[PATCH v4.1 09/11] xfs: add a tracepoint for blockgc scans

From: "Darrick J. Wong" <djwong@kernel.org>
To: Christoph Hellwig <hch@lst.de>,
	linux-xfs@vger.kernel.org, hch@infradead.org,
	david@fromorbit.com, Brian Foster <bfoster@redhat.com>
Subject: [PATCH v4.1 09/11] xfs: add a tracepoint for blockgc scans
Date: Mon, 25 Jan 2021 20:56:29 -0800	[thread overview]
Message-ID: <20210126045629.GQ7698@magnolia> (raw)
In-Reply-To: <161142796954.2171939.15250362023143903757.stgit@magnolia>

From: Darrick J. Wong <djwong@kernel.org>

Add some tracepoints so that we can observe when the speculative
preallocation garbage collector runs.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
v4.1: fix a potential null deref in the tracepoint
---
 fs/xfs/xfs_ioctl.c |    2 ++
 fs/xfs/xfs_trace.c |    1 +
 fs/xfs/xfs_trace.h |   41 +++++++++++++++++++++++++++++++++++++++++
 3 files changed, 44 insertions(+)

diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index dab525c2437c..da3da8677067 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -2359,6 +2359,8 @@ xfs_file_ioctl(
 		if (error)
 			return error;
 
+		trace_xfs_ioc_free_eofblocks(mp, &keofb, _RET_IP_);
+
 		sb_start_write(mp->m_super);
 		error = xfs_icache_free_eofblocks(mp, &keofb);
 		sb_end_write(mp->m_super);
diff --git a/fs/xfs/xfs_trace.c b/fs/xfs/xfs_trace.c
index 120398a37c2a..9b8d703dc9fd 100644
--- a/fs/xfs/xfs_trace.c
+++ b/fs/xfs/xfs_trace.c
@@ -29,6 +29,7 @@
 #include "xfs_filestream.h"
 #include "xfs_fsmap.h"
 #include "xfs_btree_staging.h"
+#include "xfs_icache.h"
 
 /*
  * We include this last to have the helpers above available for the trace
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index 407c3a5208ab..38649e3341cb 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -37,6 +37,7 @@ struct xfs_trans_res;
 struct xfs_inobt_rec_incore;
 union xfs_btree_ptr;
 struct xfs_dqtrx;
+struct xfs_eofblocks;
 
 #define XFS_ATTR_FILTER_FLAGS \
 	{ XFS_ATTR_ROOT,	"ROOT" }, \
@@ -3888,6 +3889,46 @@ DEFINE_EVENT(xfs_timestamp_range_class, name, \
 DEFINE_TIMESTAMP_RANGE_EVENT(xfs_inode_timestamp_range);
 DEFINE_TIMESTAMP_RANGE_EVENT(xfs_quota_expiry_range);
 
+DECLARE_EVENT_CLASS(xfs_eofblocks_class,
+	TP_PROTO(struct xfs_mount *mp, struct xfs_eofblocks *eofb,
+		 unsigned long caller_ip),
+	TP_ARGS(mp, eofb, caller_ip),
+	TP_STRUCT__entry(
+		__field(dev_t, dev)
+		__field(__u32, flags)
+		__field(uint32_t, uid)
+		__field(uint32_t, gid)
+		__field(prid_t, prid)
+		__field(__u64, min_file_size)
+		__field(unsigned long, caller_ip)
+	),
+	TP_fast_assign(
+		__entry->dev = mp->m_super->s_dev;
+		__entry->flags = eofb ? eofb->eof_flags : 0;
+		__entry->uid = eofb ? from_kuid(mp->m_super->s_user_ns,
+						eofb->eof_uid) : 0;
+		__entry->gid = eofb ? from_kgid(mp->m_super->s_user_ns,
+						eofb->eof_gid) : 0;
+		__entry->prid = eofb ? eofb->eof_prid : 0;
+		__entry->min_file_size = eofb ? eofb->eof_min_file_size : 0;
+		__entry->caller_ip = caller_ip;
+	),
+	TP_printk("dev %d:%d flags 0x%x uid %u gid %u prid %u minsize %llu caller %pS",
+		  MAJOR(__entry->dev), MINOR(__entry->dev),
+		  __entry->flags,
+		  __entry->uid,
+		  __entry->gid,
+		  __entry->prid,
+		  __entry->min_file_size,
+		  (char *)__entry->caller_ip)
+);
+#define DEFINE_EOFBLOCKS_EVENT(name)	\
+DEFINE_EVENT(xfs_eofblocks_class, name,	\
+	TP_PROTO(struct xfs_mount *mp, struct xfs_eofblocks *eofb, \
+		 unsigned long caller_ip), \
+	TP_ARGS(mp, eofb, caller_ip))
+DEFINE_EOFBLOCKS_EVENT(xfs_ioc_free_eofblocks);
+
 #endif /* _TRACE_XFS_H */
 
 #undef TRACE_INCLUDE_PATH
