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Date: Tue, 9 Jun 2009 01:40:37 +0530
From: "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>
To: Nick Dokos <nicholas.dokos@...com>
Cc: "Theodore Ts'o" <tytso@....edu>,
Valerie Aurora <vaurora@...hat.com>, linux-ext4@...r.kernel.org
Subject: Re: Some 64-bit tests
Can you try this patch ?
commit 6a910bd1d28be09ba3a0e073bae78285ce057a5f
Author: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
Date: Tue Jun 9 01:38:53 2009 +0530
ext4: Use different normalization method for allocation size.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@...ux.vnet.ibm.com>
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index ed8482e..7f2423b 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -633,7 +633,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));
- border = 2 << sb->s_blocksize_bits;
+ border = 1 << (sb->s_blocksize_bits + 1);
while (len > 0) {
/* find how many blocks can be covered since this position */
@@ -3063,8 +3063,10 @@ static void ext4_mb_normalize_group_request(struct ext4_allocation_context *ac)
ext4_mb_normalize_request(struct ext4_allocation_context *ac,
struct ext4_allocation_request *ar)
{
- int bsbits, max;
+ int bsbits, i;
+ loff_t max;
ext4_lblk_t end;
+ unsigned int s_mb_stream_request;
loff_t size, orig_size, start_off;
ext4_lblk_t start, orig_start;
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
@@ -3090,54 +3092,52 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
}
bsbits = ac->ac_sb->s_blocksize_bits;
+ s_mb_stream_request = EXT4_SB(ac->ac_sb)->s_mb_stream_request;
+ /* make sure this is power of 2 */
+ s_mb_stream_request =
+ roundup_pow_of_two((unsigned long)s_mb_stream_request);
/* first, let's learn actual file size
* given current request is allocated */
size = ac->ac_o_ex.fe_logical + ac->ac_o_ex.fe_len;
- size = size << bsbits;
- if (size < i_size_read(ac->ac_inode))
- size = i_size_read(ac->ac_inode);
-
- /* max size of free chunks */
- max = 2 << bsbits;
+ if (size < (i_size_read(ac->ac_inode) >> bsbits))
+ size = i_size_read(ac->ac_inode) >> bsbits;
+ /*
+ * max free chunk blocks.
+ * (max buddy cache order is (bsbits + 1).
+ */
+ max = 1 << (bsbits + 1);
#define NRL_CHECK_SIZE(req, size, max, chunk_size) \
- (req <= (size) || max <= (chunk_size))
+ (((req <= (size)) && (req <= (chunk_size))) || max <= (chunk_size))
/* first, try to predict filesize */
/* XXX: should this table be tunable? */
start_off = 0;
- if (size <= 16 * 1024) {
- size = 16 * 1024;
- } else if (size <= 32 * 1024) {
- size = 32 * 1024;
- } else if (size <= 64 * 1024) {
- size = 64 * 1024;
- } else if (size <= 128 * 1024) {
- size = 128 * 1024;
- } else if (size <= 256 * 1024) {
- size = 256 * 1024;
- } else if (size <= 512 * 1024) {
- size = 512 * 1024;
- } else if (size <= 1024 * 1024) {
- size = 1024 * 1024;
- } else if (NRL_CHECK_SIZE(size, 4 * 1024 * 1024, max, 2 * 1024)) {
- start_off = ((loff_t)ac->ac_o_ex.fe_logical >>
- (21 - bsbits)) << 21;
- size = 2 * 1024 * 1024;
- } else if (NRL_CHECK_SIZE(size, 8 * 1024 * 1024, max, 4 * 1024)) {
- start_off = ((loff_t)ac->ac_o_ex.fe_logical >>
- (22 - bsbits)) << 22;
- size = 4 * 1024 * 1024;
- } else if (NRL_CHECK_SIZE(ac->ac_o_ex.fe_len,
- (8<<20)>>bsbits, max, 8 * 1024)) {
- start_off = ((loff_t)ac->ac_o_ex.fe_logical >>
- (23 - bsbits)) << 23;
- size = 8 * 1024 * 1024;
- } else {
- start_off = (loff_t)ac->ac_o_ex.fe_logical << bsbits;
- size = ac->ac_o_ex.fe_len << bsbits;
+
+ /*
+ * less than s_mb_stream_request is using locality group
+ * preallocation
+ */
+ if (size <= s_mb_stream_request)
+ size = s_mb_stream_request;
+ i = 4;
+ while (1) {
+ /*
+ * if (size <= 4 * s_mb_stream ||
+ * max <= 2 * s_mb_stream ) size = 2 * s_mb_stream
+ */
+ if (NRL_CHECK_SIZE(size, i * s_mb_stream_request,
+ max, ((i * s_mb_stream_request) >> 1))) {
+ /* number of blocks */
+ size = (i * s_mb_stream_request) >> 1;
+ size = size << bsbits;
+ start_off = (loff_t)ac->ac_o_ex.fe_logical & ~(size - 1);
+ break;
+ }
+ i = i << 1;
}
+
orig_size = size = size >> bsbits;
orig_start = start = start_off >> bsbits;
--
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