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authorMathieu Desnoyers <mathieu.desnoyers@polymtl.ca>2007-02-10 01:45:05 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-11 10:51:28 -0800
commit23c887522e912ca494950796a95df8dd210f4b01 (patch)
treeda8c244fd7fd7eef7a413ad8df2f19b32d4a7c52 /include
parent138c5d258cf06c278f5d7fe0a806e50fe413a08f (diff)
downloadop-kernel-dev-23c887522e912ca494950796a95df8dd210f4b01.zip
op-kernel-dev-23c887522e912ca494950796a95df8dd210f4b01.tar.gz
[PATCH] Relay: add CPU hotplug support
Mathieu originally needed to add this for tracing Xen, but it's something that's needed for any application that can be tracing while cpus are added. unplug isn't supported by this patch. The thought was that at minumum a new buffer needs to be added when a cpu comes up, but it wasn't worth the effort to remove buffers on cpu down since they'd be freed soon anyway when the channel was closed. [zanussi@us.ibm.com: avoid lock_cpu_hotplug deadlock] Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Tom Zanussi <zanussi@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/linux/relay.h9
1 files changed, 7 insertions, 2 deletions
diff --git a/include/linux/relay.h b/include/linux/relay.h
index c6a48bf..759a0f9 100644
--- a/include/linux/relay.h
+++ b/include/linux/relay.h
@@ -24,7 +24,7 @@
/*
* Tracks changes to rchan/rchan_buf structs
*/
-#define RELAYFS_CHANNEL_VERSION 6
+#define RELAYFS_CHANNEL_VERSION 7
/*
* Per-cpu relay channel buffer
@@ -64,6 +64,10 @@ struct rchan
void *private_data; /* for user-defined data */
size_t last_toobig; /* tried to log event > subbuf size */
struct rchan_buf *buf[NR_CPUS]; /* per-cpu channel buffers */
+ int is_global; /* One global buffer ? */
+ struct list_head list; /* for channel list */
+ struct dentry *parent; /* parent dentry passed to open */
+ char base_filename[NAME_MAX]; /* saved base filename */
};
/*
@@ -162,7 +166,8 @@ struct rchan *relay_open(const char *base_filename,
struct dentry *parent,
size_t subbuf_size,
size_t n_subbufs,
- struct rchan_callbacks *cb);
+ struct rchan_callbacks *cb,
+ void *private_data);
extern void relay_close(struct rchan *chan);
extern void relay_flush(struct rchan *chan);
extern void relay_subbufs_consumed(struct rchan *chan,
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