From: liuderong <liuderong@oppo.com>
When segs_per_sec is larger than 1, section may contain free segments,
mtime should be the mean value of each valid segments,
so introduce get_section_mtime to exclude free segments in a section.
Signed-off-by: liuderong <liuderong@oppo.com>
---
fs/f2fs/f2fs.h | 2 ++
fs/f2fs/gc.c | 15 ++-------------
fs/f2fs/segment.c | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
3 files changed, 48 insertions(+), 18 deletions(-)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4dcdcdd..d6adf0f 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -3762,6 +3762,8 @@ enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi);
unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
unsigned int segno);
+unsigned long long get_section_mtime(struct f2fs_sb_info *sbi,
+ unsigned int segno);
#define DEF_FRAGMENT_SIZE 4
#define MIN_FRAGMENT_SIZE 1
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 6299639..03c6117 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -332,20 +332,14 @@ static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
{
struct sit_info *sit_i = SIT_I(sbi);
- unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
- unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
unsigned long long mtime = 0;
unsigned int vblocks;
unsigned char age = 0;
unsigned char u;
- unsigned int i;
unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi);
- for (i = 0; i < usable_segs_per_sec; i++)
- mtime += get_seg_entry(sbi, start + i)->mtime;
+ mtime = get_section_mtime(sbi, segno);
vblocks = get_valid_blocks(sbi, segno, true);
-
- mtime = div_u64(mtime, usable_segs_per_sec);
vblocks = div_u64(vblocks, usable_segs_per_sec);
u = BLKS_TO_SEGS(sbi, vblocks * 100);
@@ -485,10 +479,7 @@ static void add_victim_entry(struct f2fs_sb_info *sbi,
struct victim_sel_policy *p, unsigned int segno)
{
struct sit_info *sit_i = SIT_I(sbi);
- unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
- unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
unsigned long long mtime = 0;
- unsigned int i;
if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
if (p->gc_mode == GC_AT &&
@@ -496,9 +487,7 @@ static void add_victim_entry(struct f2fs_sb_info *sbi,
return;
}
- for (i = 0; i < SEGS_PER_SEC(sbi); i++)
- mtime += get_seg_entry(sbi, start + i)->mtime;
- mtime = div_u64(mtime, SEGS_PER_SEC(sbi));
+ mtime = get_section_mtime(sbi, segno);
/* Handle if the system time has changed by the user */
if (mtime < sit_i->min_mtime)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 6627394..b63f35fa 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -5389,6 +5389,49 @@ unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi)
return SEGS_PER_SEC(sbi);
}
+unsigned long long get_section_mtime(struct f2fs_sb_info *sbi,
+ unsigned int segno)
+{
+ unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi);
+ unsigned int secno = 0, start = 0;
+ struct free_segmap_info *free_i = FREE_I(sbi);
+ unsigned int valid_seg_count = 0;
+ unsigned long long mtime = 0;
+ unsigned int i;
+
+ if (segno == NULL_SEGNO)
+ return 0;
+
+ secno = GET_SEC_FROM_SEG(sbi, segno);
+ start = GET_SEG_FROM_SEC(sbi, secno);
+
+ for (i = 0; i < usable_segs_per_sec; i++) {
+ /* for large section, only check the mtime of valid segments */
+ if (__is_large_section(sbi)) {
+ spin_lock(&free_i->segmap_lock);
+ if (test_bit(start + i, free_i->free_segmap)) {
+ mtime += get_seg_entry(sbi, start + i)->mtime;
+ valid_seg_count++;
+ }
+ spin_unlock(&free_i->segmap_lock);
+ } else {
+ mtime += get_seg_entry(sbi, start + i)->mtime;
+ }
+ }
+
+ if (__is_large_section(sbi)) {
+ if (!valid_seg_count)
+ goto out;
+ mtime = div_u64(mtime, valid_seg_count);
+ } else {
+ mtime = div_u64(mtime, usable_segs_per_sec);
+ }
+
+out:
+ return mtime;
+}
+
/*
* Update min, max modified time for cost-benefit GC algorithm
*/
@@ -5402,13 +5445,9 @@ static void init_min_max_mtime(struct f2fs_sb_info *sbi)
sit_i->min_mtime = ULLONG_MAX;
for (segno = 0; segno < MAIN_SEGS(sbi); segno += SEGS_PER_SEC(sbi)) {
- unsigned int i;
unsigned long long mtime = 0;
- for (i = 0; i < SEGS_PER_SEC(sbi); i++)
- mtime += get_seg_entry(sbi, segno + i)->mtime;
-
- mtime = div_u64(mtime, SEGS_PER_SEC(sbi));
+ mtime = get_section_mtime(sbi, segno);
if (sit_i->min_mtime > mtime)
sit_i->min_mtime = mtime;
--
2.7.4
________________________________
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This e-mail and its attachments contain confidential information from OPPO, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you are not the intended recipient, please do not read, copy, distribute, or use this information. If you have received this transmission in error, please notify the sender immediately by reply e-mail and then delete this message.
Electronic communications may contain computer viruses or other defects inherently, may not be accurately and/or timely transmitted to other systems, or may be intercepted, modified ,delayed, deleted or interfered. OPPO shall not be liable for any damages that arise or may arise from such matter and reserves all rights in connection with the email.
Unless expressly stated, this e-mail and its attachments are provided without any warranty, acceptance or promise of any kind in any country or region, nor constitute a formal confirmation or acceptance of any transaction or contract. The sender, together with its affiliates or any shareholder, director, officer, employee or any other person of any such institution (hereinafter referred to as "sender" or "OPPO") does not waive any rights and shall not be liable for any damages that arise or may arise from the intentional or negligent use of such information.
Cultural Differences Disclosure: Due to global cultural differences, any reply with only YES\OK or other simple words does not constitute any confirmation or acceptance of any transaction or contract, please confirm with the sender again to ensure clear opinion in written form. The sender shall not be responsible for any direct or indirect damages resulting from the intentional or misuse of such information.On 2024/9/11 10:40, liuderong@oppo.com wrote:
> From: liuderong <liuderong@oppo.com>
>
> When segs_per_sec is larger than 1, section may contain free segments,
> mtime should be the mean value of each valid segments,
> so introduce get_section_mtime to exclude free segments in a section.
>
> Signed-off-by: liuderong <liuderong@oppo.com>
> ---
> fs/f2fs/f2fs.h | 2 ++
> fs/f2fs/gc.c | 15 ++-------------
> fs/f2fs/segment.c | 49 ++++++++++++++++++++++++++++++++++++++++++++-----
> 3 files changed, 48 insertions(+), 18 deletions(-)
>
> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
> index 4dcdcdd..d6adf0f 100644
> --- a/fs/f2fs/f2fs.h
> +++ b/fs/f2fs/f2fs.h
> @@ -3762,6 +3762,8 @@ enum rw_hint f2fs_io_type_to_rw_hint(struct f2fs_sb_info *sbi,
> unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi);
> unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
> unsigned int segno);
> +unsigned long long get_section_mtime(struct f2fs_sb_info *sbi,
> + unsigned int segno);
>
> #define DEF_FRAGMENT_SIZE 4
> #define MIN_FRAGMENT_SIZE 1
> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
> index 6299639..03c6117 100644
> --- a/fs/f2fs/gc.c
> +++ b/fs/f2fs/gc.c
> @@ -332,20 +332,14 @@ static unsigned int check_bg_victims(struct f2fs_sb_info *sbi)
> static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned int segno)
> {
> struct sit_info *sit_i = SIT_I(sbi);
> - unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
> - unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
> unsigned long long mtime = 0;
> unsigned int vblocks;
> unsigned char age = 0;
> unsigned char u;
> - unsigned int i;
> unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi);
>
> - for (i = 0; i < usable_segs_per_sec; i++)
> - mtime += get_seg_entry(sbi, start + i)->mtime;
> + mtime = get_section_mtime(sbi, segno);
> vblocks = get_valid_blocks(sbi, segno, true);
> -
> - mtime = div_u64(mtime, usable_segs_per_sec);
> vblocks = div_u64(vblocks, usable_segs_per_sec);
>
> u = BLKS_TO_SEGS(sbi, vblocks * 100);
> @@ -485,10 +479,7 @@ static void add_victim_entry(struct f2fs_sb_info *sbi,
> struct victim_sel_policy *p, unsigned int segno)
> {
> struct sit_info *sit_i = SIT_I(sbi);
> - unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
> - unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
> unsigned long long mtime = 0;
> - unsigned int i;
>
> if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
> if (p->gc_mode == GC_AT &&
> @@ -496,9 +487,7 @@ static void add_victim_entry(struct f2fs_sb_info *sbi,
> return;
> }
>
> - for (i = 0; i < SEGS_PER_SEC(sbi); i++)
> - mtime += get_seg_entry(sbi, start + i)->mtime;
> - mtime = div_u64(mtime, SEGS_PER_SEC(sbi));
> + mtime = get_section_mtime(sbi, segno);
>
> /* Handle if the system time has changed by the user */
> if (mtime < sit_i->min_mtime)
> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
> index 6627394..b63f35fa 100644
> --- a/fs/f2fs/segment.c
> +++ b/fs/f2fs/segment.c
> @@ -5389,6 +5389,49 @@ unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi)
> return SEGS_PER_SEC(sbi);
> }
>
> +unsigned long long get_section_mtime(struct f2fs_sb_info *sbi,
> + unsigned int segno)
> +{
> + unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi);
> + unsigned int secno = 0, start = 0;
> + struct free_segmap_info *free_i = FREE_I(sbi);
> + unsigned int valid_seg_count = 0;
> + unsigned long long mtime = 0;
> + unsigned int i;
> +
> + if (segno == NULL_SEGNO)
> + return 0;
> +
> + secno = GET_SEC_FROM_SEG(sbi, segno);
> + start = GET_SEG_FROM_SEC(sbi, secno);
> +
> + for (i = 0; i < usable_segs_per_sec; i++) {
> + /* for large section, only check the mtime of valid segments */
> + if (__is_large_section(sbi)) {
> + spin_lock(&free_i->segmap_lock);
> + if (test_bit(start + i, free_i->free_segmap)) {
> + mtime += get_seg_entry(sbi, start + i)->mtime;
> + valid_seg_count++;
> + }
> + spin_unlock(&free_i->segmap_lock);
> + } else {
> + mtime += get_seg_entry(sbi, start + i)->mtime;
> + }
> + }
> +
> + if (__is_large_section(sbi)) {
> + if (!valid_seg_count)
> + goto out;
> + mtime = div_u64(mtime, valid_seg_count);
> + } else {
> + mtime = div_u64(mtime, usable_segs_per_sec);
> + }
What about:
if (!__is_large_section(sbi))
return get_seg_entry(sbi, start + i)->mtime;
for (i = 0; i < usable_segs_per_sec; i++) {
/* for large section, only check the mtime of valid segments */
...
}
return div_u64(mtime, usable_segs_per_sec);
Thanks,
> +
> +out:
> + return mtime;
> +}
> +
> /*
> * Update min, max modified time for cost-benefit GC algorithm
> */
> @@ -5402,13 +5445,9 @@ static void init_min_max_mtime(struct f2fs_sb_info *sbi)
> sit_i->min_mtime = ULLONG_MAX;
>
> for (segno = 0; segno < MAIN_SEGS(sbi); segno += SEGS_PER_SEC(sbi)) {
> - unsigned int i;
> unsigned long long mtime = 0;
>
> - for (i = 0; i < SEGS_PER_SEC(sbi); i++)
> - mtime += get_seg_entry(sbi, segno + i)->mtime;
> -
> - mtime = div_u64(mtime, SEGS_PER_SEC(sbi));
> + mtime = get_section_mtime(sbi, segno);
>
> if (sit_i->min_mtime > mtime)
> sit_i->min_mtime = mtime;
> --
> 2.7.4
On 2024/9/11 18:22, Chao Yu wrote:
> On 2024/9/11 10:40, liuderong@oppo.com wrote:
>> From: liuderong <liuderong@oppo.com>
>>
>> When segs_per_sec is larger than 1, section may contain free segments,
>> mtime should be the mean value of each valid segments,
>> so introduce get_section_mtime to exclude free segments in a section.
>>
>> Signed-off-by: liuderong <liuderong@oppo.com>
>> ---
>> fs/f2fs/f2fs.h | 2 ++
>> fs/f2fs/gc.c | 15 ++-------------
>> fs/f2fs/segment.c | 49
>> ++++++++++++++++++++++++++++++++++++++++++++-----
>> 3 files changed, 48 insertions(+), 18 deletions(-)
>>
>> diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
>> index 4dcdcdd..d6adf0f 100644
>> --- a/fs/f2fs/f2fs.h
>> +++ b/fs/f2fs/f2fs.h
>> @@ -3762,6 +3762,8 @@ enum rw_hint f2fs_io_type_to_rw_hint(struct
>> f2fs_sb_info *sbi,
>> unsigned int f2fs_usable_segs_in_sec(struct f2fs_sb_info *sbi);
>> unsigned int f2fs_usable_blks_in_seg(struct f2fs_sb_info *sbi,
>> unsigned int segno);
>> +unsigned long long get_section_mtime(struct f2fs_sb_info *sbi,
>> + unsigned int segno);
>>
>> #define DEF_FRAGMENT_SIZE 4
>> #define MIN_FRAGMENT_SIZE 1
>> diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
>> index 6299639..03c6117 100644
>> --- a/fs/f2fs/gc.c
>> +++ b/fs/f2fs/gc.c
>> @@ -332,20 +332,14 @@ static unsigned int check_bg_victims(struct
>> f2fs_sb_info *sbi)
>> static unsigned int get_cb_cost(struct f2fs_sb_info *sbi, unsigned
>> int segno)
>> {
>> struct sit_info *sit_i = SIT_I(sbi);
>> - unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
>> - unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
>> unsigned long long mtime = 0;
>> unsigned int vblocks;
>> unsigned char age = 0;
>> unsigned char u;
>> - unsigned int i;
>> unsigned int usable_segs_per_sec =
>> f2fs_usable_segs_in_sec(sbi);
>>
>> - for (i = 0; i < usable_segs_per_sec; i++)
>> - mtime += get_seg_entry(sbi, start + i)->mtime;
>> + mtime = get_section_mtime(sbi, segno);
>> vblocks = get_valid_blocks(sbi, segno, true);
>> -
>> - mtime = div_u64(mtime, usable_segs_per_sec);
>> vblocks = div_u64(vblocks, usable_segs_per_sec);
>>
>> u = BLKS_TO_SEGS(sbi, vblocks * 100);
>> @@ -485,10 +479,7 @@ static void add_victim_entry(struct f2fs_sb_info
>> *sbi,
>> struct victim_sel_policy *p,
>> unsigned int segno)
>> {
>> struct sit_info *sit_i = SIT_I(sbi);
>> - unsigned int secno = GET_SEC_FROM_SEG(sbi, segno);
>> - unsigned int start = GET_SEG_FROM_SEC(sbi, secno);
>> unsigned long long mtime = 0;
>> - unsigned int i;
>>
>> if (unlikely(is_sbi_flag_set(sbi, SBI_CP_DISABLED))) {
>> if (p->gc_mode == GC_AT &&
>> @@ -496,9 +487,7 @@ static void add_victim_entry(struct f2fs_sb_info
>> *sbi,
>> return;
>> }
>>
>> - for (i = 0; i < SEGS_PER_SEC(sbi); i++)
>> - mtime += get_seg_entry(sbi, start + i)->mtime;
>> - mtime = div_u64(mtime, SEGS_PER_SEC(sbi));
>> + mtime = get_section_mtime(sbi, segno);
>>
>> /* Handle if the system time has changed by the user */
>> if (mtime < sit_i->min_mtime)
>> diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
>> index 6627394..b63f35fa 100644
>> --- a/fs/f2fs/segment.c
>> +++ b/fs/f2fs/segment.c
>> @@ -5389,6 +5389,49 @@ unsigned int f2fs_usable_segs_in_sec(struct
>> f2fs_sb_info *sbi)
>> return SEGS_PER_SEC(sbi);
>> }
>>
>> +unsigned long long get_section_mtime(struct f2fs_sb_info *sbi,
>> + unsigned int segno)
>> +{
>> + unsigned int usable_segs_per_sec = f2fs_usable_segs_in_sec(sbi);
>> + unsigned int secno = 0, start = 0;
>> + struct free_segmap_info *free_i = FREE_I(sbi);
>> + unsigned int valid_seg_count = 0;
>> + unsigned long long mtime = 0;
>> + unsigned int i;
>> +
>> + if (segno == NULL_SEGNO)
>> + return 0;
>> +
>> + secno = GET_SEC_FROM_SEG(sbi, segno);
>> + start = GET_SEG_FROM_SEC(sbi, secno);
>> +
>> + for (i = 0; i < usable_segs_per_sec; i++) {
>> + /* for large section, only check the mtime of valid
>> segments */
>> + if (__is_large_section(sbi)) {
>> + spin_lock(&free_i->segmap_lock);
>> + if (test_bit(start + i, free_i->free_segmap)) {
>> + mtime += get_seg_entry(sbi, start +
>> i)->mtime;
>> + valid_seg_count++;
>> + }
>> + spin_unlock(&free_i->segmap_lock);
>> + } else {
>> + mtime += get_seg_entry(sbi, start + i)->mtime;
>> + }
>> + }
>> +
>> + if (__is_large_section(sbi)) {
>> + if (!valid_seg_count)
>> + goto out;
>> + mtime = div_u64(mtime, valid_seg_count);
>> + } else {
>> + mtime = div_u64(mtime, usable_segs_per_sec);
>> + }
>
> What about:
>
> if (!__is_large_section(sbi))
> return get_seg_entry(sbi, start + i)->mtime;
>
> for (i = 0; i < usable_segs_per_sec; i++) {
> /* for large section, only check the mtime of valid segments */
> ...
> }
>
> return div_u64(mtime, usable_segs_per_sec);
>
> Thanks,
>
OK, I will modify the code.
Thanks,
Derong
>> +
>> +out:
>> + return mtime;
>> +}
>> +
>> /*
>> * Update min, max modified time for cost-benefit GC algorithm
>> */
>> @@ -5402,13 +5445,9 @@ static void init_min_max_mtime(struct
>> f2fs_sb_info *sbi)
>> sit_i->min_mtime = ULLONG_MAX;
>>
>> for (segno = 0; segno < MAIN_SEGS(sbi); segno +=
>> SEGS_PER_SEC(sbi)) {
>> - unsigned int i;
>> unsigned long long mtime = 0;
>>
>> - for (i = 0; i < SEGS_PER_SEC(sbi); i++)
>> - mtime += get_seg_entry(sbi, segno + i)->mtime;
>> -
>> - mtime = div_u64(mtime, SEGS_PER_SEC(sbi));
>> + mtime = get_section_mtime(sbi, segno);
>>
>> if (sit_i->min_mtime > mtime)
>> sit_i->min_mtime = mtime;
>> --
>> 2.7.4
>
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