[XFS] Add a debug flag for allocations which are known to be larger than

one page.

SGI-PV: 955302
SGI-Modid: xfs-linux-melb:xfs-kern:26800a
Signed-off-by: NNathan Scott <nathans@sgi.com>
Signed-off-by: NTim Shimmin <tes@sgi.com>

fs/xfs/linux-2.6/kmem.c

@@ -34,6 +34,14 @@ kmem_alloc(size_t size, unsigned int __nocast flags)
 	gfp_t	lflags = kmem_flags_convert(flags);
 	void	*ptr;
 
+#ifdef DEBUG
+	if (unlikely(!(flags & KM_LARGE) && (size > PAGE_SIZE))) {
+		printk(KERN_WARNING "Large %s attempt, size=%ld\n",
+			__FUNCTION__, (long)size);
+		dump_stack();
+	}
+#endif
+
 	do {
 		if (size < MAX_SLAB_SIZE || retries > MAX_VMALLOCS)
 			ptr = kmalloc(size, lflags);

fs/xfs/linux-2.6/kmem.h

@@ -30,6 +30,7 @@
 #define KM_NOSLEEP	0x0002u
 #define KM_NOFS		0x0004u
 #define KM_MAYFAIL	0x0008u
+#define KM_LARGE	0x0010u
 
 /*
  * We use a special process flag to avoid recursive callbacks into
@@ -41,7 +42,7 @@ kmem_flags_convert(unsigned int __nocast flags)
 {
 	gfp_t	lflags;
 
-	BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL));
+	BUG_ON(flags & ~(KM_SLEEP|KM_NOSLEEP|KM_NOFS|KM_MAYFAIL|KM_LARGE));
 
 	if (flags & KM_NOSLEEP) {
 		lflags = GFP_ATOMIC | __GFP_NOWARN;

fs/xfs/linux-2.6/xfs_buf.c

@@ -768,7 +768,7 @@ xfs_buf_get_noaddr(
 	_xfs_buf_initialize(bp, target, 0, len, 0);
 
  try_again:
-	data = kmem_alloc(malloc_len, KM_SLEEP | KM_MAYFAIL);
+	data = kmem_alloc(malloc_len, KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 	if (unlikely(data == NULL))
 		goto fail_free_buf;
 

fs/xfs/quota/xfs_qm.c

@@ -112,17 +112,17 @@ xfs_Gqm_init(void)
 {
 	xfs_dqhash_t	*udqhash, *gdqhash;
 	xfs_qm_t	*xqm;
-	uint		i, hsize, flags = KM_SLEEP | KM_MAYFAIL;
+	uint		i, hsize, flags = KM_SLEEP | KM_MAYFAIL | KM_LARGE;
 
 	/*
 	 * Initialize the dquot hash tables.
 	 */
 	hsize = XFS_QM_HASHSIZE_HIGH;
-	while (!(udqhash = kmem_zalloc(hsize * sizeof(xfs_dqhash_t), flags))) {
+	while (!(udqhash = kmem_zalloc(hsize * sizeof(*udqhash), flags))) {
 		if ((hsize >>= 1) <= XFS_QM_HASHSIZE_LOW)
 			flags = KM_SLEEP;
 	}
-	gdqhash = kmem_zalloc(hsize * sizeof(xfs_dqhash_t), KM_SLEEP);
+	gdqhash = kmem_zalloc(hsize * sizeof(*gdqhash), KM_SLEEP | KM_LARGE);
 	ndquot = hsize << 8;
 
 	xqm = kmem_zalloc(sizeof(xfs_qm_t), KM_SLEEP);

fs/xfs/support/ktrace.c

@@ -75,7 +75,7 @@ ktrace_alloc(int nentries, unsigned int __nocast sleep)
 							    sleep);
 	} else {
 		ktep = (ktrace_entry_t*)kmem_zalloc((nentries * sizeof(*ktep)),
-							    sleep);
+							    sleep | KM_LARGE);
 	}
 
 	if (ktep == NULL) {

fs/xfs/xfs_iget.c

@@ -50,7 +50,7 @@ void
 xfs_ihash_init(xfs_mount_t *mp)
 {
 	__uint64_t	icount;
-	uint		i, flags = KM_SLEEP | KM_MAYFAIL;
+	uint		i, flags = KM_SLEEP | KM_MAYFAIL | KM_LARGE;
 
 	if (!mp->m_ihsize) {
 		icount = mp->m_maxicount ? mp->m_maxicount :
@@ -95,7 +95,7 @@ xfs_chash_init(xfs_mount_t *mp)
 	mp->m_chsize = min_t(uint, mp->m_chsize, mp->m_ihsize);
 	mp->m_chash = (xfs_chash_t *)kmem_zalloc(mp->m_chsize
 						 * sizeof(xfs_chash_t),
-						 KM_SLEEP);
+						 KM_SLEEP | KM_LARGE);
 	for (i = 0; i < mp->m_chsize; i++) {
 		spinlock_init(&mp->m_chash[i].ch_lock,"xfshash");
 	}

fs/xfs/xfs_log.c

@@ -1196,7 +1196,7 @@ xlog_alloc_log(xfs_mount_t	*mp,
 			  kmem_zalloc(sizeof(xlog_in_core_t), KM_SLEEP);
 		iclog = *iclogp;
 		iclog->hic_data = (xlog_in_core_2_t *)
-			  kmem_zalloc(iclogsize, KM_SLEEP);
+			  kmem_zalloc(iclogsize, KM_SLEEP | KM_LARGE);
 
 		iclog->ic_prev = prev_iclog;
 		prev_iclog = iclog;