NFS: Replace dprintk callsites in nfs_readpage(s)

These new events report slightly different information for readpage
and readpages/readahead.

For readpage:
             fsx-1387  [006]   380.761896: nfs_aop_readpage:    fileid=00:28:2 fhandle=0x36fbbe51 version=1752899355910932437 offset=131072
             fsx-1387  [006]   380.761900: nfs_aop_readpage_done: fileid=00:28:2 fhandle=0x36fbbe51 version=1752899355910932437 offset=131072 ret=0

The index of a synchronous single-page read is reported.

For readpages:

             fsx-1387  [006]   380.760847: nfs_aop_readahead:   fileid=00:28:2 fhandle=0x36fbbe51 version=1752899355909932456 nr_pages=3
             fsx-1387  [006]   380.760853: nfs_aop_readahead_done: fileid=00:28:2 fhandle=0x36fbbe51 version=1752899355909932456 nr_pages=3 ret=0

The count of pages requested is reported. nfs_readpages does not
wait for the READ requests to complete.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>

diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 82b5112..83e9615 100644 (file)
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -862,6 +862,152 @@ TRACE_EVENT(nfs_sillyrename_unlink,
                )
 );
 
+TRACE_EVENT(nfs_aop_readpage,
+               TP_PROTO(
+                       const struct inode *inode,
+                       struct page *page
+               ),
+
+               TP_ARGS(inode, page),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(u32, fhandle)
+                       __field(u64, fileid)
+                       __field(u64, version)
+                       __field(loff_t, offset)
+               ),
+
+               TP_fast_assign(
+                       const struct nfs_inode *nfsi = NFS_I(inode);
+
+                       __entry->dev = inode->i_sb->s_dev;
+                       __entry->fileid = nfsi->fileid;
+                       __entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+                       __entry->version = inode_peek_iversion_raw(inode);
+                       __entry->offset = page_index(page) << PAGE_SHIFT;
+               ),
+
+               TP_printk(
+                       "fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu offset=%lld",
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->fileid,
+                       __entry->fhandle, __entry->version,
+                       __entry->offset
+               )
+);
+
+TRACE_EVENT(nfs_aop_readpage_done,
+               TP_PROTO(
+                       const struct inode *inode,
+                       struct page *page,
+                       int ret
+               ),
+
+               TP_ARGS(inode, page, ret),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(u32, fhandle)
+                       __field(int, ret)
+                       __field(u64, fileid)
+                       __field(u64, version)
+                       __field(loff_t, offset)
+               ),
+
+               TP_fast_assign(
+                       const struct nfs_inode *nfsi = NFS_I(inode);
+
+                       __entry->dev = inode->i_sb->s_dev;
+                       __entry->fileid = nfsi->fileid;
+                       __entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+                       __entry->version = inode_peek_iversion_raw(inode);
+                       __entry->offset = page_index(page) << PAGE_SHIFT;
+                       __entry->ret = ret;
+               ),
+
+               TP_printk(
+                       "fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu offset=%lld ret=%d",
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->fileid,
+                       __entry->fhandle, __entry->version,
+                       __entry->offset, __entry->ret
+               )
+);
+
+TRACE_EVENT(nfs_aop_readahead,
+               TP_PROTO(
+                       const struct inode *inode,
+                       unsigned int nr_pages
+               ),
+
+               TP_ARGS(inode, nr_pages),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(u32, fhandle)
+                       __field(u64, fileid)
+                       __field(u64, version)
+                       __field(unsigned int, nr_pages)
+               ),
+
+               TP_fast_assign(
+                       const struct nfs_inode *nfsi = NFS_I(inode);
+
+                       __entry->dev = inode->i_sb->s_dev;
+                       __entry->fileid = nfsi->fileid;
+                       __entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+                       __entry->version = inode_peek_iversion_raw(inode);
+                       __entry->nr_pages = nr_pages;
+               ),
+
+               TP_printk(
+                       "fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu nr_pages=%u",
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->fileid,
+                       __entry->fhandle, __entry->version,
+                       __entry->nr_pages
+               )
+);
+
+TRACE_EVENT(nfs_aop_readahead_done,
+               TP_PROTO(
+                       const struct inode *inode,
+                       unsigned int nr_pages,
+                       int ret
+               ),
+
+               TP_ARGS(inode, nr_pages, ret),
+
+               TP_STRUCT__entry(
+                       __field(dev_t, dev)
+                       __field(u32, fhandle)
+                       __field(int, ret)
+                       __field(u64, fileid)
+                       __field(u64, version)
+                       __field(unsigned int, nr_pages)
+               ),
+
+               TP_fast_assign(
+                       const struct nfs_inode *nfsi = NFS_I(inode);
+
+                       __entry->dev = inode->i_sb->s_dev;
+                       __entry->fileid = nfsi->fileid;
+                       __entry->fhandle = nfs_fhandle_hash(&nfsi->fh);
+                       __entry->version = inode_peek_iversion_raw(inode);
+                       __entry->nr_pages = nr_pages;
+                       __entry->ret = ret;
+               ),
+
+               TP_printk(
+                       "fileid=%02x:%02x:%llu fhandle=0x%08x version=%llu nr_pages=%u ret=%d",
+                       MAJOR(__entry->dev), MINOR(__entry->dev),
+                       (unsigned long long)__entry->fileid,
+                       __entry->fhandle, __entry->version,
+                       __entry->nr_pages, __entry->ret
+               )
+);
+
 TRACE_EVENT(nfs_initiate_read,
                TP_PROTO(
                        const struct nfs_pgio_header *hdr

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 08d6cc5..c8273d4 100644 (file)
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -337,8 +337,7 @@ int nfs_readpage(struct file *file, struct page *page)
        struct inode *inode = page_file_mapping(page)->host;
        int ret;
 
-       dprintk("NFS: nfs_readpage (%p %ld@%lu)\n",
-               page, PAGE_SIZE, page_index(page));
+       trace_nfs_aop_readpage(inode, page);
        nfs_inc_stats(inode, NFSIOS_VFSREADPAGE);
 
        /*
@@ -390,9 +389,11 @@ out_wait:
        }
 out:
        put_nfs_open_context(desc.ctx);
+       trace_nfs_aop_readpage_done(inode, page, ret);
        return ret;
 out_unlock:
        unlock_page(page);
+       trace_nfs_aop_readpage_done(inode, page, ret);
        return ret;
 }
 
@@ -403,10 +404,7 @@ int nfs_readpages(struct file *file, struct address_space *mapping,
        struct inode *inode = mapping->host;
        int ret;
 
-       dprintk("NFS: nfs_readpages (%s/%Lu %d)\n",
-                       inode->i_sb->s_id,
-                       (unsigned long long)NFS_FILEID(inode),
-                       nr_pages);
+       trace_nfs_aop_readahead(inode, nr_pages);
        nfs_inc_stats(inode, NFSIOS_VFSREADPAGES);
 
        ret = -ESTALE;
@@ -439,6 +437,7 @@ int nfs_readpages(struct file *file, struct address_space *mapping,
 read_complete:
        put_nfs_open_context(desc.ctx);
 out:
+       trace_nfs_aop_readahead_done(inode, nr_pages, ret);
        return ret;
 }