This patch adds compression and decompression trace points for the
purpose of debugging.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
---
v2:
. Use better naming.
(If transform is not good enough I have run out of ideas, pls suggest).
. To be applied on top of
git://git.kernel.org/pub/scm/linux/kernel/git/kdave/linux.git for-next
(tested without namelen check patch set).
fs/btrfs/compression.c | 11 +++++++++++
include/trace/events/btrfs.h | 44 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 55 insertions(+)
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index fd6508bcff77..53908722d80e 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -884,6 +884,10 @@ int btrfs_compress_pages(int type, struct address_space *mapping,
start, pages,
out_pages,
total_in, total_out);
+
+ trace_btrfs_data_transformer(0, 0, mapping->host, type, *total_in,
+ *total_out, start, ret);
+
free_workspace(type, workspace);
return ret;
}
@@ -910,6 +914,10 @@ static int btrfs_decompress_bio(struct compressed_bio *cb)
workspace = find_workspace(type);
ret = btrfs_compress_op[type - 1]->decompress_bio(workspace, cb);
+
+ trace_btrfs_data_transformer(1, 1, cb->inode, type,
+ cb->compressed_len, cb->len, cb->start, ret);
+
free_workspace(type, workspace);
return ret;
@@ -932,6 +940,9 @@ int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
dest_page, start_byte,
srclen, destlen);
+ trace_btrfs_data_transformer(1, 0, dest_page->mapping->host,
+ type, srclen, destlen, start_byte, ret);
+
free_workspace(type, workspace);
return ret;
}
diff --git a/include/trace/events/btrfs.h b/include/trace/events/btrfs.h
index cd99a3658156..7c2442dab6a0 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -1622,6 +1622,50 @@ TRACE_EVENT(qgroup_meta_reserve,
show_root_type(__entry->refroot), __entry->diff)
);
+#define show_transformer_type(type) \
+ __print_symbolic(type, \
+ { BTRFS_COMPRESS_ZLIB, "zlib" }, \
+ { BTRFS_COMPRESS_LZO, "lzo" })
+
+TRACE_EVENT(btrfs_data_transformer,
+
+ TP_PROTO(int uncompress, int its_bio, struct inode *inode, int type,
+ unsigned long len_before, unsigned long len_after,
+ unsigned long start, int ret),
+
+ TP_ARGS(uncompress, its_bio, inode, type, len_before,
+ len_after, start, ret),
+
+ TP_STRUCT__entry_btrfs(
+ __field( int, uncompress)
+ __field( int, its_bio)
+ __field( ino_t, i_ino)
+ __field( int, type)
+ __field( unsigned long, len_before)
+ __field( unsigned long, len_after)
+ __field( unsigned long, start)
+ __field( int, ret)
+ ),
+
+ TP_fast_assign_btrfs(btrfs_sb(inode->i_sb),
+ __entry->uncompress = uncompress;
+ __entry->its_bio = its_bio;
+ __entry->i_ino = inode->i_ino;
+ __entry->type = type;
+ __entry->len_before = len_before;
+ __entry->len_after = len_after;
+ __entry->start = start;
+ __entry->ret = ret;
+ ),
+
+ TP_printk_btrfs("%s %s ino=%lu type=%s len_before=%lu len_after=%lu "
+ "start=%lu ret=%d",
+ __entry->uncompress ? "untransform":"transform",
+ __entry->its_bio ? "bio":"page", __entry->i_ino,
+ show_transformer_type(__entry->type), __entry->len_before,
+ __entry->len_after, __entry->start, __entry->ret)
+
+);
#endif /* _TRACE_BTRFS_H */
/* This part must be outside protection */
--
2.13.0
--
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