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NFS: Add some new I/O counters for FS-Cache doing things for NFS

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Add some new NFS I/O counters for FS-Cache doing things for NFS.  A new line is
emitted into /proc/pid/mountstats if caching is enabled that looks like:

	fsc: <rok> <rfl> <wok> <wfl> <unc>

Where <rok> is the number of pages read successfully from the cache, <rfl> is
the number of failed page reads against the cache, <wok> is the number of
successful page writes to the cache, <wfl> is the number of failed page writes
to the cache, and <unc> is the number of NFS pages that have been disconnected
from the cache.

Signed-off-by: David Howells <dhowells@redhat.com>
Acked-by: Steve Dickson <steved@redhat.com>
Acked-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Acked-by: Al Viro <viro@zeniv.linux.org.uk>
Tested-by: Daire Byrne <Daire.Byrne@framestore.com>
This commit is contained in:
David Howells
2009-04-03 16:42:43 +01:00
parent d599064a1b
commit 6a51091d07
3 changed files with 41 additions and 0 deletions
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18
fs/nfs/iostat.h
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@@ -16,6 +16,9 @@
struct nfs_iostats {
unsigned long long bytes[__NFSIOS_BYTESMAX];
#ifdef CONFIG_NFS_FSCACHE
unsigned long long fscache[__NFSIOS_FSCACHEMAX];
#endif
unsigned long events[__NFSIOS_COUNTSMAX];
} ____cacheline_aligned;
@@ -57,6 +60,21 @@ static inline void nfs_add_stats(const struct inode *inode,
nfs_add_server_stats(NFS_SERVER(inode), stat, addend);
}
#ifdef CONFIG_NFS_FSCACHE
static inline void nfs_add_fscache_stats(struct inode *inode,
enum nfs_stat_fscachecounters stat,
unsigned long addend)
{
struct nfs_iostats *iostats;
int cpu;
cpu = get_cpu();
iostats = per_cpu_ptr(NFS_SERVER(inode)->io_stats, cpu);
iostats->fscache[stat] += addend;
put_cpu_no_resched();
}
#endif
static inline struct nfs_iostats *nfs_alloc_iostats(void)
{
return alloc_percpu(struct nfs_iostats);