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From: Andiry Xu <jix024@eng.ucsd.edu>
To: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-nvdimm@lists.01.org
Cc: dan.j.williams@intel.com, andy.rudoff@intel.com,
	coughlan@redhat.com, swanson@cs.ucsd.edu, david@fromorbit.com,
	jack@suse.com, swhiteho@redhat.com, miklos@szeredi.hu,
	andiry.xu@gmail.com, Andiry Xu <jix024@cs.ucsd.edu>
Subject: [RFC v2 20/83] Pmem block allocation routines.
Date: Sat, 10 Mar 2018 10:18:01 -0800
Message-ID: <1520705944-6723-21-git-send-email-jix024@eng.ucsd.edu> (raw)
In-Reply-To: <1520705944-6723-1-git-send-email-jix024@eng.ucsd.edu>

From: Andiry Xu <jix024@cs.ucsd.edu>

Upon a allocation request, NOVA first try the free list on current CPU.
If there are not enough blocks to allocate, NOVA will go to the
free list with the most free blocks.
Caller can specify allocation direction: from low address or from
high address.

Signed-off-by: Andiry Xu <jix024@cs.ucsd.edu>
---
 fs/nova/balloc.c | 270 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/nova/balloc.h |  10 +++
 2 files changed, 280 insertions(+)

diff --git a/fs/nova/balloc.c b/fs/nova/balloc.c
index 9108721..8e99215 100644
--- a/fs/nova/balloc.c
+++ b/fs/nova/balloc.c
@@ -441,6 +441,276 @@ int nova_free_log_blocks(struct super_block *sb,
 	return ret;
 }
 
+static int not_enough_blocks(struct free_list *free_list,
+	unsigned long num_blocks, enum alloc_type atype)
+{
+	struct nova_range_node *first = free_list->first_node;
+	struct nova_range_node *last = free_list->last_node;
+
+	if (free_list->num_free_blocks < num_blocks || !first || !last) {
+		nova_dbgv("%s: num_free_blocks=%ld; num_blocks=%ld; first=0x%p; last=0x%p",
+			  __func__, free_list->num_free_blocks, num_blocks,
+			  first, last);
+		return 1;
+	}
+
+	return 0;
+}
+
+/* Return how many blocks allocated */
+static long nova_alloc_blocks_in_free_list(struct super_block *sb,
+	struct free_list *free_list, unsigned short btype,
+	enum alloc_type atype, unsigned long num_blocks,
+	unsigned long *new_blocknr, enum nova_alloc_direction from_tail)
+{
+	struct rb_root *tree;
+	struct nova_range_node *curr, *next = NULL, *prev = NULL;
+	struct rb_node *temp, *next_node, *prev_node;
+	unsigned long curr_blocks;
+	bool found = 0;
+	unsigned long step = 0;
+
+	if (!free_list->first_node || free_list->num_free_blocks == 0) {
+		nova_dbgv("%s: Can't alloc. free_list->first_node=0x%p free_list->num_free_blocks = %lu",
+			  __func__, free_list->first_node,
+			  free_list->num_free_blocks);
+		return -ENOSPC;
+	}
+
+	if (atype == LOG && not_enough_blocks(free_list, num_blocks, atype)) {
+		nova_dbgv("%s: Can't alloc.  not_enough_blocks() == true",
+			  __func__);
+		return -ENOSPC;
+	}
+
+	tree = &(free_list->block_free_tree);
+	if (from_tail == ALLOC_FROM_HEAD)
+		temp = &(free_list->first_node->node);
+	else
+		temp = &(free_list->last_node->node);
+
+	while (temp) {
+		step++;
+		curr = container_of(temp, struct nova_range_node, node);
+
+		curr_blocks = curr->range_high - curr->range_low + 1;
+
+		if (num_blocks >= curr_blocks) {
+			/* Superpage allocation must succeed */
+			if (btype > 0 && num_blocks > curr_blocks)
+				goto next;
+
+			/* Otherwise, allocate the whole blocknode */
+			if (curr == free_list->first_node) {
+				next_node = rb_next(temp);
+				if (next_node)
+					next = container_of(next_node,
+						struct nova_range_node, node);
+				free_list->first_node = next;
+			}
+
+			if (curr == free_list->last_node) {
+				prev_node = rb_prev(temp);
+				if (prev_node)
+					prev = container_of(prev_node,
+						struct nova_range_node, node);
+				free_list->last_node = prev;
+			}
+
+			rb_erase(&curr->node, tree);
+			free_list->num_blocknode--;
+			num_blocks = curr_blocks;
+			*new_blocknr = curr->range_low;
+			nova_free_blocknode(sb, curr);
+			found = 1;
+			break;
+		}
+
+		/* Allocate partial blocknode */
+		if (from_tail == ALLOC_FROM_HEAD) {
+			*new_blocknr = curr->range_low;
+			curr->range_low += num_blocks;
+		} else {
+			*new_blocknr = curr->range_high + 1 - num_blocks;
+			curr->range_high -= num_blocks;
+		}
+
+		found = 1;
+		break;
+next:
+		if (from_tail == ALLOC_FROM_HEAD)
+			temp = rb_next(temp);
+		else
+			temp = rb_prev(temp);
+	}
+
+	if (free_list->num_free_blocks < num_blocks) {
+		nova_dbg("%s: free list %d has %lu free blocks, but allocated %lu blocks?\n",
+				__func__, free_list->index,
+				free_list->num_free_blocks, num_blocks);
+		return -ENOSPC;
+	}
+
+	if (found == 1)
+		free_list->num_free_blocks -= num_blocks;
+	else {
+		nova_dbgv("%s: Can't alloc.  found = %d", __func__, found);
+		return -ENOSPC;
+	}
+
+	NOVA_STATS_ADD(alloc_steps, step);
+
+	return num_blocks;
+}
+
+/* Find out the free list with most free blocks */
+static int nova_get_candidate_free_list(struct super_block *sb)
+{
+	struct nova_sb_info *sbi = NOVA_SB(sb);
+	struct free_list *free_list;
+	int cpuid = 0;
+	int num_free_blocks = 0;
+	int i;
+
+	for (i = 0; i < sbi->cpus; i++) {
+		free_list = nova_get_free_list(sb, i);
+		if (free_list->num_free_blocks > num_free_blocks) {
+			cpuid = i;
+			num_free_blocks = free_list->num_free_blocks;
+		}
+	}
+
+	return cpuid;
+}
+
+static int nova_new_blocks(struct super_block *sb, unsigned long *blocknr,
+	unsigned int num, unsigned short btype, int zero,
+	enum alloc_type atype, int cpuid, enum nova_alloc_direction from_tail)
+{
+	struct free_list *free_list;
+	void *bp;
+	unsigned long num_blocks = 0;
+	unsigned long new_blocknr = 0;
+	long ret_blocks = 0;
+	int retried = 0;
+	timing_t alloc_time;
+
+	num_blocks = num * nova_get_numblocks(btype);
+	if (num_blocks == 0) {
+		nova_dbg_verbose("%s: num_blocks == 0", __func__);
+		return -EINVAL;
+	}
+
+	NOVA_START_TIMING(new_blocks_t, alloc_time);
+	if (cpuid == ANY_CPU)
+		cpuid = smp_processor_id();
+
+retry:
+	free_list = nova_get_free_list(sb, cpuid);
+	spin_lock(&free_list->s_lock);
+
+	if (not_enough_blocks(free_list, num_blocks, atype)) {
+		nova_dbgv("%s: cpu %d, free_blocks %lu, required %lu, blocknode %lu\n",
+			  __func__, cpuid, free_list->num_free_blocks,
+			  num_blocks, free_list->num_blocknode);
+
+		if (retried >= 2)
+			/* Allocate anyway */
+			goto alloc;
+
+		spin_unlock(&free_list->s_lock);
+		cpuid = nova_get_candidate_free_list(sb);
+		retried++;
+		goto retry;
+	}
+alloc:
+	ret_blocks = nova_alloc_blocks_in_free_list(sb, free_list, btype, atype,
+					num_blocks, &new_blocknr, from_tail);
+
+	if (ret_blocks > 0) {
+		if (atype == LOG) {
+			free_list->alloc_log_count++;
+			free_list->alloc_log_pages += ret_blocks;
+		} else if (atype == DATA) {
+			free_list->alloc_data_count++;
+			free_list->alloc_data_pages += ret_blocks;
+		}
+	}
+
+	spin_unlock(&free_list->s_lock);
+	NOVA_END_TIMING(new_blocks_t, alloc_time);
+
+	if (ret_blocks <= 0 || new_blocknr == 0) {
+		nova_dbg_verbose("%s: not able to allocate %d blocks.  ret_blocks=%ld; new_blocknr=%lu",
+				 __func__, num, ret_blocks, new_blocknr);
+		return -ENOSPC;
+	}
+
+	if (zero) {
+		bp = nova_get_block(sb, nova_get_block_off(sb,
+						new_blocknr, btype));
+		memset_nt(bp, 0, PAGE_SIZE * ret_blocks);
+	}
+	*blocknr = new_blocknr;
+
+	nova_dbg_verbose("Alloc %lu NVMM blocks 0x%lx\n", ret_blocks, *blocknr);
+	return ret_blocks / nova_get_numblocks(btype);
+}
+
+// Allocate data blocks.  The offset for the allocated block comes back in
+// blocknr.  Return the number of blocks allocated.
+inline int nova_new_data_blocks(struct super_block *sb,
+	struct nova_inode_info_header *sih, unsigned long *blocknr,
+	unsigned long start_blk, unsigned int num,
+	enum nova_alloc_init zero, int cpu,
+	enum nova_alloc_direction from_tail)
+{
+	int allocated;
+	timing_t alloc_time;
+
+	NOVA_START_TIMING(new_data_blocks_t, alloc_time);
+	allocated = nova_new_blocks(sb, blocknr, num,
+			    sih->i_blk_type, zero, DATA, cpu, from_tail);
+	NOVA_END_TIMING(new_data_blocks_t, alloc_time);
+	if (allocated < 0) {
+		nova_dbgv("FAILED: Inode %lu, start blk %lu, alloc %d data blocks from %lu to %lu\n",
+			  sih->ino, start_blk, allocated, *blocknr,
+			  *blocknr + allocated - 1);
+	} else {
+		nova_dbgv("Inode %lu, start blk %lu, alloc %d data blocks from %lu to %lu\n",
+			  sih->ino, start_blk, allocated, *blocknr,
+			  *blocknr + allocated - 1);
+	}
+	return allocated;
+}
+
+
+// Allocate log blocks. The offset for the allocated block comes back in
+// blocknr.  Return the number of blocks allocated.
+inline int nova_new_log_blocks(struct super_block *sb,
+			struct nova_inode_info_header *sih,
+			unsigned long *blocknr, unsigned int num,
+			enum nova_alloc_init zero, int cpu,
+			enum nova_alloc_direction from_tail)
+{
+	int allocated;
+	timing_t alloc_time;
+
+	NOVA_START_TIMING(new_log_blocks_t, alloc_time);
+	allocated = nova_new_blocks(sb, blocknr, num,
+			    sih->i_blk_type, zero, LOG, cpu, from_tail);
+	NOVA_END_TIMING(new_log_blocks_t, alloc_time);
+	if (allocated < 0) {
+		nova_dbgv("%s: ino %lu, failed to alloc %d log blocks",
+			  __func__, sih->ino, num);
+	} else {
+		nova_dbgv("%s: ino %lu, alloc %d of %d log blocks %lu to %lu\n",
+			  __func__, sih->ino, allocated, num, *blocknr,
+			  *blocknr + allocated - 1);
+	}
+	return allocated;
+}
+
 /* We do not take locks so it's inaccurate */
 unsigned long nova_count_free_blocks(struct super_block *sb)
 {
diff --git a/fs/nova/balloc.h b/fs/nova/balloc.h
index 249eb72..463fbac 100644
--- a/fs/nova/balloc.h
+++ b/fs/nova/balloc.h
@@ -73,6 +73,16 @@ extern int nova_free_data_blocks(struct super_block *sb,
 	struct nova_inode_info_header *sih, unsigned long blocknr, int num);
 extern int nova_free_log_blocks(struct super_block *sb,
 	struct nova_inode_info_header *sih, unsigned long blocknr, int num);
+extern inline int nova_new_data_blocks(struct super_block *sb,
+	struct nova_inode_info_header *sih, unsigned long *blocknr,
+	unsigned long start_blk, unsigned int num,
+	enum nova_alloc_init zero, int cpu,
+	enum nova_alloc_direction from_tail);
+extern int nova_new_log_blocks(struct super_block *sb,
+	struct nova_inode_info_header *sih,
+	unsigned long *blocknr, unsigned int num,
+	enum nova_alloc_init zero, int cpu,
+	enum nova_alloc_direction from_tail);
 int nova_find_free_slot(struct nova_sb_info *sbi,
 	struct rb_root *tree, unsigned long range_low,
 	unsigned long range_high, struct nova_range_node **prev,
-- 
2.7.4

  parent reply index

Thread overview: 119+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-10 18:17 [RFC v2 00/83] NOVA: a new file system for persistent memory Andiry Xu
2018-03-10 18:17 ` [RFC v2 01/83] Introduction and documentation of NOVA filesystem Andiry Xu
2018-03-19 20:43   ` Randy Dunlap
2018-03-19 23:00     ` Andiry Xu
2018-04-22  8:05   ` Pavel Machek
2018-03-10 18:17 ` [RFC v2 02/83] Add nova_def.h Andiry Xu
2018-03-10 18:17 ` [RFC v2 03/83] Add super.h Andiry Xu
2018-03-15  4:54   ` Darrick J. Wong
2018-03-15  6:11     ` Andiry Xu
2018-03-15  9:05       ` Arnd Bergmann
2018-03-15 17:51         ` Andiry Xu
2018-03-15 20:04           ` Andreas Dilger
2018-03-15 20:38           ` Arnd Bergmann
2018-03-16  2:59             ` Theodore Y. Ts'o
2018-03-16  6:17               ` Andiry Xu
2018-03-16  6:30                 ` Darrick J. Wong
2018-03-16  9:19               ` Arnd Bergmann
2018-03-10 18:17 ` [RFC v2 04/83] NOVA inode definition Andiry Xu
2018-03-15  5:06   ` Darrick J. Wong
2018-03-15  6:16     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 05/83] Add NOVA filesystem definitions and useful helper routines Andiry Xu
2018-03-11 12:00   ` Nikolay Borisov
2018-03-11 19:22     ` Eric Biggers
2018-03-11 21:45       ` Andiry Xu
2018-03-19 19:39       ` Andiry Xu
2018-03-19 20:30         ` Eric Biggers
2018-03-19 21:59           ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 06/83] Add inode get/read methods Andiry Xu
2018-04-23  6:12   ` Darrick J. Wong
2018-04-23 15:55     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 07/83] Initialize inode_info and rebuild inode information in nova_iget() Andiry Xu
2018-03-10 18:17 ` [RFC v2 08/83] NOVA superblock operations Andiry Xu
2018-03-10 18:17 ` [RFC v2 09/83] Add Kconfig and Makefile Andiry Xu
2018-03-11 12:15   ` Nikolay Borisov
2018-03-11 21:32     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 10/83] Add superblock integrity check Andiry Xu
2018-03-10 18:17 ` [RFC v2 11/83] Add timing and I/O statistics for performance analysis and profiling Andiry Xu
2018-03-10 18:17 ` [RFC v2 12/83] Add timing for mount and init Andiry Xu
2018-03-10 18:17 ` [RFC v2 13/83] Add remount_fs and show_options methods Andiry Xu
2018-03-10 18:17 ` [RFC v2 14/83] Add range node kmem cache Andiry Xu
2018-03-11 11:55   ` Nikolay Borisov
2018-03-11 21:31     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 15/83] Add free list data structure Andiry Xu
2018-03-10 18:17 ` [RFC v2 16/83] Initialize block map and free lists in nova_init() Andiry Xu
2018-03-11 12:12   ` Nikolay Borisov
2018-03-11 21:30     ` Andiry Xu
2018-03-10 18:17 ` [RFC v2 17/83] Add statfs support Andiry Xu
2018-03-10 18:17 ` [RFC v2 18/83] Add freelist statistics printing Andiry Xu
2018-03-10 18:18 ` [RFC v2 19/83] Add pmem block free routines Andiry Xu
2018-03-10 18:18 ` Andiry Xu [this message]
2018-03-10 18:18 ` [RFC v2 21/83] Add log structure Andiry Xu
2018-03-10 18:18 ` [RFC v2 22/83] Inode log pages allocation and reclaimation Andiry Xu
2018-03-10 18:18 ` [RFC v2 23/83] Save allocator to pmem in put_super Andiry Xu
2018-03-10 18:18 ` [RFC v2 24/83] Initialize and allocate inode table Andiry Xu
2018-03-10 18:18 ` [RFC v2 25/83] Support get normal inode address and inode table extentsion Andiry Xu
2018-03-10 18:18 ` [RFC v2 26/83] Add inode_map to track inuse inodes Andiry Xu
2018-03-10 18:18 ` [RFC v2 27/83] Save the inode inuse list to pmem upon umount Andiry Xu
2018-03-10 18:18 ` [RFC v2 28/83] Add NOVA address space operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 29/83] Add write_inode and dirty_inode routines Andiry Xu
2018-03-10 18:18 ` [RFC v2 30/83] New NOVA inode allocation Andiry Xu
2018-03-10 18:18 ` [RFC v2 31/83] Add new vfs " Andiry Xu
2018-03-10 18:18 ` [RFC v2 32/83] Add log entry definitions Andiry Xu
2018-03-10 18:18 ` [RFC v2 33/83] Inode log and entry printing for debug purpose Andiry Xu
2018-03-10 18:18 ` [RFC v2 34/83] Journal: NOVA light weight journal definitions Andiry Xu
2018-03-10 18:18 ` [RFC v2 35/83] Journal: Lite journal helper routines Andiry Xu
2018-03-10 18:18 ` [RFC v2 36/83] Journal: Lite journal recovery Andiry Xu
2018-03-10 18:18 ` [RFC v2 37/83] Journal: Lite journal create and commit Andiry Xu
2018-03-10 18:18 ` [RFC v2 38/83] Journal: NOVA lite journal initialization Andiry Xu
2018-03-10 18:18 ` [RFC v2 39/83] Log operation: dentry append Andiry Xu
2018-03-10 18:18 ` [RFC v2 40/83] Log operation: file write entry append Andiry Xu
2018-03-10 18:18 ` [RFC v2 41/83] Log operation: setattr " Andiry Xu
2018-03-10 18:18 ` [RFC v2 42/83] Log operation: link change append Andiry Xu
2018-03-10 18:18 ` [RFC v2 43/83] Log operation: in-place update log entry Andiry Xu
2018-03-10 18:18 ` [RFC v2 44/83] Log operation: invalidate log entries Andiry Xu
2018-03-10 18:18 ` [RFC v2 45/83] Log operation: file inode log lookup and assign Andiry Xu
2018-03-10 18:18 ` [RFC v2 46/83] Dir: Add Directory radix tree insert/remove methods Andiry Xu
2018-03-10 18:18 ` [RFC v2 47/83] Dir: Add initial dentries when initializing a directory inode log Andiry Xu
2018-03-10 18:18 ` [RFC v2 48/83] Dir: Readdir operation Andiry Xu
2018-03-10 18:18 ` [RFC v2 49/83] Dir: Append create/remove dentry Andiry Xu
2018-03-10 18:18 ` [RFC v2 50/83] Inode: Add nova_evict_inode Andiry Xu
2018-03-10 18:18 ` [RFC v2 51/83] Rebuild: directory inode Andiry Xu
2018-03-10 18:18 ` [RFC v2 52/83] Rebuild: file inode Andiry Xu
2018-03-10 18:18 ` [RFC v2 53/83] Namei: lookup Andiry Xu
2018-03-10 18:18 ` [RFC v2 54/83] Namei: create and mknod Andiry Xu
2018-03-10 18:18 ` [RFC v2 55/83] Namei: mkdir Andiry Xu
2018-03-10 18:18 ` [RFC v2 56/83] Namei: link and unlink Andiry Xu
2018-03-10 18:18 ` [RFC v2 57/83] Namei: rmdir Andiry Xu
2018-03-10 18:18 ` [RFC v2 58/83] Namei: rename Andiry Xu
2018-03-10 18:18 ` [RFC v2 59/83] Namei: setattr Andiry Xu
2018-03-10 18:18 ` [RFC v2 60/83] Add special inode operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 61/83] Super: Add nova_export_ops Andiry Xu
2018-03-10 18:18 ` [RFC v2 62/83] File: getattr and file inode operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 63/83] File operation: llseek Andiry Xu
2018-03-10 18:18 ` [RFC v2 64/83] File operation: open, fsync, flush Andiry Xu
2018-03-10 18:18 ` [RFC v2 65/83] File operation: read Andiry Xu
2018-03-10 18:18 ` [RFC v2 66/83] Super: Add file write item cache Andiry Xu
2018-03-10 18:18 ` [RFC v2 67/83] Dax: commit list of file write items to log Andiry Xu
2018-03-10 18:18 ` [RFC v2 68/83] File operation: copy-on-write write Andiry Xu
2018-03-10 18:18 ` [RFC v2 69/83] Super: Add module param inplace_data_updates Andiry Xu
2018-03-10 18:18 ` [RFC v2 70/83] File operation: Inplace write Andiry Xu
2018-03-10 18:18 ` [RFC v2 71/83] Symlink support Andiry Xu
2018-03-10 18:18 ` [RFC v2 72/83] File operation: fallocate Andiry Xu
2018-03-10 18:18 ` [RFC v2 73/83] Dax: Add iomap operations Andiry Xu
2018-03-10 18:18 ` [RFC v2 74/83] File operation: Mmap Andiry Xu
2018-03-10 18:18 ` [RFC v2 75/83] File operation: read/write iter Andiry Xu
2018-03-10 18:18 ` [RFC v2 76/83] Ioctl support Andiry Xu
2018-03-10 18:18 ` [RFC v2 77/83] GC: Fast garbage collection Andiry Xu
2018-03-10 18:18 ` [RFC v2 78/83] GC: Thorough " Andiry Xu
2018-03-10 18:19 ` [RFC v2 79/83] Normal recovery Andiry Xu
2018-03-10 18:19 ` [RFC v2 80/83] Failure recovery: bitmap operations Andiry Xu
2018-03-10 18:19 ` [RFC v2 81/83] Failure recovery: Inode pages recovery routines Andiry Xu
2018-03-10 18:19 ` [RFC v2 82/83] Failure recovery: Per-CPU recovery Andiry Xu
2018-03-10 18:19 ` [RFC v2 83/83] Sysfs support Andiry Xu
2018-03-15  0:33   ` Randy Dunlap
2018-03-15  6:07     ` Andiry Xu
2018-03-22 15:00   ` David Sterba
2018-03-23  0:31     ` Andiry Xu
2018-03-11  2:14 ` [RFC v2 00/83] NOVA: a new file system for persistent memory Theodore Y. Ts'o
2018-03-11  4:58   ` Andiry Xu

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Linux-Fsdevel Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-fsdevel/0 linux-fsdevel/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-fsdevel linux-fsdevel/ https://lore.kernel.org/linux-fsdevel \
		linux-fsdevel@vger.kernel.org
	public-inbox-index linux-fsdevel

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-fsdevel


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git