/*
 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
 * Copyright (c) 2010 David Chinner.
 * Copyright (c) 2011 Christoph Hellwig.
 * 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
 */
#ifndef __XFS_EXTENT_BUSY_H__
#define	__XFS_EXTENT_BUSY_H__

struct xfs_mount;
struct xfs_trans;
struct xfs_alloc_arg;

/*
 * Busy block/extent entry.  Indexed by a rbtree in perag to mark blocks that
 * have been freed but whose transactions aren't committed to disk yet.
 *
 * Note that we use the transaction ID to record the transaction, not the
 * transaction structure itself. See xfs_extent_busy_insert() for details.
 */
struct xfs_extent_busy {
	struct rb_node	rb_node;	/* ag by-bno indexed search tree */
	struct list_head list;		/* transaction busy extent list */
	xfs_agnumber_t	agno;
	xfs_agblock_t	bno;
	xfs_extlen_t	length;
	unsigned int	flags;
#define XFS_EXTENT_BUSY_DISCARDED	0x01	/* undergoing a discard op. */
#define XFS_EXTENT_BUSY_SKIP_DISCARD	0x02	/* do not discard */
};

void
xfs_extent_busy_insert(struct xfs_trans *tp, xfs_agnumber_t agno,
	xfs_agblock_t bno, xfs_extlen_t len, unsigned int flags);

void
xfs_extent_busy_clear(struct xfs_mount *mp, struct list_head *list,
	bool do_discard);

int
xfs_extent_busy_search(struct xfs_mount *mp, xfs_agnumber_t agno,
	xfs_agblock_t bno, xfs_extlen_t len);

void
xfs_extent_busy_reuse(struct xfs_mount *mp, xfs_agnumber_t agno,
	xfs_agblock_t fbno, xfs_extlen_t flen, bool userdata);

void
xfs_extent_busy_trim(struct xfs_alloc_arg *args, xfs_agblock_t bno,
	xfs_extlen_t len, xfs_agblock_t *rbno, xfs_extlen_t *rlen);

int
xfs_extent_busy_ag_cmp(void *priv, struct list_head *a, struct list_head *b);

static inline void xfs_extent_busy_sort(struct list_head *list)
{
	list_sort(NULL, list, xfs_extent_busy_ag_cmp);
}

#endif /* __XFS_EXTENT_BUSY_H__ */
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<tr class='logheader'><td><span title='2017-01-31 13:28:06 -0500'>2017-01-31</span></td><td class='logsubject'><a href='/cgit.cgi/linux/net-next.git/commit/net/core/ethtool.c?id=4d1ceea8516cd6adf21f6b75995e2a7d4f376f9b'>net: ethtool: convert large order kmalloc allocations to vzalloc</a></td><td>Alexei Starovoitov</td><td>1</td><td><span class='deletions'>-17</span>/<span class='insertions'>+22</span></td></tr>
<tr class='nohover-highlight'><td/><td colspan='5' class='logmsg'>
under memory pressure 'ethtool -S' command may warn:
[ 2374.385195] ethtool: page allocation failure: order:4, mode:0x242c0c0
[ 2374.405573] CPU: 12 PID: 40211 Comm: ethtool Not tainted
[ 2374.423071] Call Trace:
[ 2374.423076]  [&lt;ffffffff8148cb29&gt;] dump_stack+0x4d/0x64
[ 2374.423080]  [&lt;ffffffff811667cb&gt;] warn_alloc_failed+0xeb/0x150
[ 2374.423082]  [&lt;ffffffff81169cd3&gt;] ? __alloc_pages_direct_compact+0x43/0xf0
[ 2374.423084]  [&lt;ffffffff8116a25c&gt;] __alloc_pages_nodemask+0x4dc/0xbf0
[ 2374.423091]  [&lt;ffffffffa0023dc2&gt;] ? cmd_exec+0x722/0xcd0 [mlx5_core]
[ 2374.423095]  [&lt;ffffffff811b3dcc&gt;] alloc_pages_current+0x8c/0x110
[ 2374.423097]  [&lt;ffffffff81168859&gt;] alloc_kmem_pages+0x19/0x90
[ 2374.423099]  [&lt;ffffffff81186e5e&gt;] kmalloc_order_trace+0x2e/0xe0
[ 2374.423101]  [&lt;ffffffff811c0084&gt;] __kmalloc+0x204/0x220
[ 2374.423105]  [&lt;ffffffff816c269e&gt;] dev_ethtool+0xe4e/0x1f80
[ 2374.423106]  [&lt;ffffffff816b967e&gt;] ? dev_get_by_name_rcu+0x5e/0x80
[ 2374.423108]  [&lt;ffffffff816d6926&gt;] dev_ioctl+0x156/0x560
[ 2374.423111]  [&lt;ffffffff811d4c68&gt;] ? mem_cgroup_commit_charge+0x78/0x3c0
[ 2374.423117]  [&lt;ffffffff8169d542&gt;] sock_do_ioctl+0x42/0x50
[ 2374.423119]  [&lt;ffffffff8169d9c3&gt;] sock_ioctl+0x1b3/0x250
[ 2374.423121]  [&lt;ffffffff811f0f42&gt;] do_vfs_ioctl+0x92/0x580
[ 2374.423123]  [&lt;ffffffff8100222b&gt;] ? do_audit_syscall_entry+0x4b/0x70
[ 2374.423124]  [&lt;ffffffff8100287c&gt;] ? syscall_trace_enter_phase1+0xfc/0x120
[ 2374.423126]  [&lt;ffffffff811f14a9&gt;] SyS_ioctl+0x79/0x90
[ 2374.423127]  [&lt;ffffffff81002bb0&gt;] do_syscall_64+0x50/0xa0
[ 2374.423129]  [&lt;ffffffff817e19bc&gt;] entry_SYSCALL64_slow_path+0x25/0x25

~1160 mlx5 counters ~= order 4 allocation which is unlikely to succeed
under memory pressure. Convert them to vzalloc() as ethtool_get_regs() does.
Also take care of drivers without counters similar to
commit 67ae7cf1eeda ("ethtool: Allow zero-length register dumps again")
and reduce warn_on to warn_on_once.

Signed-off-by: Alexei Starovoitov &lt;ast@kernel.org&gt;
Signed-off-by: David S. Miller &lt;davem@davemloft.net&gt;


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