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Subject[PATCH 12/25] staging: erofs: support tracepoint
Date
From: Chao Yu <yuchao0@huawei.com>

Add basic tracepoints for ->readpage{,s}, ->lookup,
->destroy_inode, fill_inode and map_blocks.

Reviewed-by: Gao Xiang <gaoxiang25@huawei.com>
Signed-off-by: Chao Yu <yuchao0@huawei.com>
---
drivers/staging/erofs/data.c | 13 +-
drivers/staging/erofs/include/trace/events/erofs.h | 240 +++++++++++++++++++++
drivers/staging/erofs/inode.c | 4 +
drivers/staging/erofs/namei.c | 4 +
drivers/staging/erofs/super.c | 3 +
5 files changed, 261 insertions(+), 3 deletions(-)
create mode 100644 drivers/staging/erofs/include/trace/events/erofs.h

diff --git a/drivers/staging/erofs/data.c b/drivers/staging/erofs/data.c
index 4ddb5c0..47d1787 100644
--- a/drivers/staging/erofs/data.c
+++ b/drivers/staging/erofs/data.c
@@ -13,6 +13,8 @@
#include "internal.h"
#include <linux/prefetch.h>

+#include <trace/events/erofs.h>
+
static inline void read_endio(struct bio *bio)
{
int i;
@@ -113,6 +115,7 @@ static int erofs_map_blocks_flatmode(struct inode *inode,
u64 offset = map->m_la;
struct erofs_vnode *vi = EROFS_V(inode);

+ trace_erofs_map_blocks_flatmode_enter(inode, map, flags);
BUG_ON(is_inode_layout_compression(inode));

nblocks = DIV_ROUND_UP(inode->i_size, PAGE_SIZE);
@@ -150,8 +153,7 @@ static int erofs_map_blocks_flatmode(struct inode *inode,

out:
map->m_llen = map->m_plen;
- debugln("%s, m_la 0x%llx m_pa %llx m_len %llu",
- __func__, map->m_la, map->m_pa, map->m_plen);
+ trace_erofs_map_blocks_flatmode_exit(inode, map, flags, 0);
return 0;
}

@@ -305,6 +307,8 @@ static int erofs_raw_access_readpage(struct file *file, struct page *page)
erofs_off_t last_block;
struct bio *bio;

+ trace_erofs_readpage(page, true);
+
bio = erofs_read_raw_page(NULL, page->mapping,
page, &last_block, 1, false);

@@ -322,9 +326,12 @@ static int erofs_raw_access_readpages(struct file *filp,
erofs_off_t last_block;
struct bio *bio = NULL;
gfp_t gfp = readahead_gfp_mask(mapping);
+ struct page *page = list_last_entry(pages, struct page, lru);
+
+ trace_erofs_readpages(mapping->host, page, nr_pages, true);

for (; nr_pages; --nr_pages) {
- struct page *page = list_entry(pages->prev, struct page, lru);
+ page = list_entry(pages->prev, struct page, lru);

prefetchw(&page->flags);
list_del(&page->lru);
diff --git a/drivers/staging/erofs/include/trace/events/erofs.h b/drivers/staging/erofs/include/trace/events/erofs.h
new file mode 100644
index 0000000..5aead93
--- /dev/null
+++ b/drivers/staging/erofs/include/trace/events/erofs.h
@@ -0,0 +1,240 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM erofs
+
+#if !defined(_TRACE_EROFS_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_EROFS_H
+
+#include <linux/tracepoint.h>
+
+#define show_dev(dev) MAJOR(dev), MINOR(dev)
+#define show_dev_nid(entry) show_dev(entry->dev), entry->nid
+
+#define show_file_type(type) \
+ __print_symbolic(type, \
+ { 0, "FILE" }, \
+ { 1, "DIR" })
+
+#define show_map_flags(flags) __print_flags(flags, "|", \
+ { EROFS_GET_BLOCKS_RAW, "RAW" })
+
+#define show_mflags(flags) __print_flags(flags, "", \
+ { EROFS_MAP_MAPPED, "M" }, \
+ { EROFS_MAP_META, "I" }, \
+ { EROFS_MAP_ZIPPED, "Z" })
+
+TRACE_EVENT(erofs_lookup,
+
+ TP_PROTO(struct inode *dir, struct dentry *dentry, unsigned int flags),
+
+ TP_ARGS(dir, dentry, flags),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev )
+ __field(erofs_nid_t, nid )
+ __field(const char *, name )
+ __field(unsigned int, flags )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = dir->i_sb->s_dev;
+ __entry->nid = EROFS_V(dir)->nid;
+ __entry->name = dentry->d_name.name;
+ __entry->flags = flags;
+ ),
+
+ TP_printk("dev = (%d,%d), pnid = %llu, name:%s, flags:%x",
+ show_dev_nid(__entry),
+ __entry->name,
+ __entry->flags)
+);
+
+TRACE_EVENT(erofs_fill_inode,
+ TP_PROTO(struct inode *inode, int isdir),
+ TP_ARGS(inode, isdir),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev )
+ __field(erofs_nid_t, nid )
+ __field(erofs_blk_t, blkaddr )
+ __field(unsigned int, ofs )
+ __field(int, isdir )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->nid = EROFS_V(inode)->nid;
+ __entry->blkaddr = erofs_blknr(iloc(EROFS_I_SB(inode), __entry->nid));
+ __entry->ofs = erofs_blkoff(iloc(EROFS_I_SB(inode), __entry->nid));
+ __entry->isdir = isdir;
+ ),
+
+ TP_printk("dev = (%d,%d), nid = %llu, blkaddr %u ofs %u, isdir %d",
+ show_dev_nid(__entry),
+ __entry->blkaddr, __entry->ofs,
+ __entry->isdir)
+);
+
+TRACE_EVENT(erofs_readpage,
+
+ TP_PROTO(struct page *page, bool raw),
+
+ TP_ARGS(page, raw),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev )
+ __field(erofs_nid_t, nid )
+ __field(int, dir )
+ __field(pgoff_t, index )
+ __field(int, uptodate)
+ __field(bool, raw )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = page->mapping->host->i_sb->s_dev;
+ __entry->nid = EROFS_V(page->mapping->host)->nid;
+ __entry->dir = S_ISDIR(page->mapping->host->i_mode);
+ __entry->index = page->index;
+ __entry->uptodate = PageUptodate(page);
+ __entry->raw = raw;
+ ),
+
+ TP_printk("dev = (%d,%d), nid = %llu, %s, index = %lu, uptodate = %d "
+ "raw = %d",
+ show_dev_nid(__entry),
+ show_file_type(__entry->dir),
+ (unsigned long)__entry->index,
+ __entry->uptodate,
+ __entry->raw)
+);
+
+TRACE_EVENT(erofs_readpages,
+
+ TP_PROTO(struct inode *inode, struct page *page, unsigned int nrpage,
+ bool raw),
+
+ TP_ARGS(inode, page, nrpage, raw),
+
+ TP_STRUCT__entry(
+ __field(dev_t, dev )
+ __field(erofs_nid_t, nid )
+ __field(pgoff_t, start )
+ __field(unsigned int, nrpage )
+ __field(bool, raw )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->nid = EROFS_V(inode)->nid;
+ __entry->start = page->index;
+ __entry->nrpage = nrpage;
+ __entry->raw = raw;
+ ),
+
+ TP_printk("dev = (%d,%d), nid = %llu, start = %lu nrpage = %u raw = %d",
+ show_dev_nid(__entry),
+ (unsigned long)__entry->start,
+ __entry->nrpage,
+ __entry->raw)
+);
+
+DECLARE_EVENT_CLASS(erofs__map_blocks_enter,
+ TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
+ unsigned int flags),
+
+ TP_ARGS(inode, map, flags),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( erofs_nid_t, nid )
+ __field( erofs_off_t, la )
+ __field( u64, llen )
+ __field( unsigned int, flags )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->nid = EROFS_V(inode)->nid;
+ __entry->la = map->m_la;
+ __entry->llen = map->m_llen;
+ __entry->flags = flags;
+ ),
+
+ TP_printk("dev = (%d,%d), nid = %llu, la %llu llen %llu flags %s",
+ show_dev_nid(__entry),
+ __entry->la, __entry->llen, show_map_flags(__entry->flags))
+);
+
+DEFINE_EVENT(erofs__map_blocks_enter, erofs_map_blocks_flatmode_enter,
+ TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
+ unsigned flags),
+
+ TP_ARGS(inode, map, flags)
+);
+
+DECLARE_EVENT_CLASS(erofs__map_blocks_exit,
+ TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
+ unsigned int flags, int ret),
+
+ TP_ARGS(inode, map, flags, ret),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( erofs_nid_t, nid )
+ __field( unsigned int, flags )
+ __field( erofs_off_t, la )
+ __field( erofs_off_t, pa )
+ __field( u64, llen )
+ __field( u64, plen )
+ __field( unsigned int, mflags )
+ __field( int, ret )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->nid = EROFS_V(inode)->nid;
+ __entry->flags = flags;
+ __entry->la = map->m_la;
+ __entry->pa = map->m_pa;
+ __entry->llen = map->m_llen;
+ __entry->plen = map->m_plen;
+ __entry->mflags = map->m_flags;
+ __entry->ret = ret;
+ ),
+
+ TP_printk("dev = (%d,%d), nid = %llu, flags %s "
+ "la %llu pa %llu llen %llu plen %llu mflags %s ret %d",
+ show_dev_nid(__entry), show_map_flags(__entry->flags),
+ __entry->la, __entry->pa, __entry->llen, __entry->plen,
+ show_mflags(__entry->mflags), __entry->ret)
+);
+
+DEFINE_EVENT(erofs__map_blocks_exit, erofs_map_blocks_flatmode_exit,
+ TP_PROTO(struct inode *inode, struct erofs_map_blocks *map,
+ unsigned flags, int ret),
+
+ TP_ARGS(inode, map, flags, ret)
+);
+
+TRACE_EVENT(erofs_destroy_inode,
+ TP_PROTO(struct inode *inode),
+
+ TP_ARGS(inode),
+
+ TP_STRUCT__entry(
+ __field( dev_t, dev )
+ __field( erofs_nid_t, nid )
+ ),
+
+ TP_fast_assign(
+ __entry->dev = inode->i_sb->s_dev;
+ __entry->nid = EROFS_V(inode)->nid;
+ ),
+
+ TP_printk("dev = (%d,%d), nid = %llu", show_dev_nid(__entry))
+);
+
+#endif /* _TRACE_EROFS_H */
+
+ /* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/drivers/staging/erofs/inode.c b/drivers/staging/erofs/inode.c
index a6d3e12..613c977 100644
--- a/drivers/staging/erofs/inode.c
+++ b/drivers/staging/erofs/inode.c
@@ -12,6 +12,8 @@
*/
#include "xattr.h"

+#include <trace/events/erofs.h>
+
/* no locking */
static int read_inode(struct inode *inode, void *data)
{
@@ -152,6 +154,8 @@ static int fill_inode(struct inode *inode, int isdir)
erofs_blk_t blkaddr;
unsigned ofs;

+ trace_erofs_fill_inode(inode, isdir);
+
blkaddr = erofs_blknr(iloc(sbi, vi->nid));
ofs = erofs_blkoff(iloc(sbi, vi->nid));

diff --git a/drivers/staging/erofs/namei.c b/drivers/staging/erofs/namei.c
index 989876b..d2a0da3 100644
--- a/drivers/staging/erofs/namei.c
+++ b/drivers/staging/erofs/namei.c
@@ -13,6 +13,8 @@
#include "internal.h"
#include "xattr.h"

+#include <trace/events/erofs.h>
+
/* based on the value of qn->len is accurate */
static inline int dirnamecmp(struct qstr *qn,
struct qstr *qd, unsigned *matched)
@@ -209,6 +211,8 @@ static struct dentry *erofs_lookup(struct inode *dir,
/* dentry must be unhashed in lookup, no need to worry about */
DBG_BUGON(!d_unhashed(dentry));

+ trace_erofs_lookup(dir, dentry, flags);
+
/* file name exceeds fs limit */
if (unlikely(dentry->d_name.len > EROFS_NAME_LEN))
return ERR_PTR(-ENAMETOOLONG);
diff --git a/drivers/staging/erofs/super.c b/drivers/staging/erofs/super.c
index 701425f..054375d 100644
--- a/drivers/staging/erofs/super.c
+++ b/drivers/staging/erofs/super.c
@@ -17,6 +17,9 @@
#include <linux/seq_file.h>
#include "internal.h"

+#define CREATE_TRACE_POINTS
+#include <trace/events/erofs.h>
+
static struct kmem_cache *erofs_inode_cachep __read_mostly;

static void init_once(void *ptr)
--
1.9.1
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