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sunrpc: Change rpc_print_iostats to rpc_clnt_show_stats and handle rpc_clnt clones 

The existing rpc_print_iostats has a few shortcomings.  First, the naming
is not consistent with other functions in the kernel that display stats.
Second, it is really displaying stats for an rpc_clnt structure as it
displays both xprt stats and per-op stats.  Third, it does not handle
rpc_clnt clones, which is important for the one in-kernel tree caller
of this function, the NFS client's nfs_show_stats function.

Fix all of the above by renaming the rpc_print_iostats to
rpc_clnt_show_stats and looping through any rpc_clnt clones via
cl_parent.

Once this interface is fixed, this addresses a problem with NFSv4.
Before this patch, the /proc/self/mountstats always showed incorrect
counts for NFSv4 lease and session related opcodes such as SEQUENCE,
RENEW, SETCLIENTID, CREATE_SESSION, etc.  These counts were always 0
even though many ops would go over the wire.  The reason for this is
there are multiple rpc_clnt structures allocated for any given NFSv4
mount, and inside nfs_show_stats() we callled into rpc_print_iostats()
which only handled one of them, nfs_server->client.  Fix these counts
by calling sunrpc's new rpc_clnt_show_stats() function, which handles
cloned rpc_clnt structs and prints the stats together.

Note that one side-effect of the above is that multiple mounts from
the same NFS server will show identical counts in the above ops due
to the fact the one rpc_clnt (representing the NFSv4 client state)
is shared across mounts.

Signed-off-by: Dave Wysochanski <dwysocha@redhat.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Dave Wysochanski 2018-07-31 10:10:51 -04:00 committed by Anna Schumaker
parent 189e195567
commit 016583d703
3 changed files with 15 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
fs/nfs/super.c
View File

@ -884,7 +884,7 @@ int nfs_show_stats(struct seq_file *m, struct dentry *root)
#endif
seq_printf(m, "\n");
rpc_print_iostats(m, nfss->client);
rpc_clnt_show_stats(m, nfss->client);
return 0;
}

4
include/linux/sunrpc/metrics.h
View File

@ -82,7 +82,7 @@ void rpc_count_iostats(const struct rpc_task *,
struct rpc_iostats *);
void rpc_count_iostats_metrics(const struct rpc_task *,
struct rpc_iostats *);
void rpc_print_iostats(struct seq_file *, struct rpc_clnt *);
void rpc_clnt_show_stats(struct seq_file *, struct rpc_clnt *);
void rpc_free_iostats(struct rpc_iostats *);
#else /* CONFIG_PROC_FS */
@ -95,7 +95,7 @@ static inline void rpc_count_iostats_metrics(const struct rpc_task *task,
{
}
static inline void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt) {}
static inline void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt) {}
static inline void rpc_free_iostats(struct rpc_iostats *stats) {}
#endif /* CONFIG_PROC_FS */

17
net/sunrpc/stats.c
View File

@ -235,13 +235,12 @@ static void _print_rpc_iostats(struct seq_file *seq, struct rpc_iostats *stats,
ktime_to_ms(stats->om_execute));
}
void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
void rpc_clnt_show_stats(struct seq_file *seq, struct rpc_clnt *clnt)
{
struct rpc_iostats *stats = clnt->cl_metrics;
struct rpc_xprt *xprt;
unsigned int op, maxproc = clnt->cl_maxproc;
if (!stats)
if (!clnt->cl_metrics)
return;
seq_printf(seq, "\tRPC iostats version: %s ", RPC_IOSTATS_VERS);
@ -256,10 +255,18 @@ void rpc_print_iostats(struct seq_file *seq, struct rpc_clnt *clnt)
seq_printf(seq, "\tper-op statistics\n");
for (op = 0; op < maxproc; op++) {
_print_rpc_iostats(seq, &stats[op], op, clnt->cl_procinfo);
struct rpc_iostats stats = {};
struct rpc_clnt *next = clnt;
do {
_add_rpc_iostats(&stats, &next->cl_metrics[op]);
if (next == next->cl_parent)
break;
next = next->cl_parent;
} while (next);
_print_rpc_iostats(seq, &stats, op, clnt->cl_procinfo);
}
}
EXPORT_SYMBOL_GPL(rpc_print_iostats);
EXPORT_SYMBOL_GPL(rpc_clnt_show_stats);
/*
* Register/unregister RPC proc files