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Ojaswin Mujoo 3c65b7309d ext4: make mb_optimize_scan performance mount option work with extents 
commit 077d0c2c78 upstream.

Currently mb_optimize_scan scan feature which improves filesystem
performance heavily (when FS is fragmented), seems to be not working
with files with extents (ext4 by default has files with extents).

This patch fixes that and makes mb_optimize_scan feature work
for files with extents.

Below are some performance numbers obtained when allocating a 10M and 100M
file with and w/o this patch on a filesytem with no 1M contiguous block.

<perf numbers>
===============
Workload: dd if=/dev/urandom of=test conv=fsync bs=1M count=10/100

Time taken
=====================================================
no.     Size   without-patch     with-patch    Diff(%)
1       10M      0m8.401s         0m5.623s     33.06%
2       100M     1m40.465s        1m14.737s    25.6%

<debug stats>
=============
w/o patch:
  mballoc:
    reqs: 17056
    success: 11407
    groups_scanned: 13643
    cr0_stats:
            hits: 37
            groups_considered: 9472
            useless_loops: 36
            bad_suggestions: 0
    cr1_stats:
            hits: 11418
            groups_considered: 908560
            useless_loops: 1894
            bad_suggestions: 0
    cr2_stats:
            hits: 1873
            groups_considered: 6913
            useless_loops: 21
    cr3_stats:
            hits: 21
            groups_considered: 5040
            useless_loops: 21
    extents_scanned: 417364
            goal_hits: 3707
            2^n_hits: 37
            breaks: 1873
            lost: 0
    buddies_generated: 239/240
    buddies_time_used: 651080
    preallocated: 705
    discarded: 478

with patch:
  mballoc:
    reqs: 12768
    success: 11305
    groups_scanned: 12768
    cr0_stats:
            hits: 1
            groups_considered: 18
            useless_loops: 0
            bad_suggestions: 0
    cr1_stats:
            hits: 5829
            groups_considered: 50626
            useless_loops: 0
            bad_suggestions: 0
    cr2_stats:
            hits: 6938
            groups_considered: 580363
            useless_loops: 0
    cr3_stats:
            hits: 0
            groups_considered: 0
            useless_loops: 0
    extents_scanned: 309059
            goal_hits: 0
            2^n_hits: 1
            breaks: 1463
            lost: 0
    buddies_generated: 239/240
    buddies_time_used: 791392
    preallocated: 673
    discarded: 446

Fixes: 196e402 (ext4: improve cr 0 / cr 1 group scanning)
Cc: stable@kernel.org
Reported-by: Geetika Moolchandani <Geetika.Moolchandani1@ibm.com>
Reported-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
Suggested-by: Ritesh Harjani <riteshh@linux.ibm.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://lore.kernel.org/r/fc9a48f7f8dcfc83891a8b21f6dd8cdf056ed810.1646732698.git.ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2022-04-08 14:22:59 +02:00
..
.kunitconfig ext4: add .kunitconfig fragment to enable ext4-specific tests 2021-02-11 23:16:30 -05:00
acl.c vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
acl.h vfs: add rcu argument to ->get_acl() callback 2021-08-18 22:08:24 +02:00
balloc.c ext4: flush background discard kwork when retry allocation 2021-08-30 23:35:53 -04:00
bitmap.c
block_validity.c ext4: standardize error message in ext4_protect_reserved_inode() 2020-12-17 13:30:55 -05:00
dir.c ext4: fix potential infinite loop in ext4_dx_readdir() 2021-10-01 00:05:09 -04:00
ext4.h ext4: fast commit may miss file actions 2022-03-08 19:12:32 +01:00
ext4_extents.h ext4: fix sparse warnings 2021-08-30 23:36:50 -04:00
ext4_jbd2.c ext4: fix null-ptr-deref in '__ext4_journal_ensure_credits' 2022-01-27 11:05:17 +01:00
ext4_jbd2.h ext4: Support for checksumming from journal triggers 2021-08-30 23:36:50 -04:00
extents.c ext4: fast commit may not fallback for ineligible commit 2022-03-08 19:12:32 +01:00
extents_status.c ext4: correct the cache_nr in tracepoint ext4_es_shrink_exit 2021-06-22 21:34:17 -04:00
extents_status.h ext4: fix extent_status trace points 2020-01-25 02:03:03 -05:00
fast_commit.c ext4: fast commit may miss file actions 2022-03-08 19:12:32 +01:00
fast_commit.h ext4: simplify updating of fast commit stats 2022-03-08 19:12:32 +01:00
file.c In addition to some ext4 bug fixes and cleanups, this cycle we add the 2021-09-02 09:37:09 -07:00
fsmap.c treewide: Change list_sort to use const pointers 2021-04-08 16:04:22 -07:00
fsmap.h ext4: fsmap: fix the block/inode bitmap comment 2021-06-24 09:48:29 -04:00
fsync.c block: use an on-stack bio in blkdev_issue_flush 2021-01-27 09:51:48 -07:00
hash.c ext4: handle casefolding with encryption 2021-04-05 22:04:20 -04:00
ialloc.c ext4: Support for checksumming from journal triggers 2021-08-30 23:36:50 -04:00
indirect.c ext4: Support for checksumming from journal triggers 2021-08-30 23:36:50 -04:00
inline.c ext4: fix fs corruption when tring to remove a non-empty directory with IO error 2022-04-08 14:22:59 +02:00
inode-test.c fs: ext4: Modify inode-test.c to use KUnit parameterized testing feature 2020-12-02 16:07:25 -07:00
inode.c ext4: fast commit may not fallback for ineligible commit 2022-03-08 19:12:32 +01:00
ioctl.c ext4: fast commit may not fallback for ineligible commit 2022-03-08 19:12:32 +01:00
Kconfig ext: EXT4_KUNIT_TESTS should depend on EXT4_FS instead of selecting it 2021-02-11 23:12:59 -05:00
Makefile ext4: Move orphan inode handling into a separate file 2021-08-30 23:36:51 -04:00
mballoc.c ext4: make mb_optimize_scan performance mount option work with extents 2022-04-08 14:22:59 +02:00
mballoc.h ext4: fix various seppling typos 2021-04-09 23:14:59 -04:00
migrate.c ext4: don't use the orphan list when migrating an inode 2022-01-27 11:05:18 +01:00
mmp.c ext4: fix potential uninitialized access to retval in kmmpd 2021-07-23 07:31:29 -04:00
move_extent.c ext4: use common helpers in all places reading metadata buffers 2020-10-18 10:37:14 -04:00
namei.c ext4: fix fs corruption when tring to remove a non-empty directory with IO error 2022-04-08 14:22:59 +02:00
orphan.c ext4: Improve scalability of ext4 orphan file handling 2021-08-30 23:36:51 -04:00
page-io.c block: rename BIO_MAX_PAGES to BIO_MAX_VECS 2021-03-11 07:47:48 -07:00
readpage.c block: Add bio_max_segs 2021-02-26 15:49:51 -07:00
resize.c ext4: Support for checksumming from journal triggers 2021-08-30 23:36:50 -04:00
super.c ext4: fast commit may miss file actions 2022-03-08 19:12:32 +01:00
symlink.c ext4: report correct st_size for encrypted symlinks 2021-07-25 20:01:06 -07:00
sysfs.c ext4: notify sysfs on errors_count value change 2021-06-29 21:06:02 -04:00
truncate.h ext4: Convert to use mapping->invalidate_lock 2021-07-13 14:29:00 +02:00
verity.c New features for ext4 this cycle include support for encrypted 2021-04-30 15:35:30 -07:00
xattr.c ext4: fast commit may not fallback for ineligible commit 2022-03-08 19:12:32 +01:00
xattr.h ext4: remove duplicate definition of ext4_xattr_ibody_inline_set() 2021-06-24 10:09:39 -04:00
xattr_hurd.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr_security.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr_trusted.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00
xattr_user.c acl: handle idmapped mounts 2021-01-24 14:27:17 +01:00