linux-kernel - [PATCH 08/19] netfs: Adjust the netfs

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Message-ID: <164622996715.3564931.4252319907990358129.stgit@warthog.procyon.org.uk>
Date:   Wed, 02 Mar 2022 14:06:07 +0000
From:   David Howells <dhowells@...hat.com>
To:     linux-cachefs@...hat.com
Cc:     dhowells@...hat.com, Anna Schumaker <anna.schumaker@...app.com>,
        Steve French <sfrench@...ba.org>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jeff Layton <jlayton@...hat.com>,
        David Wysochanski <dwysocha@...hat.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeffle Xu <jefflexu@...ux.alibaba.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
        linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
        v9fs-developer@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 08/19] netfs: Adjust the netfs_rreq tracepoint slightly

Adjust the netfs_rreq tracepoint to include the origin of the request and
to increase the size of the "what trace" output strings by a character so
that "ENCRYPT" and "DECRYPT" will fit without abbreviation.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: linux-cachefs@...hat.com
---

 fs/netfs/read_helper.c       |    2 +-
 include/trace/events/netfs.h |   29 +++++++++++++++++++----------
 2 files changed, 20 insertions(+), 11 deletions(-)

diff --git a/fs/netfs/read_helper.c b/fs/netfs/read_helper.c
index 68616635c5ac..5e0fdf9c9772 100644
--- a/fs/netfs/read_helper.c
+++ b/fs/netfs/read_helper.c
@@ -180,7 +180,7 @@ static void netfs_rreq_do_write_to_cache(struct netfs_io_request *rreq)
 	struct iov_iter iter;
 	int ret;
 
-	trace_netfs_rreq(rreq, netfs_rreq_trace_write);
+	trace_netfs_rreq(rreq, netfs_rreq_trace_copy);
 
 	/* We don't want terminating writes trying to wake us up whilst we're
 	 * still going through the list.
diff --git a/include/trace/events/netfs.h b/include/trace/events/netfs.h
index 2d0665b416bf..8330ae8fbc0a 100644
--- a/include/trace/events/netfs.h
+++ b/include/trace/events/netfs.h
@@ -21,14 +21,19 @@
 	EM(netfs_read_trace_readpage,		"READPAGE ")	\
 	E_(netfs_read_trace_write_begin,	"WRITEBEGN")
 
+#define netfs_rreq_origins					\
+	EM(NETFS_READAHEAD,			"RA")		\
+	EM(NETFS_READPAGE,			"RP")		\
+	E_(NETFS_READ_FOR_WRITE,		"RW")
+
 #define netfs_rreq_traces					\
-	EM(netfs_rreq_trace_assess,		"ASSESS")	\
-	EM(netfs_rreq_trace_done,		"DONE  ")	\
-	EM(netfs_rreq_trace_free,		"FREE  ")	\
-	EM(netfs_rreq_trace_resubmit,		"RESUBM")	\
-	EM(netfs_rreq_trace_unlock,		"UNLOCK")	\
-	EM(netfs_rreq_trace_unmark,		"UNMARK")	\
-	E_(netfs_rreq_trace_write,		"WRITE ")
+	EM(netfs_rreq_trace_assess,		"ASSESS ")	\
+	EM(netfs_rreq_trace_copy,		"COPY   ")	\
+	EM(netfs_rreq_trace_done,		"DONE   ")	\
+	EM(netfs_rreq_trace_free,		"FREE   ")	\
+	EM(netfs_rreq_trace_resubmit,		"RESUBMT")	\
+	EM(netfs_rreq_trace_unlock,		"UNLOCK ")	\
+	E_(netfs_rreq_trace_unmark,		"UNMARK ")
 
 #define netfs_sreq_sources					\
 	EM(NETFS_FILL_WITH_ZEROES,		"ZERO")		\
@@ -79,6 +84,7 @@ enum netfs_failure { netfs_failures } __mode(byte);
 #define E_(a, b) TRACE_DEFINE_ENUM(a);
 
 netfs_read_traces;
+netfs_rreq_origins;
 netfs_rreq_traces;
 netfs_sreq_sources;
 netfs_sreq_traces;
@@ -134,18 +140,21 @@ TRACE_EVENT(netfs_rreq,
 
 	    TP_STRUCT__entry(
 		    __field(unsigned int,		rreq		)
-		    __field(unsigned short,		flags		)
+		    __field(unsigned int,		flags		)
+		    __field(enum netfs_io_origin,	origin		)
 		    __field(enum netfs_rreq_trace,	what		)
 			     ),
 
 	    TP_fast_assign(
 		    __entry->rreq	= rreq->debug_id;
 		    __entry->flags	= rreq->flags;
+		    __entry->origin	= rreq->origin;
 		    __entry->what	= what;
 			   ),
 
-	    TP_printk("R=%08x %s f=%02x",
+	    TP_printk("R=%08x %s %s f=%02x",
 		      __entry->rreq,
+		      __print_symbolic(__entry->origin, netfs_rreq_origins),
 		      __print_symbolic(__entry->what, netfs_rreq_traces),
 		      __entry->flags)
 	    );
@@ -182,8 +191,8 @@ TRACE_EVENT(netfs_sreq,
 
 	    TP_printk("R=%08x[%u] %s %s f=%02x s=%llx %zx/%zx e=%d",
 		      __entry->rreq, __entry->index,
-		      __print_symbolic(__entry->what, netfs_sreq_traces),
 		      __print_symbolic(__entry->source, netfs_sreq_sources),
+		      __print_symbolic(__entry->what, netfs_sreq_traces),
 		      __entry->flags,
 		      __entry->start, __entry->transferred, __entry->len,
 		      __entry->error)