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Message-Id: <78D9631C-DFC8-451B-A59E-3E01D1BDCA01@dilger.ca>
Date: Tue, 19 Jan 2016 00:24:50 -0700
From: Andreas Dilger <adilger@...ger.ca>
To: Lokesh Jaliminche <lokesh.jaliminche@...il.com>
Cc: Theodore Ts'o <tytso@....edu>,
linux-ext4 <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH v6] EXT4: optimizing group search for inode allocation
> On Jan 18, 2016, at 11:08 PM, Lokesh Jaliminche <lokesh.jaliminche@...il.com> wrote:
>
> From: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
> Subject: [PATCH] ext4: optimizing group serch for inode allocation
>
> Added a check at the start of group search loop to
> avoid looping unecessarily in case of empty group.
> This also allow group search to jump directly to
> "found_flex_bg" with "stats" and "group" already set,
> so there is no need to go through the extra steps of
> setting "best_desc" , "best_group" and then break
> out of the loop just to set "stats" and "group" again.
>
> Signed-off-by: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
Thanks for sticking with the patch. This one looks good.
Reviewed-by: Andreas Dilger <adilger@...ger.ca>
> ---
> fs/ext4/ialloc.c | 10 ++++++++++
> 1 files changed, 10 insertions(+), 0 deletions(-)
>
> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
> index 1b8024d..3463d30 100644
> --- a/fs/ext4/ialloc.c
> +++ b/fs/ext4/ialloc.c
> @@ -477,6 +477,12 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
> (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
> int best_ndir = inodes_per_group;
> int ret = -1;
> + /* Maximum usable blocks per group as some blocks are used
> + * for inode tables and allocation bitmaps */
> + unsigned long long max_blocks_per_flex =
> + ((sbi->s_blocks_per_group -
> + (sbi->s_itb_per_group + 2)) *
> + flex_size) >> sbi->s_cluster_bits;
>
> if (qstr) {
> hinfo.hash_version = DX_HASH_HALF_MD4;
> @@ -489,6 +495,10 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
> for (i = 0; i < ngroups; i++) {
> g = (parent_group + i) % ngroups;
> get_orlov_stats(sb, g, flex_size, &stats);
> + /* can't get better group than empty group */
> + if (max_blocks_per_flex == stats.free_clusters &&
> + (inodes_per_group * flex_size) == stats.free_inodes)
> + goto found_flex_bg;
> if (!stats.free_inodes)
> continue;
> if (stats.used_dirs >= best_ndir)
> --
> 1.7.1
>
>
>
> On Mon, Jan 18, 2016 at 02:50:48PM -0700, Andreas Dilger wrote:
>> On Jan 16, 2016, at 4:02 PM, Lokesh Jaliminche <lokesh.jaliminche@...il.com> wrote:
>>>
>>> From: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
>>> Date: Thu, 7 Jan 2016 05:12:20 +0530
>>> Subject: [PATCH v5] ext4: optimizing group serch for inode allocation
>>>
>>> Added a check at the start of group search loop to
>>> avoid looping unecessarily in case of empty group.
>>> This also allow group search to jump directly to
>>> "found_flex_bg" with "stats" and "group" already set,
>>> so there is no need to go through the extra steps of
>>> setting "best_desc" , "best_group" and then break
>>> out of the loop just to set "stats" and "group" again.
>>
>> This looks very good, just one minor potential issue below.
>>
>>> Signed-off-by: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
>>> ---
>>> fs/ext4/ialloc.c | 10 ++++++++++
>>> 1 files changed, 10 insertions(+), 0 deletions(-)
>>>
>>> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
>>> index 1b8024d..d2835cc 100644
>>> --- a/fs/ext4/ialloc.c
>>> +++ b/fs/ext4/ialloc.c
>>> @@ -477,6 +477,12 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>> (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
>>> int best_ndir = inodes_per_group;
>>> int ret = -1;
>>> + /* Maximum usable blocks per group as some blocks are used
>>> + * for inode tables and allocation bitmaps */
>>> + unsigned int max_blocks_per_flex =
>>
>> This should be an unsigned long long or __u64, since the max_blocks_per_flex
>> calculation may overflow a 32-bit value on filesystems with larger block_size
>> and a large value for flex_size (larger than 2^13 for a 64KB blocksize).
>>
>> The "stats.free_clusters" is already a __u64 for this reason.
>>
>>> + ((sbi->s_blocks_per_group -
>>> + (sbi->s_itb_per_group + 2)) *
>>> + flex_size) >> sbi->s_cluster_bits;
>>>
>>> if (qstr) {
>>> hinfo.hash_version = DX_HASH_HALF_MD4;
>>> @@ -489,6 +495,10 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>> for (i = 0; i < ngroups; i++) {
>>> g = (parent_group + i) % ngroups;
>>> get_orlov_stats(sb, g, flex_size, &stats);
>>> + /* can't get better group than empty group */
>>> + if (max_blocks_per_flex == stats.free_clusters &&
>>> + (inodes_per_group * flex_size) == stats.free_inodes)
>>> + goto found_flex_bg;
>>> if (!stats.free_inodes)
>>> continue;
>>> if (stats.used_dirs >= best_ndir)
>>> --
>>> 1.7.1
>>>
>>>
>>>
>>> On Mon, Jan 11, 2016 at 02:13:46PM -0700, Andreas Dilger wrote:
>>>> On Jan 6, 2016, at 5:46 PM, Lokesh Jaliminche <lokesh.jaliminche@...il.com> wrote:
>>>>>
>>>>> you are right flex groups cannot be completely empty as some
>>>>> blocks are used for inode table and allocation bitmaps. I
>>>>> missed that point. I have corrected that. Also I have tested
>>>>> and validated this patch by putting some traces it works!
>>>>
>>>> Good news. Thanks for updating the patch and testing it.
>>>> More comments below.
>>>>
>>>>> Here are corresponding logs:
>>>>> commands:
>>>>> =========
>>>>> mkfs.ext4 -g 10000 -G 2 /dev/sdc
>>>>> mount -t ext4 /dev/sdc /mnt/test_ext4/
>>>>> cd /mnt/test_ext4
>>>>> mkdir 1
>>>>> cd 1
>>>>>
>>>>> logs:
>>>>> =====
>>>>> Jan 7 03:36:45 root kernel: [ 64.792939] max_usable_blocks_per_flex_group = [19692]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792939] stats.free_clusters = [19264]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792939] Inodes_per_flex_group = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792939] stats.free_inodes = [4853]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792950] max_usable_blocks_per_flex_group = [19692]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792950] stats.free_clusters = [19481]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792950] Inodes_per_flex_group = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792950] stats.free_inodes = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792958] max_usable_blocks_per_flex_group = [19692]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792958] stats.free_clusters = [19481]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792958] Inodes_per_flex_group = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792958] stats.free_inodes = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792965] max_usable_blocks_per_flex_group = [19692]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792965] stats.free_clusters = [19481]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792965] Inodes_per_flex_group = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792965] stats.free_inodes = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792972] max_usable_blocks_per_flex_group = [19692]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792972] stats.free_clusters = [19481]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792972] Inodes_per_flex_group = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792972] stats.free_inodes = [4864]
>>>>> Jan 7 03:36:45 root kernel: [ 64.792979] max_usable_blocks_per_flex_group = [19692]<<<<<<<<<<<
>>>>> Jan 7 03:36:45 root kernel: [ 64.792979] stats.free_clusters = [19692]<<<<<<<<<<<
>>>>> Jan 7 03:36:45 root kernel: [ 64.792979] Inodes_per_flex_group = [4864]<<<<<<<<<<<<
>>>>> Jan 7 03:36:45 root kernel: [ 64.792979] stats.free_inodes = [4864]<<<<<<<<<<<<
>>>>> Jan 7 03:36:45 root kernel: [ 64.792985] found_flex_bg >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>condition satisfied
>>>>>
>>>>>
>>>>> [Patch v4]:
>>>>> ==========
>>>>> From: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
>>>>> Date: Thu, 7 Jan 2016 05:12:20 +0530
>>>>> Subject: [PATCH] ext4: optimizing group serch for inode allocation
>>>>>
>>>>> Added a check at the start of group search loop to
>>>>> avoid looping unecessarily in case of empty group.
>>>>> This also allow group search to jump directly to
>>>>> "found_flex_bg" with "stats" and "group" already set,
>>>>> so there is no need to go through the extra steps of
>>>>> setting "best_desc" , "best_group" and then break
>>>>> out of the loop just to set "stats" and "group" again.
>>>>>
>>>>> Signed-off-by: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
>>>>> ---
>>>>> fs/ext4/ext4.h | 2 ++
>>>>> fs/ext4/ialloc.c | 21 +++++++++++++++++++--
>>>>> 2 files changed, 21 insertions(+), 2 deletions(-)
>>>>>
>>>>> diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
>>>>> index cc7ca4e..fc48f9a 100644
>>>>> --- a/fs/ext4/ext4.h
>>>>> +++ b/fs/ext4/ext4.h
>>>>> @@ -326,6 +326,8 @@ struct flex_groups {
>>>>> #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
>>>>> #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
>>>>> #ifdef __KERNEL__
>>>>> +# define EXT4_INODE_TABLE_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_itb_per_group)
>>>>> +# define EXT4_BLOCKS_PER_CLUSTER(s) (EXT4_SB(s)->s_cluster_ratio)
>>>>
>>>> I don't think there is much value to these macros. They aren't much
>>>> shorter than the actual variable access, and they don't provide any
>>>> improved clarity for the reader.
>>>>
>>>> I think they were introduced many years ago so that this header could
>>>> be shared between the kernel and e2fsprogs, but that is no longer true
>>>> so I don't think there is a need to add new ones.
>>>>
>>>> Ted, any opinion on this?
>>>>
>>>>> # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
>>>>> # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
>>>>> # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
>>>>> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
>>>>> index 1b8024d..dc66ad8 100644
>>>>> --- a/fs/ext4/ialloc.c
>>>>> +++ b/fs/ext4/ialloc.c
>>>>> @@ -463,7 +463,6 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>>>> sbi->s_log_groups_per_flex;
>>>>> parent_group >>= sbi->s_log_groups_per_flex;
>>>>> }
>>>>> -
>>>>> freei = percpu_counter_read_positive(&sbi->s_freeinodes_counter);
>>>>> avefreei = freei / ngroups;
>>>>
>>>> Not sure why this line is being deleted?
>>>>
>>>>> @@ -477,7 +476,20 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>>>> (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
>>>>> int best_ndir = inodes_per_group;
>>>>> int ret = -1;
>>>>> -
>>>>> + /* blocks used for inode table and allocation bitmaps */
>>>>> + unsigned int max_usable_blocks_per_flex_group;
>>>>
>>>> This could be shorter and still clear, like "max_blocks_per_flex".
>>>>
>>>>> + unsigned int blocks_per_group = EXT4_BLOCKS_PER_GROUP(sb);
>>>>> + unsigned int inode_table_blocks_per_group = \
>>>>> + EXT4_INODE_TABLE_BLOCKS_PER_GROUP(sb);
>>>>> + /* Number of blocks per cluster */
>>>>> + unsigned int cluster_ratio = EXT4_BLOCKS_PER_CLUSTER(sb);
>>>>
>>>> There also isn't much value to making local variables that hold these
>>>> same values again. It increases stack space for little benefit. They
>>>> are only accessed once anyway.
>>>>
>>>>> + unsigned int inodes_per_flex_group = inodes_per_group * \
>>>>> + flex_size;
>>>>> + max_usable_blocks_per_flex_group = \
>>>>> + ((blocks_per_group*flex_size) - \
>>>>
>>>> Spaces around that '*'.
>>>>
>>>>> + (inode_table_blocks_per_group * \
>>>>> + flex_size + 2 * flex_size)) / \
>>>>
>>>> This is C and not a CPP macro, so no need for linefeed escapes.
>>>>
>>>>> + cluster_ratio;
>>>>
>>>> This should be ">> EXT4_SB(sb)->s_cluster_bits" to avoid the divide.
>>>>
>>>>> if (qstr) {
>>>>> hinfo.hash_version = DX_HASH_HALF_MD4;
>>>>> hinfo.seed = sbi->s_hash_seed;
>>>>> @@ -489,6 +501,11 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>>>> for (i = 0; i < ngroups; i++) {
>>>>> g = (parent_group + i) % ngroups;
>>>>> get_orlov_stats(sb, g, flex_size, &stats);
>>>>> + /* can't get better group than empty group */
>>>>> + if (max_usable_blocks_per_flex_group == \
>>>>> + stats.free_clusters && \
>>>>
>>>> No need for linefeed escapes.
>>>>
>>>>> + inodes_per_flex_group == stats.free_inodes)
>>>>
>>>> Align continued line after '(' from the "if (" line.
>>>>
>>>>> + goto found_flex_bg;
>>>>
>>>> This is indented too much. It will work properly when you fix the
>>>> previous line.
>>>>
>>>>> if (!stats.free_inodes)
>>>>> continue;
>>>>> if (stats.used_dirs >= best_ndir)
>>>>> --
>>>>> 1.7.1
>>>>>
>>>>> Regards,
>>>>> Lokesh
>>>>>
>>>>> On Sun, Jan 03, 2016 at 11:34:51AM -0700, Andreas Dilger wrote:
>>>>>> On Dec 26, 2015, at 01:41, Lokesh Jaliminche <lokesh.jaliminche@...il.com> wrote:
>>>>>>>
>>>>>>>
>>>>>>> From 5199982d29ff291b181c25af63a22d6f2d6d3f7b Mon Sep 17 00:00:00 2001
>>>>>>> From: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
>>>>>>> Date: Sat, 26 Dec 2015 13:19:36 +0530
>>>>>>> Subject: [PATCH v3] ext4: optimizing group search for inode allocation
>>>>>>>
>>>>>>> Added a check at the start of group search loop to
>>>>>>> avoid looping unecessarily in case of empty group.
>>>>>>> This also allow group search to jump directly to
>>>>>>> "found_flex_bg" with "stats" and "group" already set,
>>>>>>> so there is no need to go through the extra steps of
>>>>>>> setting "best_desc" and "best_group" and then break
>>>>>>> out of the loop just to set "stats" and "group" again.
>>>>>>>
>>>>>>> Signed-off-by: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...il.com>
>>>>>>> ---
>>>>>>> fs/ext4/ialloc.c | 12 ++++++++++--
>>>>>>> 1 files changed, 10 insertions(+), 2 deletions(-)
>>>>>>>
>>>>>>> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
>>>>>>> index 1b8024d..16f94db 100644
>>>>>>> --- a/fs/ext4/ialloc.c
>>>>>>> +++ b/fs/ext4/ialloc.c
>>>>>>> @@ -473,10 +473,14 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>>>>>> ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
>>>>>>>
>>>>>>> if (S_ISDIR(mode) &&
>>>>>>> - ((parent == d_inode(sb->s_root)) ||
>>>>>>> - (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
>>>>>>> + ((parent == d_inode(sb->s_root)) ||
>>>>>>> + (ext4_test_inode_flag(parent, EXT4_INODE_TOPDIR)))) {
>>>>>>
>>>>>> I don't understand why you are changing the indentation here?
>>>>>>
>>>>>>> + unsigned int inodes_per_flex_group;
>>>>>>> + unsigned long int clusters_per_flex_group;
>>>>>>> int best_ndir = inodes_per_group;
>>>>>>> int ret = -1;
>>>>>>> + inodes_per_flex_group = inodes_per_group * flex_size;
>>>>>>> + clusters_per_flex_group = sbi->s_clusters_per_group * flex_size;
>>>>>>
>>>>>> Have you actually tested if this code works? When I was looking at this
>>>>>> code I was accidentally looking at the ext2 version, which only deals with
>>>>>> individual groups, and not flex groups. I don't think that a flex group
>>>>>> can actually be completely empty, since it will always contain at least
>>>>>> an inode table and some bitmaps.
>>>>>>
>>>>>> This calculation needs to take this into account or it will just be
>>>>>> overhead and not an optimization. Something like:
>>>>>>
>>>>>> /* account for inode table and allocation bitmaps */
>>>>>> clusters_per_flex_group = sbi->s_clusters_per_group * flex_size -
>>>>>> ((inodes_per_flex_group * EXT4_INODE_SIZE(sb) +
>>>>>> (flex_size << sb->s_blocksize_bits) * 2 ) >>
>>>>>> EXT4_SB(sb)->s_cluster_bits;
>>>>>>
>>>>>> It would be worthwhile to print this out and verify that there are actually
>>>>>> groups with this many free blocks in a newly formatted filesystem.
>>>>>>
>>>>>> Cheers, Andreas
>>>>>>
>>>>>>> if (qstr) {
>>>>>>> hinfo.hash_version = DX_HASH_HALF_MD4;
>>>>>>> @@ -489,6 +493,10 @@ static int find_group_orlov(struct super_block *sb, struct inode *parent,
>>>>>>> for (i = 0; i < ngroups; i++) {
>>>>>>> g = (parent_group + i) % ngroups;
>>>>>>> get_orlov_stats(sb, g, flex_size, &stats);
>>>>>>> + /* the group can't get any better than empty */
>>>>>>> + if (inodes_per_flex_group == stats.free_inodes &&
>>>>>>> + clusters_per_flex_group == stats.free_clusters)
>>>>>>> + goto found_flex_bg;
>>>>>>> if (!stats.free_inodes)
>>>>>>> continue;
>>>>>>> if (stats.used_dirs >= best_ndir)
>>>>>>> --
>>>>>>> 1.7.1
>>>>>>>
>>>>>>>
>>>>>>>> On Mon, Dec 21, 2015 at 10:27:37AM -0700, Andreas Dilger wrote:
>>>>>>>>> On Dec 18, 2015, at 4:32 PM, lokesh jaliminche <lokesh.jaliminche@...il.com> wrote:
>>>>>>>>>
>>>>>>>>> From 9e09fef78b2fa552c883bf8124af873abfde0805 Mon Sep 17 00:00:00 2001
>>>>>>>>> From: Lokesh Nagappa Jaliminche <lokesh.jaliminche@...gate.com>
>>>>>>>>
>>>>>>>> In the patch summary there is a typo - s/serch/search/
>>>>>>>>
>>>>>>>> Also, it appears your email client has mangled the whitespace in the
>>>>>>>> patch. Please use "git send-email" to send your patch to the list:
>>>>>>>>
>>>>>>>> git send-email --to tytso@....edu --cc linux-ext4@...r.kernel.org HEAD~1
>>>>>>>>
>>>>>>>> so that it arrives intact. You probably need to set it up in ~/.gitconfig:
>>>>>>>>
>>>>>>>> [sendemail]
>>>>>>>> confirm = compose
>>>>>>>> smtpdomain = {your client hostname}
>>>>>>>> smtpserver = {your SMTP server hostname}
>>>>>>>>
>>>>>>>> Cheers, Andreas
>>>>>>>>
>>>>>>>>> Added a check at the start of group search loop to
>>>>>>>>> avoid looping unecessarily in case of empty group.
>>>>>>>>> This also allow group search to jump directly to
>>>>>>>>> "found_flex_bg" with "stats" and "group" already set,
>>>>>>>>> so there is no need to go through the extra steps of
>>>>>>>>> setting "best_desc" and "best_group" and then break
>>>>>>>>> out of the loop just to set "stats" and "group" again.
>>>>>>>>>
>>>>>>>>> Signed-off-by: Lokesh N Jaliminche <lokesh.jaliminche@...il.com>
>>>>>>>>> ---
>>>>>>>>> fs/ext4/ialloc.c | 8 ++++++++
>>>>>>>>> 1 files changed, 8 insertions(+), 0 deletions(-)
>>>>>>>>>
>>>>>>>>> diff --git a/fs/ext4/ialloc.c b/fs/ext4/ialloc.c
>>>>>>>>> index 1b8024d..588bf8e 100644
>>>>>>>>> --- a/fs/ext4/ialloc.c
>>>>>>>>> +++ b/fs/ext4/ialloc.c
>>>>>>>>> @@ -446,6 +446,8 @@ static int find_group_orlov(struct super_block
>>>>>>>>> *sb, struct inode *parent,
>>>>>>>>> struct ext4_sb_info *sbi = EXT4_SB(sb);
>>>>>>>>> ext4_group_t real_ngroups = ext4_get_groups_count(sb);
>>>>>>>>> int inodes_per_group = EXT4_INODES_PER_GROUP(sb);
>>>>>>>>> + unsigned int inodes_per_flex_group;
>>>>>>>>> + long unsigned int blocks_per_clustre;
>>>>>>>>> unsigned int freei, avefreei, grp_free;
>>>>>>>>> ext4_fsblk_t freeb, avefreec;
>>>>>>>>> unsigned int ndirs;
>>>>>>>>> @@ -470,6 +472,8 @@ static int find_group_orlov(struct super_block
>>>>>>>>> *sb, struct inode *parent,
>>>>>>>>> percpu_counter_read_positive(&sbi->s_freeclusters_counter));
>>>>>>>>> avefreec = freeb;
>>>>>>>>> do_div(avefreec, ngroups);
>>>>>>>>> + inodes_per_flex_group = inodes_per_group * flex_size;
>>>>>>>>> + blocks_per_clustre = sbi->s_blocks_per_group * flex_size;
>>>>>>>>> ndirs = percpu_counter_read_positive(&sbi->s_dirs_counter);
>>>>>>>>>
>>>>>>>>> if (S_ISDIR(mode) &&
>>>>>>>>> @@ -489,6 +493,10 @@ static int find_group_orlov(struct super_block
>>>>>>>>> *sb, struct inode *parent,
>>>>>>>>> for (i = 0; i < ngroups; i++) {
>>>>>>>>> g = (parent_group + i) % ngroups;
>>>>>>>>> get_orlov_stats(sb, g, flex_size, &stats);
>>>>>>>>> + /* the group can't get any better than empty */
>>>>>>>>> + if (inodes_per_flex_group == stats.free_inodes &&
>>>>>>>>> + blocks_per_clustre == stats.free_clusters)
>>>>>>>>> + goto found_flex_bg;
>>>>>>>>> if (!stats.free_inodes)
>>>>>>>>> continue;
>>>>>>>>> if (stats.used_dirs >= best_ndir)
>>>>>>>>> --
>>>>>>>>> 1.7.1
>>>>>>>>> <0001-EXT4-optimizing-group-serch-for-inode-allocation.patch>
>>>>>>>>
>>>>>>>>
>>>>>>>> Cheers, Andreas
>>>>>>>
>>>>>>>
>>>>>>> <0001-ext4-optimizing-group-serch-for-inode-allocation.patch>
>>>>> <0001-ext4-optimizing-group-serch-for-inode-allocation.patch>
>>>>
>>>>
>>>> Cheers, Andreas
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>> <0001-ext4-optimizing-group-serch-for-inode-allocation.patch>
>>
>>
>> Cheers, Andreas
>>
>>
>>
>>
>>
>
>
> <0001-ext4-optimizing-group-serch-for-inode-allocation.patch>
Cheers, Andreas
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