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Diffstat (limited to 'Documentation/ABI/testing/procfs-nfsd-reply_cache_stats')
| -rw-r--r-- | Documentation/ABI/testing/procfs-nfsd-reply_cache_stats | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/procfs-nfsd-reply_cache_stats b/Documentation/ABI/testing/procfs-nfsd-reply_cache_stats new file mode 100644 index 000000000000..57ed5f8e6597 --- /dev/null +++ b/Documentation/ABI/testing/procfs-nfsd-reply_cache_stats @@ -0,0 +1,38 @@ +What: /proc/fs/nfsd/reply_cache_stats +Date: March 2013 +KernelVersion: 3.10 +Contact: linux-nfs@vger.kernel.org +Description: + Provides statistics for the NFS server duplicate reply + cache (DRC). The file contains one labeled field per + line. Each line has the form "field name:" followed by + whitespace and a decimal value. + + Fields: + + ======================= ====== ========================== + max entries u32 Upper bound on cache size + num entries u32 Current entry count + hash buckets u32 Number of hash buckets + mem usage s64 Bytes consumed by the DRC + cache hits s64 Requests answered from cache + cache misses s64 Requests not found in cache + not cached s64 Idempotent requests that + bypass the cache + payload misses s64 XID matched but request + checksum did not + longest chain len u32 Longest hash chain observed + cachesize at longest u32 Cache size when longest + chain was recorded + ======================= ====== ========================== + + Counter fields (cache hits, cache misses, not cached, + payload misses, mem usage) are maintained with per-cpu + counters and may briefly show stale values under + concurrent load. There is no way to reset these + counters; consumers should compute rates by sampling + over time. + + New fields may be appended in future kernels. Parsers + should match on field name, not line position. +Users: nfs-utils (https://git.linux-nfs.org/?p=steved/nfs-utils.git) |