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knfsd: add file to export stats about nfsd pools

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Add /proc/fs/nfsd/pool_stats to export to userspace various
statistics about the operation of rpc server thread pools.

This patch is based on a forward-ported version of
knfsd-add-pool-thread-stats which has been shipping in the SGI
"Enhanced NFS" product since 2006 and which was previously
posted:

http://article.gmane.org/gmane.linux.nfs/10375

It has also been updated thus:

 * moved EXPORT_SYMBOL() to near the function it exports
 * made the new struct struct seq_operations const
 * used SEQ_START_TOKEN instead of ((void *)1)
 * merged fix from SGI PV 990526 "sunrpc: use dprintk instead of
   printk in svc_pool_stats_*()" by Harshula Jayasuriya.
 * merged fix from SGI PV 964001 "Crash reading pool_stats before
   nfsds are started".

Signed-off-by: Greg Banks <gnb@sgi.com>
Signed-off-by: Harshula Jayasuriya <harshula@sgi.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Greg Banks
2009-01-13 21:26:36 +11:00
committed by J. Bruce Fields
parent 59a252ff8c
commit 03cf6c9f49
4 changed files with 129 additions and 1 deletions
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11
include/linux/sunrpc/svc.h
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@@ -24,6 +24,15 @@
*/
typedef int (*svc_thread_fn)(void *);
/* statistics for svc_pool structures */
struct svc_pool_stats {
unsigned long packets;
unsigned long sockets_queued;
unsigned long threads_woken;
unsigned long overloads_avoided;
unsigned long threads_timedout;
};
/*
*
* RPC service thread pool.
@@ -42,6 +51,7 @@ struct svc_pool {
unsigned int sp_nrthreads; /* # of threads in pool */
struct list_head sp_all_threads; /* all server threads */
int sp_nwaking; /* number of threads woken but not yet active */
struct svc_pool_stats sp_stats; /* statistics on pool operation */
} ____cacheline_aligned_in_smp;
/*
@@ -396,6 +406,7 @@ struct svc_serv * svc_create_pooled(struct svc_program *, unsigned int,
sa_family_t, void (*shutdown)(struct svc_serv *),
svc_thread_fn, struct module *);
int svc_set_num_threads(struct svc_serv *, struct svc_pool *, int);
int svc_pool_stats_open(struct svc_serv *serv, struct file *file);
void svc_destroy(struct svc_serv *);
int svc_process(struct svc_rqst *);
int svc_register(const struct svc_serv *, const unsigned short,