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NFSD: Add tracepoints to NFSD's duplicate reply cache

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Try to capture DRC failures.

Two additional clean-ups:
- Introduce Doxygen-style comments for the main entry points
- Remove a dprintk that fires for an allocation failure. This was
  the only dprintk in the REPCACHE class.

Reported-by: kbuild test robot <lkp@intel.com>
[ cel: force typecast for display of checksum values ]
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Chuck Lever
2020-05-02 11:34:40 -04:00
parent d88ff9587b
commit 0b175b1864
2 changed files with 94 additions and 22 deletions
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59
fs/nfsd/trace.h
View File

@@ -432,6 +432,65 @@ TRACE_EVENT(nfsd_file_fsnotify_handle_event,
__entry->nlink, __entry->mode, __entry->mask)
);
#include "cache.h"
TRACE_DEFINE_ENUM(RC_DROPIT);
TRACE_DEFINE_ENUM(RC_REPLY);
TRACE_DEFINE_ENUM(RC_DOIT);
#define show_drc_retval(x) \
__print_symbolic(x, \
{ RC_DROPIT, "DROPIT" }, \
{ RC_REPLY, "REPLY" }, \
{ RC_DOIT, "DOIT" })
TRACE_EVENT(nfsd_drc_found,
TP_PROTO(
const struct nfsd_net *nn,
const struct svc_rqst *rqstp,
int result
),
TP_ARGS(nn, rqstp, result),
TP_STRUCT__entry(
__field(unsigned long long, boot_time)
__field(unsigned long, result)
__field(u32, xid)
),
TP_fast_assign(
__entry->boot_time = nn->boot_time;
__entry->result = result;
__entry->xid = be32_to_cpu(rqstp->rq_xid);
),
TP_printk("boot_time=%16llx xid=0x%08x result=%s",
__entry->boot_time, __entry->xid,
show_drc_retval(__entry->result))
);
TRACE_EVENT(nfsd_drc_mismatch,
TP_PROTO(
const struct nfsd_net *nn,
const struct svc_cacherep *key,
const struct svc_cacherep *rp
),
TP_ARGS(nn, key, rp),
TP_STRUCT__entry(
__field(unsigned long long, boot_time)
__field(u32, xid)
__field(u32, cached)
__field(u32, ingress)
),
TP_fast_assign(
__entry->boot_time = nn->boot_time;
__entry->xid = be32_to_cpu(key->c_key.k_xid);
__entry->cached = (__force u32)key->c_key.k_csum;
__entry->ingress = (__force u32)rp->c_key.k_csum;
),
TP_printk("boot_time=%16llx xid=0x%08x cached-csum=0x%08x ingress-csum=0x%08x",
__entry->boot_time, __entry->xid, __entry->cached,
__entry->ingress)
);
#endif /* _NFSD_TRACE_H */
#undef TRACE_INCLUDE_PATH