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f2fs: support passing down write hints given by users to block layer

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Add the 'whint_mode' mount option that controls which write
hints are passed down to block layer. There are "off" and
"user-based" mode. The default mode is "off".

1) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.

2) whint_mode=user-based. F2FS tries to pass down hints given
by users.

User                  F2FS                     Block
----                  ----                     -----
                      META                     WRITE_LIFE_NOT_SET
                      HOT_NODE                 "
                      WARM_NODE                "
                      COLD_NODE                "
ioctl(COLD)           COLD_DATA                WRITE_LIFE_EXTREME
extension list        "                        "

-- buffered io
WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
WRITE_LIFE_NONE       "                        "
WRITE_LIFE_MEDIUM     "                        "
WRITE_LIFE_LONG       "                        "

-- direct io
WRITE_LIFE_EXTREME    COLD_DATA                WRITE_LIFE_EXTREME
WRITE_LIFE_SHORT      HOT_DATA                 WRITE_LIFE_SHORT
WRITE_LIFE_NOT_SET    WARM_DATA                WRITE_LIFE_NOT_SET
WRITE_LIFE_NONE       "                        WRITE_LIFE_NONE
WRITE_LIFE_MEDIUM     "                        WRITE_LIFE_MEDIUM
WRITE_LIFE_LONG       "                        WRITE_LIFE_LONG

Many thanks to Chao Yu and Jaegeuk Kim for comments to
implement this patch.

Signed-off-by: Hyunchul Lee <cheol.lee@lge.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
[Jaegeuk Kim: avoid build warning]
[Chao Yu: fix to restore whint_mode in ->remount_fs]
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Hyunchul Lee
2018-01-31 11:36:57 +09:00
committed by Jaegeuk Kim
parent cd36d7a17f
commit 0cdd319539
4 changed files with 119 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
fs/f2fs/segment.c
View File

@@ -2456,6 +2456,62 @@ int rw_hint_to_seg_type(enum rw_hint hint)
}
}
/* This returns write hints for each segment type. This hints will be
* passed down to block layer. There are mapping tables which depend on
* the mount option 'whint_mode'.
*
* 1) whint_mode=off. F2FS only passes down WRITE_LIFE_NOT_SET.
*
* 2) whint_mode=user-based. F2FS tries to pass down hints given by users.
*
* User F2FS Block
* ---- ---- -----
* META WRITE_LIFE_NOT_SET
* HOT_NODE "
* WARM_NODE "
* COLD_NODE "
* ioctl(COLD) COLD_DATA WRITE_LIFE_EXTREME
* extension list " "
*
* -- buffered io
* WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
* WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
* WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
* WRITE_LIFE_NONE " "
* WRITE_LIFE_MEDIUM " "
* WRITE_LIFE_LONG " "
*
* -- direct io
* WRITE_LIFE_EXTREME COLD_DATA WRITE_LIFE_EXTREME
* WRITE_LIFE_SHORT HOT_DATA WRITE_LIFE_SHORT
* WRITE_LIFE_NOT_SET WARM_DATA WRITE_LIFE_NOT_SET
* WRITE_LIFE_NONE " WRITE_LIFE_NONE
* WRITE_LIFE_MEDIUM " WRITE_LIFE_MEDIUM
* WRITE_LIFE_LONG " WRITE_LIFE_LONG
*
*/
enum rw_hint io_type_to_rw_hint(struct f2fs_sb_info *sbi,
enum page_type type, enum temp_type temp)
{
if (sbi->whint_mode == WHINT_MODE_USER) {
if (type == DATA) {
switch (temp) {
case COLD:
return WRITE_LIFE_EXTREME;
case HOT:
return WRITE_LIFE_SHORT;
default:
return WRITE_LIFE_NOT_SET;
}
} else {
return WRITE_LIFE_NOT_SET;
}
} else {
return WRITE_LIFE_NOT_SET;
}
}
static int __get_segment_type_2(struct f2fs_io_info *fio)
{
if (fio->type == DATA)
@@ -2643,6 +2699,7 @@ void write_meta_page(struct f2fs_sb_info *sbi, struct page *page,
struct f2fs_io_info fio = {
.sbi = sbi,
.type = META,
.temp = HOT,
.op = REQ_OP_WRITE,
.op_flags = REQ_SYNC | REQ_META | REQ_PRIO,
.old_blkaddr = page->index,
@@ -2691,6 +2748,8 @@ int rewrite_data_page(struct f2fs_io_info *fio)
int err;
fio->new_blkaddr = fio->old_blkaddr;
/* i/o temperature is needed for passing down write hints */
__get_segment_type(fio);
stat_inc_inplace_blocks(fio->sbi);
err = f2fs_submit_page_bio(fio);