptr = krealloc(old, newsize, lflags);
		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
			return ptr;
		if (!(++retries % 100))
			xfs_err(NULL,
	"%s(%u) possible memory allocation deadlock size %zu in %s (mode:0x%x)",
				current->comm, current->pid,
				newsize, __func__, lflags);
		congestion_wait(BLK_RW_ASYNC, HZ/50);
	} while (1);
}

Contributors
Person
Tokens
Prop
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CommitProp
christoph hellwig
christoph hellwig
68
61.82%
1
20.00%
nathan scott
nathan scott
39
35.45%
1
20.00%
al viro
al viro
1
0.91%
1
20.00%
barry naujok
barry naujok
1
0.91%
1
20.00%
dave chinner
dave chinner
1
0.91%
1
20.00%
Total
110
100.00%
5
100.00%


void *

kmem_zone_alloc(kmem_zone_t *zone, xfs_km_flags_t flags)
{
	int	retries = 0;
	gfp_t	lflags = kmem_flags_convert(flags);
	void	*ptr;

	do {
		ptr = kmem_cache_alloc(zone, lflags);
		if (ptr || (flags & (KM_MAYFAIL|KM_NOSLEEP)))
			return ptr;
		if (!(++retries % 100))
			xfs_err(NULL,
		"%s(%u) possible memory allocation deadlock in %s (mode:0x%x)",
				current->comm, current->pid,
				__func__, lflags);
		congestion_wait(BLK_RW_ASYNC, HZ/50);
	} while (1);
}
Contributors
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CommitProp
nathan scott
nathan scott
85
83.33%
2
22.22%
tetsuo handa
tetsuo handa
9
8.82%
1
11.11%
dave chinner
dave chinner
3
2.94%
1
11.11%
al viro
al viro
2
1.96%
2
22.22%
jens axboe
jens axboe
1
0.98%
1
11.11%
andrew morton
andrew morton
1
0.98%
1
11.11%
harvey harrison
harvey harrison
1
0.98%
1
11.11%
Total
102
100.00%
9
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
nathan scott
nathan scott
226
43.46%
4
22.22%
christoph hellwig
christoph hellwig
132
25.38%
2
11.11%
dave chinner
dave chinner
120
23.08%
3
16.67%
tetsuo handa
tetsuo handa
17
3.27%
1
5.56%
eric sandeen
eric sandeen
7
1.35%
1
5.56%
al viro
al viro
5
0.96%
2
11.11%
andrew morton
andrew morton
5
0.96%
1
5.56%
tejun heo
tejun heo
3
0.58%
1
5.56%
jens axboe
jens axboe
2
0.38%
1
5.56%
harvey harrison
harvey harrison
2
0.38%
1
5.56%
barry naujok
barry naujok
1
0.19%
1
5.56%
Total
520
100.00%
18
100.00%
Directory: fs/xfs

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