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SubjectRe: [PATCH] f2fs: split bio cache
On 05/09, Chao Yu wrote:
> Hi Jaegeuk,
>
> On 2017/5/9 5:23, Jaegeuk Kim wrote:
> > Hi Chao,
> >
> > I can't see a strong reason to split meta from data/node and rename the existing
> > function names. Instead, how about keeping the existing one while adding some
> > page types to deal with log types?
>
> Hmm.. before write this patch, I have thought about this implementation which
> adds HOT_DATA/WARM_DATA/.. into page_type enum, but the final target is making
> different temperature log-header being with independent bio cache, io lock, and
> io list, eliminating interaction of different temperature IOs, also expanding
> f2fs' scalability when adding more log-headers. If we don't split meta from
> data/node, it's a little bit hard to approach this. What do you think?

I submitted clean-up patches. How about this on top of them?

---
fs/f2fs/data.c | 51 +++++++++++++++++++++++++++++++++------------
fs/f2fs/f2fs.h | 10 ++++++++-
fs/f2fs/gc.c | 2 ++
fs/f2fs/segment.c | 24 +++++++++++++++------
fs/f2fs/segment.h | 4 ++++
fs/f2fs/super.c | 21 ++++++++++++++++---
include/trace/events/f2fs.h | 14 ++++++++++++-
7 files changed, 102 insertions(+), 24 deletions(-)

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 06bb2042385e..49b7e3918484 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -282,21 +282,30 @@ static bool has_merged_page(struct f2fs_sb_info *sbi, struct inode *inode,
nid_t ino, pgoff_t idx, enum page_type type)
{
enum page_type btype = PAGE_TYPE_OF_BIO(type);
- struct f2fs_bio_info *io = &sbi->write_io[btype];
- bool ret;
+ enum temp_type temp;
+ struct f2fs_bio_info *io;
+ bool ret = false;

- down_read(&io->io_rwsem);
- ret = __has_merged_page(io, inode, ino, idx);
- up_read(&io->io_rwsem);
+ for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
+ io = sbi->write_io[btype] + temp;
+
+ down_read(&io->io_rwsem);
+ ret = __has_merged_page(io, inode, ino, idx);
+ up_read(&io->io_rwsem);
+
+ /* TODO: use HOT temp only for meta pages now. */
+ if (ret || btype == META)
+ break;
+ }
return ret;
}

static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
struct inode *inode, nid_t ino, pgoff_t idx,
- enum page_type type)
+ enum page_type type, enum temp_type temp)
{
enum page_type btype = PAGE_TYPE_OF_BIO(type);
- struct f2fs_bio_info *io = &sbi->write_io[btype];
+ struct f2fs_bio_info *io = sbi->write_io[btype] + temp;

down_write(&io->io_rwsem);

@@ -316,17 +325,34 @@ static void __f2fs_submit_merged_write(struct f2fs_sb_info *sbi,
up_write(&io->io_rwsem);
}

+static void __submit_merged_write_cond(struct f2fs_sb_info *sbi,
+ struct inode *inode, nid_t ino, pgoff_t idx,
+ enum page_type type, bool force)
+{
+ enum temp_type temp;
+
+ if (!force && !has_merged_page(sbi, inode, ino, idx, type))
+ return;
+
+ for (temp = HOT; temp < NR_TEMP_TYPE; temp++) {
+ __f2fs_submit_merged_write(sbi, inode, ino, idx, type, temp);
+
+ /* TODO: use HOT temp only for meta pages now. */
+ if (type >= META)
+ break;
+ }
+}
+
void f2fs_submit_merged_write(struct f2fs_sb_info *sbi, enum page_type type)
{
- __f2fs_submit_merged_write(sbi, NULL, 0, 0, type);
+ __submit_merged_write_cond(sbi, NULL, 0, 0, type, true);
}

void f2fs_submit_merged_write_cond(struct f2fs_sb_info *sbi,
struct inode *inode, nid_t ino, pgoff_t idx,
enum page_type type)
{
- if (has_merged_page(sbi, inode, ino, idx, type))
- __f2fs_submit_merged_write(sbi, inode, ino, idx, type);
+ __submit_merged_write_cond(sbi, inode, ino, idx, type, false);
}

void f2fs_flush_merged_writes(struct f2fs_sb_info *sbi)
@@ -369,7 +395,7 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
{
struct f2fs_sb_info *sbi = fio->sbi;
enum page_type btype = PAGE_TYPE_OF_BIO(fio->type);
- struct f2fs_bio_info *io = &sbi->write_io[btype];
+ struct f2fs_bio_info *io = sbi->write_io[btype] + fio->temp;
struct page *bio_page;
int err = 0;

@@ -405,8 +431,7 @@ int f2fs_submit_page_write(struct f2fs_io_info *fio)
io->fio = *fio;
}

- if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) <
- PAGE_SIZE) {
+ if (bio_add_page(io->bio, bio_page, PAGE_SIZE, 0) < PAGE_SIZE) {
__submit_merged_bio(io);
goto alloc_new;
}
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index bf837458cb18..90e97bc11972 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -792,9 +792,17 @@ enum page_type {
OPU,
};

+enum temp_type {
+ HOT = 0, /* must be zero for meta bio */
+ WARM,
+ COLD,
+ NR_TEMP_TYPE,
+};
+
struct f2fs_io_info {
struct f2fs_sb_info *sbi; /* f2fs_sb_info pointer */
enum page_type type; /* contains DATA/NODE/META/META_FLUSH */
+ enum temp_type temp; /* contains HOT/WARM/COLD */
int op; /* contains REQ_OP_ */
int op_flags; /* req_flag_bits */
block_t new_blkaddr; /* new block address to be written */
@@ -880,7 +888,7 @@ struct f2fs_sb_info {

/* for bio operations */
struct f2fs_bio_info read_io; /* for read bios */
- struct f2fs_bio_info write_io[NR_PAGE_TYPE]; /* for write bios */
+ struct f2fs_bio_info *write_io[NR_PAGE_TYPE]; /* for write bios */
struct mutex wio_mutex[NODE + 1]; /* bio ordering for NODE/DATA */
int write_io_size_bits; /* Write IO size bits */
mempool_t *write_io_dummy; /* Dummy pages */
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 67b87155bc48..e2b13558a915 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -586,6 +586,7 @@ static void move_encrypted_block(struct inode *inode, block_t bidx,
struct f2fs_io_info fio = {
.sbi = F2FS_I_SB(inode),
.type = DATA,
+ .temp = COLD,
.op = REQ_OP_READ,
.op_flags = 0,
.encrypted_page = NULL,
@@ -712,6 +713,7 @@ static void move_data_page(struct inode *inode, block_t bidx, int gc_type,
struct f2fs_io_info fio = {
.sbi = F2FS_I_SB(inode),
.type = DATA,
+ .temp = COLD,
.op = REQ_OP_WRITE,
.op_flags = REQ_SYNC,
.old_blkaddr = NULL_ADDR,
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index c9f3a2faee21..da4fd2c29e86 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2084,17 +2084,29 @@ static int __get_segment_type_6(struct f2fs_io_info *fio)

static int __get_segment_type(struct f2fs_io_info *fio)
{
+ int type;
+
switch (fio->sbi->active_logs) {
case 2:
- return __get_segment_type_2(fio);
+ type = __get_segment_type_2(fio);
+ break;
case 4:
- return __get_segment_type_4(fio);
+ type = __get_segment_type_4(fio);
+ break;
+ case 6:
+ type = __get_segment_type_6(fio);
+ break;
+ default:
+ f2fs_bug_on(fio->sbi, true);
}

- /* NR_CURSEG_TYPE(6) logs by default */
- f2fs_bug_on(fio->sbi, fio->sbi->active_logs != NR_CURSEG_TYPE);
-
- return __get_segment_type_6(fio);
+ if (IS_HOT(type))
+ fio->temp = HOT;
+ else if (IS_WARM(type))
+ fio->temp = WARM;
+ else
+ fio->temp = COLD;
+ return type;
}

void allocate_data_block(struct f2fs_sb_info *sbi, struct page *page,
diff --git a/fs/f2fs/segment.h b/fs/f2fs/segment.h
index 10bf05d4cff4..e9ba1f1d9723 100644
--- a/fs/f2fs/segment.h
+++ b/fs/f2fs/segment.h
@@ -27,6 +27,10 @@
#define IS_DATASEG(t) ((t) <= CURSEG_COLD_DATA)
#define IS_NODESEG(t) ((t) >= CURSEG_HOT_NODE)

+#define IS_HOT(t) ((t) == CURSEG_HOT_NODE || (t) == CURSEG_HOT_DATA)
+#define IS_WARM(t) ((t) == CURSEG_WARM_NODE || (t) == CURSEG_WARM_DATA)
+#define IS_COLD(t) ((t) == CURSEG_COLD_NODE || (t) == CURSEG_COLD_DATA)
+
#define IS_CURSEG(sbi, seg) \
(((seg) == CURSEG_I(sbi, CURSEG_HOT_DATA)->segno) || \
((seg) == CURSEG_I(sbi, CURSEG_WARM_DATA)->segno) || \
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 104a571a41c0..91599c9c3ef6 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -768,6 +768,7 @@ static void destroy_device_list(struct f2fs_sb_info *sbi)
static void f2fs_put_super(struct super_block *sb)
{
struct f2fs_sb_info *sbi = F2FS_SB(sb);
+ int i;

if (sbi->s_proc) {
remove_proc_entry("segment_info", sbi->s_proc);
@@ -838,6 +839,8 @@ static void f2fs_put_super(struct super_block *sb)
destroy_device_list(sbi);
mempool_destroy(sbi->write_io_dummy);
destroy_percpu_info(sbi);
+ for (i = 0; i < NR_PAGE_TYPE; i++)
+ kfree(sbi->write_io[i]);
kfree(sbi);
}

@@ -1954,9 +1957,19 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
sbi->read_io.sbi = sbi;
sbi->read_io.bio = NULL;
for (i = 0; i < NR_PAGE_TYPE; i++) {
- init_rwsem(&sbi->write_io[i].io_rwsem);
- sbi->write_io[i].sbi = sbi;
- sbi->write_io[i].bio = NULL;
+ int n = (i == META) ? 1: NR_TEMP_TYPE;
+ int j;
+
+ sbi->write_io[i] = kmalloc(n * sizeof(struct f2fs_bio_info),
+ GFP_KERNEL);
+ if (!sbi->write_io[i])
+ goto free_options;
+
+ for (j = HOT; j < n; j++) {
+ init_rwsem(&sbi->write_io[i][j].io_rwsem);
+ sbi->write_io[i][j].sbi = sbi;
+ sbi->write_io[i][j].bio = NULL;
+ }
}

init_rwsem(&sbi->cp_rwsem);
@@ -2202,6 +2215,8 @@ static int f2fs_fill_super(struct super_block *sb, void *data, int silent)
free_io_dummy:
mempool_destroy(sbi->write_io_dummy);
free_options:
+ for (i = 0; i < NR_PAGE_TYPE; i++)
+ kfree(sbi->write_io[i]);
destroy_percpu_info(sbi);
kfree(options);
free_sb_buf:
diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
index 5805d92893a8..6f77a2755abb 100644
--- a/include/trace/events/f2fs.h
+++ b/include/trace/events/f2fs.h
@@ -19,6 +19,9 @@ TRACE_DEFINE_ENUM(INMEM_INVALIDATE);
TRACE_DEFINE_ENUM(INMEM_REVOKE);
TRACE_DEFINE_ENUM(IPU);
TRACE_DEFINE_ENUM(OPU);
+TRACE_DEFINE_ENUM(HOT);
+TRACE_DEFINE_ENUM(WARM);
+TRACE_DEFINE_ENUM(COLD);
TRACE_DEFINE_ENUM(CURSEG_HOT_DATA);
TRACE_DEFINE_ENUM(CURSEG_WARM_DATA);
TRACE_DEFINE_ENUM(CURSEG_COLD_DATA);
@@ -59,6 +62,12 @@ TRACE_DEFINE_ENUM(CP_TRIMMED);
{ IPU, "IN-PLACE" }, \
{ OPU, "OUT-OF-PLACE" })

+#define show_block_temp(temp) \
+ __print_symbolic(temp, \
+ { HOT, "HOT" }, \
+ { WARM, "WARM" }, \
+ { COLD, "COLD" })
+
#define F2FS_OP_FLAGS (REQ_RAHEAD | REQ_SYNC | REQ_META | REQ_PRIO | \
REQ_PREFLUSH | REQ_FUA)
#define F2FS_BIO_FLAG_MASK(t) (t & F2FS_OP_FLAGS)
@@ -757,6 +766,7 @@ DECLARE_EVENT_CLASS(f2fs__submit_page_bio,
__field(block_t, new_blkaddr)
__field(int, op)
__field(int, op_flags)
+ __field(int, temp)
__field(int, type)
),

@@ -768,16 +778,18 @@ DECLARE_EVENT_CLASS(f2fs__submit_page_bio,
__entry->new_blkaddr = fio->new_blkaddr;
__entry->op = fio->op;
__entry->op_flags = fio->op_flags;
+ __entry->temp = fio->temp;
__entry->type = fio->type;
),

TP_printk("dev = (%d,%d), ino = %lu, page_index = 0x%lx, "
- "oldaddr = 0x%llx, newaddr = 0x%llx, rw = %s(%s), type = %s",
+ "oldaddr = 0x%llx, newaddr = 0x%llx, rw = %s(%s), type = %s_%s",
show_dev_ino(__entry),
(unsigned long)__entry->index,
(unsigned long long)__entry->old_blkaddr,
(unsigned long long)__entry->new_blkaddr,
show_bio_type(__entry->op, __entry->op_flags),
+ show_block_temp(__entry->temp),
show_block_type(__entry->type))
);

--
2.11.0
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