From: Anand Jain <Anand.Jain@xxxxxxxxxx>
This patch adds compression and decompression trace points for the
purpose of debugging.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
Reviewed-by: Nikolay Borisov <nborisov@xxxxxxxx>
---
v3:
. Rename to a simple names, without worrying about being
compatible with the future naming.
. The type was not working fixed it.
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 | 39 +++++++++++++++++++++++++++++++++++++++
2 files changed, 50 insertions(+)
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index d2ef9ac2a630..4a652f67ee87 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -895,6 +895,10 @@ int btrfs_compress_pages(int type, struct address_space *mapping,
start, pages,
out_pages,
total_in, total_out);
+
+ trace_btrfs_compress(1, 1, mapping->host, type, *total_in,
+ *total_out, start, ret);
+
free_workspace(type, workspace);
return ret;
}
@@ -921,6 +925,10 @@ 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_compress(0, 0, cb->inode, type,
+ cb->compressed_len, cb->len, cb->start, ret);
+
free_workspace(type, workspace);
return ret;
@@ -943,6 +951,9 @@ int btrfs_decompress(int type, unsigned char *data_in, struct page *dest_page,
dest_page, start_byte,
srclen, destlen);
+ trace_btrfs_compress(0, 1, 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 d412c49f5a6a..db33d6649d12 100644
--- a/include/trace/events/btrfs.h
+++ b/include/trace/events/btrfs.h
@@ -1629,6 +1629,45 @@ TRACE_EVENT(qgroup_meta_reserve,
show_root_type(__entry->refroot), __entry->diff)
);
+TRACE_EVENT(btrfs_compress,
+
+ TP_PROTO(int compress, int page, struct inode *inode,
+ unsigned int type,
+ unsigned long len_before, unsigned long len_after,
+ unsigned long start, int ret),
+
+ TP_ARGS(compress, page, inode, type, len_before,
+ len_after, start, ret),
+
+ TP_STRUCT__entry_btrfs(
+ __field(int, compress)
+ __field(int, page)
+ __field(ino_t, i_ino)
+ __field(unsigned 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->compress = compress;
+ __entry->page = page;
+ __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->compress ? "compress":"uncompress",
+ __entry->page ? "page":"bio", __entry->i_ino,
+ show_compress_type(__entry->type),
+ __entry->len_before, __entry->len_after, __entry->start,
+ __entry->ret)
+);
#endif /* _TRACE_BTRFS_H */
/* This part must be outside protection */
--
2.13.1
--
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