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| author | Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | 2011-03-16 19:04:34 -0400 |
|---|---|---|
| committer | Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | 2011-03-16 19:04:34 -0400 |
| commit | 85f84b8888712d234a3746fdf74a9ff36c58a8aa (patch) | |
| tree | 0f18458cb08580a5805fbb6e2753318a25013002 /mm/swapfile.c | |
| parent | 710fff2054cc7838d7e98714e4a78610a52547a2 (diff) | |
lttng-instrumentation/lttng-instrumentation-swap
LTTng instrumentation - swap
Instrumentation of waits caused by swap activity. Also instrumentation
swapon/swapoff events to keep track of active swap partitions.
Those tracepoints are used by LTTng.
About the performance impact of tracepoints (which is comparable to markers),
even without immediate values optimizations, tests done by Hideo Aoki on ia64
show no regression. His test case was using hackbench on a kernel where
scheduler instrumentation (about 5 events in code scheduler code) was added.
See the "Tracepoints" patch header for performance result detail.
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
CC: linux-mm@kvack.org
CC: Dave Hansen <haveblue@us.ibm.com>
CC: Masami Hiramatsu <mhiramat@redhat.com>
CC: 'Peter Zijlstra' <peterz@infradead.org>
CC: "Frank Ch. Eigler" <fche@redhat.com>
CC: 'Ingo Molnar' <mingo@elte.hu>
CC: Frederic Weisbecker <fweisbec@gmail.com>
CC: 'Hideo AOKI' <haoki@redhat.com>
CC: Takashi Nishiie <t-nishiie@np.css.fujitsu.com>
CC: 'Steven Rostedt' <rostedt@goodmis.org>
CC: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 5a001ff3055..f92237cd55c 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -31,12 +31,16 @@ #include <linux/syscalls.h> #include <linux/memcontrol.h> #include <linux/poll.h> +#include <trace/swap.h> #include <asm/pgtable.h> #include <asm/tlbflush.h> #include <linux/swapops.h> #include <linux/page_cgroup.h> +DEFINE_TRACE(swap_file_open); +DEFINE_TRACE(swap_file_close); + static bool swap_count_continued(struct swap_info_struct *, pgoff_t, unsigned char); static void free_swap_count_continuations(struct swap_info_struct *); @@ -1669,6 +1673,7 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) swap_map = p->swap_map; p->swap_map = NULL; p->flags = 0; + trace_swap_file_close(swap_file); spin_unlock(&swap_lock); mutex_unlock(&swapon_mutex); vfree(swap_map); @@ -2129,6 +2134,7 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) swap_list.head = swap_list.next = type; else swap_info[prev]->next = type; + trace_swap_file_open(swap_file, name); spin_unlock(&swap_lock); mutex_unlock(&swapon_mutex); atomic_inc(&proc_poll_event); |