diff options
| author | Ojaswin Mujoo <ojaswin@linux.ibm.com> | 2023-05-30 15:33:50 +0300 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2023-06-27 02:34:56 +0300 |
| commit | f52f3d2b9fbab73c776f4d3386393e9bbc83b87d (patch) | |
| tree | f31cade6f7a4268ab31a3c714c6f4b5dfcbf240b /fs/ext4/mballoc.h | |
| parent | 7e170922f06bf46effa7c57f6035fc463d6edc7e (diff) | |
| download | linux-f52f3d2b9fbab73c776f4d3386393e9bbc83b87d.tar.xz | |
ext4: Give symbolic names to mballoc criterias
mballoc criterias have historically been called by numbers
like CR0, CR1... however this makes it confusing to understand
what each criteria is about.
Change these criterias from numbers to symbolic names and add
relevant comments. While we are at it, also reformat and add some
comments to ext4_seq_mb_stats_show() for better readability.
Additionally, define CR_FAST which signifies the criteria
below which we can make quicker decisions like:
* quitting early if (free block < requested len)
* avoiding to scan free extents smaller than required len.
* avoiding to initialize buddy cache and work with existing cache
* limiting prefetches
Suggested-by: Jan Kara <jack@suse.cz>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://lore.kernel.org/r/a2dc6ec5aea5e5e68cf8e788c2a964ffead9c8b0.1685449706.git.ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/mballoc.h')
| -rw-r--r-- | fs/ext4/mballoc.h | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/ext4/mballoc.h b/fs/ext4/mballoc.h index bddc0335c261..df6b5e7c2274 100644 --- a/fs/ext4/mballoc.h +++ b/fs/ext4/mballoc.h @@ -86,11 +86,11 @@ #define MB_DEFAULT_LINEAR_SCAN_THRESHOLD 16 /* - * The maximum order upto which CR1.5 can trim a particular allocation request. - * Example, if we have an order 7 request and max trim order of 3, CR1.5 can - * trim this upto order 4. + * The maximum order upto which CR_BEST_AVAIL_LEN can trim a particular + * allocation request. Example, if we have an order 7 request and max trim order + * of 3, we can trim this request upto order 4. */ -#define MB_DEFAULT_CR1_5_TRIM_ORDER 3 +#define MB_DEFAULT_BEST_AVAIL_TRIM_ORDER 3 /* * Number of valid buddy orders |