diff options
| -rw-r--r-- | include/linux/relay.h | 9 | ||||
| -rw-r--r-- | kernel/relay.c | 8 |
2 files changed, 16 insertions, 1 deletions
diff --git a/include/linux/relay.h b/include/linux/relay.h index e10a0fdf4325..cd77eb285a48 100644 --- a/include/linux/relay.h +++ b/include/linux/relay.h @@ -29,6 +29,14 @@ #define RELAYFS_CHANNEL_VERSION 7 /* + * Relay buffer statistics + */ +struct rchan_buf_stats +{ + unsigned int full_count; /* counter for buffer full */ +}; + +/* * Per-cpu relay channel buffer */ struct rchan_buf @@ -43,6 +51,7 @@ struct rchan_buf struct irq_work wakeup_work; /* reader wakeup */ struct dentry *dentry; /* channel file dentry */ struct kref kref; /* channel buffer refcount */ + struct rchan_buf_stats stats; /* buffer stats */ struct page **page_array; /* array of current buffer pages */ unsigned int page_count; /* number of current buffer pages */ unsigned int finalized; /* buffer has been finalized */ diff --git a/kernel/relay.c b/kernel/relay.c index fc6ad76b789d..4b07efddc2cf 100644 --- a/kernel/relay.c +++ b/kernel/relay.c @@ -251,8 +251,13 @@ EXPORT_SYMBOL_GPL(relay_buf_full); static int relay_subbuf_start(struct rchan_buf *buf, void *subbuf, void *prev_subbuf) { + int full = relay_buf_full(buf); + + if (full) + buf->stats.full_count++; + if (!buf->chan->cb->subbuf_start) - return !relay_buf_full(buf); + return !full; return buf->chan->cb->subbuf_start(buf, subbuf, prev_subbuf); @@ -297,6 +302,7 @@ static void __relay_reset(struct rchan_buf *buf, unsigned int init) buf->finalized = 0; buf->data = buf->start; buf->offset = 0; + buf->stats.full_count = 0; for (i = 0; i < buf->chan->n_subbufs; i++) buf->padding[i] = 0; |