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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-12-05 09:44:31 +0100 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2009-12-06 08:27:18 +0100 |
| commit | b326e9560a28fc3e950637ef51847ed8f05c1335 (patch) | |
| tree | 0804c8c4f28d4ae152d5e9205ce5a958f0d26b79 /samples/hw_breakpoint | |
| parent | 2f0993e0fb663c49e4d1e02654f6203246be4817 (diff) | |
| download | linux-b326e9560a28fc3e950637ef51847ed8f05c1335.tar.gz linux-b326e9560a28fc3e950637ef51847ed8f05c1335.tar.bz2 linux-b326e9560a28fc3e950637ef51847ed8f05c1335.zip | |
hw-breakpoints: Use overflow handler instead of the event callback
struct perf_event::event callback was called when a breakpoint
triggers. But this is a rather opaque callback, pretty
tied-only to the breakpoint API and not really integrated into perf
as it triggers even when we don't overflow.
We prefer to use overflow_handler() as it fits into the perf events
rules, being called only when we overflow.
Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: "K. Prasad" <prasad@linux.vnet.ibm.com>
Diffstat (limited to 'samples/hw_breakpoint')
| -rw-r--r-- | samples/hw_breakpoint/data_breakpoint.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/samples/hw_breakpoint/data_breakpoint.c b/samples/hw_breakpoint/data_breakpoint.c index 29525500df00..c69cbe9b2426 100644 --- a/samples/hw_breakpoint/data_breakpoint.c +++ b/samples/hw_breakpoint/data_breakpoint.c @@ -41,7 +41,9 @@ module_param_string(ksym, ksym_name, KSYM_NAME_LEN, S_IRUGO); MODULE_PARM_DESC(ksym, "Kernel symbol to monitor; this module will report any" " write operations on the kernel symbol"); -static void sample_hbp_handler(struct perf_event *temp, void *data) +static void sample_hbp_handler(struct perf_event *bp, int nmi, + struct perf_sample_data *data, + struct pt_regs *regs) { printk(KERN_INFO "%s value is changed\n", ksym_name); dump_stack(); @@ -51,8 +53,9 @@ static void sample_hbp_handler(struct perf_event *temp, void *data) static int __init hw_break_module_init(void) { int ret; - DEFINE_BREAKPOINT_ATTR(attr); + struct perf_event_attr attr; + hw_breakpoint_init(&attr); attr.bp_addr = kallsyms_lookup_name(ksym_name); attr.bp_len = HW_BREAKPOINT_LEN_4; attr.bp_type = HW_BREAKPOINT_W | HW_BREAKPOINT_R; |