From: Tom Zanussi <tom.zanussi@linux.intel.com>
To: rostedt@goodmis.org
Cc: daniel.wagner@bmw-carit.de, masami.hiramatsu.pt@hitachi.com,
namhyung@kernel.org, josh@joshtriplett.org, andi@firstfloor.org,
mathieu.desnoyers@efficios.com, peterz@infradead.org,
linux-kernel@vger.kernel.org,
Tom Zanussi <tom.zanussi@linux.intel.com>
Subject: [PATCH v12 27/30] tracing: Add support for named hist triggers
Date: Mon, 23 Nov 2015 13:51:42 -0600 [thread overview]
Message-ID: <5e6319a694f8d29af8417bcc12e1e2d49b6898b0.1448303214.git.tom.zanussi@linux.intel.com> (raw)
In-Reply-To: <cover.1448303214.git.tom.zanussi@linux.intel.com>
In-Reply-To: <cover.1448303214.git.tom.zanussi@linux.intel.com>
Allow users to define 'named' hist triggers. All triggers created
with the same 'name=xxx' option will update the same shared histogram
data.
This expands the hist trigger syntax from this:
# echo hist:keys=xxx ... [ if filter] > event/trigger
to this:
# echo hist:name=xxx:keys=xxx ... [ if filter] > event/trigger
Named histograms must use a 'compatible' set of keys and values, which
means each event added to a set of named triggers must have the same
names and types.
Reading the 'hist' file of any of the participating events will
produce the same output as any other participating event, which is to
be expected since they share the same data.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
---
Documentation/trace/events.txt | 274 +++++++++++++++++++++++++++++++++++++--
kernel/trace/trace.c | 14 +-
kernel/trace/trace_events_hist.c | 148 ++++++++++++++++++---
3 files changed, 407 insertions(+), 29 deletions(-)
diff --git a/Documentation/trace/events.txt b/Documentation/trace/events.txt
index cc02167..08d74d7 100644
--- a/Documentation/trace/events.txt
+++ b/Documentation/trace/events.txt
@@ -524,7 +524,7 @@ The following commands are supported:
hist:keys=<field1[,field2,...]>[:values=<field1[,field2,...]>]
[:sort=<field1[,field2,...]>][:size=#entries][:pause][:continue]
- [:clear] [if <filter>]
+ [:clear][:name=histname1] [if <filter>]
When a matching event is hit, an entry is added to a hash table
using the key(s) and value(s) named. Keys and values correspond to
@@ -546,18 +546,28 @@ The following commands are supported:
specified by the 'sort' keyword. If more than one field is
specified, the result will be a 'sort within a sort': the first key
is taken to be the primary sort key and the second the secondary
- key.
+ key. If a hist trigger is given a name using the 'name' parameter,
+ its histogram data will be shared with other triggers of the same
+ name, and trigger hits will update this common data. Only triggers
+ with 'compatible' fields can be combined in this way; triggers are
+ 'compatible' if the fields named in the trigger share the same
+ number and type of fields and those fields also have the same names.
+ Note that any two events always share the compatible 'hitcount' and
+ 'stacktrace' fields and can therefore be combined using those
+ fields, however pointless that may be.
'hist' triggers add a 'hist' file to each event's subdirectory.
Reading the 'hist' file for the event will dump the hash table in
its entirety to stdout. If there are multiple hist triggers
attached to an event, there will be a table for each trigger in the
- output. Each printed hash table entry is a simple list of the keys
- and values comprising the entry; keys are printed first and are
- delineated by curly braces, and are followed by the set of value
- fields for the entry. By default, numeric fields are displayed as
- base-10 integers. This can be modified by appending any of the
- following modifiers to the field name:
+ output. The table displayed for a named trigger will be the same as
+ any other instance having the same name. Each printed hash table
+ entry is a simple list of the keys and values comprising the entry;
+ keys are printed first and are delineated by curly braces, and are
+ followed by the set of value fields for the entry. By default,
+ numeric fields are displayed as base-10 integers. This can be
+ modified by appending any of the following modifiers to the field
+ name:
.hex display a number as a hex value
.sym display an address as a symbol
@@ -1809,3 +1819,251 @@ The following commands are supported:
Hits: 0
Entries: 0
Dropped: 0
+
+ Named triggers can be used to have triggers share a common set of
+ histogram data. This capability is mostly useful for combining the
+ output of events generated by tracepoints contained inside inline
+ functions, but names can be used in a hist trigger on any event.
+ For example, these two triggers when hit will update the same 'len'
+ field in the shared 'foo' histogram data:
+
+ # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \
+ /sys/kernel/debug/tracing/events/net/netif_receive_skb/trigger
+ # echo 'hist:name=foo:keys=skbaddr.hex:vals=len' > \
+ /sys/kernel/debug/tracing/events/net/netif_rx/trigger
+
+ You can see that they're updating common histogram data by reading
+ each event's hist files at the same time:
+
+ # cat /sys/kernel/debug/tracing/events/net/netif_receive_skb/hist;
+ cat /sys/kernel/debug/tracing/events/net/netif_rx/hist
+
+ # event histogram
+ #
+ # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active]
+ #
+
+ { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46
+ { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76
+ { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468
+ { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46
+ { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52
+ { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168
+ { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260
+ { skbaddr: ffff880064505000 } hitcount: 1 len: 46
+ { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32
+ { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44
+ { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168
+ { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40
+ { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40
+ { skbaddr: ffff880064505f00 } hitcount: 1 len: 174
+ { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160
+ { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76
+ { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32
+ { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988
+ { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46
+ { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44
+ { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676
+ { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107
+ { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92
+ { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142
+ { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220
+ { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92
+ { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92
+ { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675
+ { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138
+ { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138
+ { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184
+ { skbaddr: ffff880064504400 } hitcount: 4 len: 184
+ { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184
+ { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230
+ { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196
+ { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276
+ { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276
+
+ Totals:
+ Hits: 81
+ Entries: 42
+ Dropped: 0
+ # event histogram
+ #
+ # trigger info: hist:name=foo:keys=skbaddr.hex:vals=hitcount,len:sort=hitcount:size=2048 [active]
+ #
+
+ { skbaddr: ffff88000ad53500 } hitcount: 1 len: 46
+ { skbaddr: ffff8800af5a1500 } hitcount: 1 len: 76
+ { skbaddr: ffff8800d62a1900 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bccb00 } hitcount: 1 len: 468
+ { skbaddr: ffff8800d3c69900 } hitcount: 1 len: 46
+ { skbaddr: ffff88009ff09100 } hitcount: 1 len: 52
+ { skbaddr: ffff88010f13ab00 } hitcount: 1 len: 168
+ { skbaddr: ffff88006a54f400 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcc500 } hitcount: 1 len: 260
+ { skbaddr: ffff880064505000 } hitcount: 1 len: 46
+ { skbaddr: ffff8800baf24e00 } hitcount: 1 len: 32
+ { skbaddr: ffff88009fe0ad00 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d3edff00 } hitcount: 1 len: 44
+ { skbaddr: ffff88009fe0b400 } hitcount: 1 len: 168
+ { skbaddr: ffff8800a1c55a00 } hitcount: 1 len: 40
+ { skbaddr: ffff8800d2bcd100 } hitcount: 1 len: 40
+ { skbaddr: ffff880064505f00 } hitcount: 1 len: 174
+ { skbaddr: ffff8800a8bff200 } hitcount: 1 len: 160
+ { skbaddr: ffff880044e3cc00 } hitcount: 1 len: 76
+ { skbaddr: ffff8800a8bfe700 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcdc00 } hitcount: 1 len: 32
+ { skbaddr: ffff8800a1f64800 } hitcount: 1 len: 46
+ { skbaddr: ffff8800d2bcde00 } hitcount: 1 len: 988
+ { skbaddr: ffff88006a5dea00 } hitcount: 1 len: 46
+ { skbaddr: ffff88002e37a200 } hitcount: 1 len: 44
+ { skbaddr: ffff8800a1f32c00 } hitcount: 2 len: 676
+ { skbaddr: ffff88000ad52600 } hitcount: 2 len: 107
+ { skbaddr: ffff8800a1f91e00 } hitcount: 2 len: 92
+ { skbaddr: ffff8800af5a0200 } hitcount: 2 len: 142
+ { skbaddr: ffff8800d2bcc600 } hitcount: 2 len: 220
+ { skbaddr: ffff8800ba36f500 } hitcount: 2 len: 92
+ { skbaddr: ffff8800d021f800 } hitcount: 2 len: 92
+ { skbaddr: ffff8800a1f33600 } hitcount: 2 len: 675
+ { skbaddr: ffff8800a8bfff00 } hitcount: 3 len: 138
+ { skbaddr: ffff8800d62a1300 } hitcount: 3 len: 138
+ { skbaddr: ffff88002e37a100 } hitcount: 4 len: 184
+ { skbaddr: ffff880064504400 } hitcount: 4 len: 184
+ { skbaddr: ffff8800a8bfec00 } hitcount: 4 len: 184
+ { skbaddr: ffff88000ad53700 } hitcount: 5 len: 230
+ { skbaddr: ffff8800d2bcdb00 } hitcount: 5 len: 196
+ { skbaddr: ffff8800a1f90000 } hitcount: 6 len: 276
+ { skbaddr: ffff88006a54f900 } hitcount: 6 len: 276
+
+ Totals:
+ Hits: 81
+ Entries: 42
+ Dropped: 0
+
+ And here's an example that shows how to combine histogram data from
+ any two events even if they don't share any 'compatible' fields
+ other than 'hitcount' and 'stacktrace'. These commands create a
+ couple of triggers named 'bar' using those fields:
+
+ # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \
+ /sys/kernel/debug/tracing/events/sched/sched_process_fork/trigger
+ # echo 'hist:name=bar:key=stacktrace:val=hitcount' > \
+ /sys/kernel/debug/tracing/events/net/netif_rx/trigger
+
+ And displaying the output of either shows some interesting if
+ somewhat confusing output:
+
+ # cat /sys/kernel/debug/tracing/events/sched/sched_process_fork/hist
+ # cat /sys/kernel/debug/tracing/events/net/netif_rx/hist
+
+ # event histogram
+ #
+ # trigger info: hist:name=bar:keys=stacktrace:vals=hitcount:sort=hitcount:size=2048 [active]
+ #
+
+ { stacktrace:
+ _do_fork+0x18e/0x330
+ kernel_thread+0x29/0x30
+ kthreadd+0x154/0x1b0
+ ret_from_fork+0x3f/0x70
+ } hitcount: 1
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx_ni+0x20/0x70
+ dev_loopback_xmit+0xaa/0xd0
+ ip_mc_output+0x126/0x240
+ ip_local_out_sk+0x31/0x40
+ igmp_send_report+0x1e9/0x230
+ igmp_timer_expire+0xe9/0x120
+ call_timer_fn+0x39/0xf0
+ run_timer_softirq+0x1e1/0x290
+ __do_softirq+0xfd/0x290
+ irq_exit+0x98/0xb0
+ smp_apic_timer_interrupt+0x4a/0x60
+ apic_timer_interrupt+0x6d/0x80
+ cpuidle_enter+0x17/0x20
+ call_cpuidle+0x3b/0x60
+ cpu_startup_entry+0x22d/0x310
+ } hitcount: 1
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx_ni+0x20/0x70
+ dev_loopback_xmit+0xaa/0xd0
+ ip_mc_output+0x17f/0x240
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x13e/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ SYSC_sendto+0xef/0x170
+ SyS_sendto+0xe/0x10
+ entry_SYSCALL_64_fastpath+0x12/0x6a
+ } hitcount: 2
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx+0x1c/0x60
+ loopback_xmit+0x6c/0xb0
+ dev_hard_start_xmit+0x219/0x3a0
+ __dev_queue_xmit+0x415/0x4f0
+ dev_queue_xmit_sk+0x13/0x20
+ ip_finish_output2+0x237/0x340
+ ip_finish_output+0x113/0x1d0
+ ip_output+0x66/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x16d/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ ___sys_sendmsg+0x14e/0x270
+ } hitcount: 76
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx+0x1c/0x60
+ loopback_xmit+0x6c/0xb0
+ dev_hard_start_xmit+0x219/0x3a0
+ __dev_queue_xmit+0x415/0x4f0
+ dev_queue_xmit_sk+0x13/0x20
+ ip_finish_output2+0x237/0x340
+ ip_finish_output+0x113/0x1d0
+ ip_output+0x66/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x16d/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ ___sys_sendmsg+0x269/0x270
+ } hitcount: 77
+ { stacktrace:
+ netif_rx_internal+0xb2/0xd0
+ netif_rx+0x1c/0x60
+ loopback_xmit+0x6c/0xb0
+ dev_hard_start_xmit+0x219/0x3a0
+ __dev_queue_xmit+0x415/0x4f0
+ dev_queue_xmit_sk+0x13/0x20
+ ip_finish_output2+0x237/0x340
+ ip_finish_output+0x113/0x1d0
+ ip_output+0x66/0xc0
+ ip_local_out_sk+0x31/0x40
+ ip_send_skb+0x1a/0x50
+ udp_send_skb+0x16d/0x270
+ udp_sendmsg+0x2bf/0x980
+ inet_sendmsg+0x67/0xa0
+ sock_sendmsg+0x38/0x50
+ SYSC_sendto+0xef/0x170
+ } hitcount: 88
+ { stacktrace:
+ _do_fork+0x18e/0x330
+ SyS_clone+0x19/0x20
+ entry_SYSCALL_64_fastpath+0x12/0x6a
+ } hitcount: 244
+
+ Totals:
+ Hits: 489
+ Entries: 7
+ Dropped: 0
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index f1ec156..75b612c 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -3833,6 +3833,7 @@ static const char readme_msg[] =
"\t [:sort=<field1[,field2,...]>]\n"
"\t [:size=#entries]\n"
"\t [:pause][:continue][:clear]\n"
+ "\t [:name=histname1]\n"
"\t [if <filter>]\n\n"
"\t When a matching event is hit, an entry is added to a hash\n"
"\t table using the key(s) and value(s) named, and the value of a\n"
@@ -3845,13 +3846,18 @@ static const char readme_msg[] =
"\t specified using the 'sort' keyword. The sort direction can\n"
"\t be modified by appending '.descending' or '.ascending' to a\n"
"\t sort field. The 'size' parameter can be used to specify more\n"
- "\t or fewer than the default 2048 entries for the hashtable size.\n\n"
+ "\t or fewer than the default 2048 entries for the hashtable size.\n"
+ "\t If a hist trigger is given a name using the 'name' parameter,\n"
+ "\t its histogram data will be shared with other triggers of the\n"
+ "\t same name, and trigger hits will update this common data.\n\n"
"\t Reading the 'hist' file for the event will dump the hash\n"
"\t table in its entirety to stdout. If there are multiple hist\n"
"\t triggers attached to an event, there will be a table for each\n"
- "\t trigger in the output. The default format used to display a\n"
- "\t given field can be modified by appending any of the following\n"
- "\t modifiers to the field name, as applicable:\n\n"
+ "\t trigger in the output. The table displayed for a named\n"
+ "\t trigger will be the same as any other instance having the\n"
+ "\t same name. The default format used to display a given field\n"
+ "\t can be modified by appending any of the following modifiers\n"
+ "\t to the field name, as applicable:\n\n"
"\t .hex display a number as a hex value\n"
"\t .sym display an address as a symbol\n"
"\t .sym-offset display an address as a symbol and offset\n"
diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 424f5c2..1338da2 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -118,6 +118,7 @@ struct hist_trigger_attrs {
char *keys_str;
char *vals_str;
char *sort_key_str;
+ char *name;
bool pause;
bool cont;
bool clear;
@@ -201,6 +202,7 @@ static void destroy_hist_trigger_attrs(struct hist_trigger_attrs *attrs)
if (!attrs)
return;
+ kfree(attrs->name);
kfree(attrs->sort_key_str);
kfree(attrs->keys_str);
kfree(attrs->vals_str);
@@ -228,6 +230,8 @@ static struct hist_trigger_attrs *parse_hist_trigger_attrs(char *trigger_str)
attrs->vals_str = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "sort", strlen("sort")))
attrs->sort_key_str = kstrdup(str, GFP_KERNEL);
+ else if (!strncmp(str, "name", strlen("name")))
+ attrs->name = kstrdup(str, GFP_KERNEL);
else if (!strncmp(str, "pause", strlen("pause")))
attrs->pause = true;
else if (!strncmp(str, "clear", strlen("clear")))
@@ -1113,7 +1117,12 @@ static int event_hist_trigger_print(struct seq_file *m,
struct hist_field *key_field;
unsigned int i;
- seq_puts(m, "hist:keys=");
+ seq_puts(m, "hist:");
+
+ if (data->name)
+ seq_printf(m, "%s:", data->name);
+
+ seq_puts(m, "keys=");
for_each_hist_key_field(i, hist_data) {
key_field = hist_data->fields[i];
@@ -1175,6 +1184,19 @@ static int event_hist_trigger_print(struct seq_file *m,
return 0;
}
+static int event_hist_trigger_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ struct hist_trigger_data *hist_data = data->private_data;
+
+ if (!data->ref && hist_data->attrs->name)
+ save_named_trigger(hist_data->attrs->name, data);
+
+ data->ref++;
+
+ return 0;
+}
+
static void event_hist_trigger_free(struct event_trigger_ops *ops,
struct event_trigger_data *data)
{
@@ -1185,6 +1207,8 @@ static void event_hist_trigger_free(struct event_trigger_ops *ops,
data->ref--;
if (!data->ref) {
+ if (data->name)
+ del_named_trigger(data);
trigger_data_free(data);
destroy_hist_data(hist_data);
}
@@ -1193,10 +1217,44 @@ static void event_hist_trigger_free(struct event_trigger_ops *ops,
static struct event_trigger_ops event_hist_trigger_ops = {
.func = event_hist_trigger,
.print = event_hist_trigger_print,
- .init = event_trigger_init,
+ .init = event_hist_trigger_init,
.free = event_hist_trigger_free,
};
+static int event_hist_trigger_named_init(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ data->ref++;
+
+ save_named_trigger(data->named_data->name, data);
+
+ event_hist_trigger_init(ops, data->named_data);
+
+ return 0;
+}
+
+static void event_hist_trigger_named_free(struct event_trigger_ops *ops,
+ struct event_trigger_data *data)
+{
+ if (WARN_ON_ONCE(data->ref <= 0))
+ return;
+
+ event_hist_trigger_free(ops, data->named_data);
+
+ data->ref--;
+ if (!data->ref) {
+ del_named_trigger(data);
+ trigger_data_free(data);
+ }
+}
+
+static struct event_trigger_ops event_hist_trigger_named_ops = {
+ .func = event_hist_trigger,
+ .print = event_hist_trigger_print,
+ .init = event_hist_trigger_named_init,
+ .free = event_hist_trigger_named_free,
+};
+
static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
char *param)
{
@@ -1206,26 +1264,54 @@ static struct event_trigger_ops *event_hist_get_trigger_ops(char *cmd,
static void hist_clear(struct event_trigger_data *data)
{
struct hist_trigger_data *hist_data = data->private_data;
- bool paused;
- paused = data->paused;
- data->paused = true;
+ if (data->name)
+ pause_named_trigger(data);
synchronize_sched();
tracing_map_clear(hist_data->map);
- data->paused = paused;
+ if (data->name)
+ unpause_named_trigger(data);
+}
+
+static bool compatible_field(struct ftrace_event_field *field,
+ struct ftrace_event_field *test_field)
+{
+ if (field == test_field)
+ return true;
+ if (field == NULL || test_field == NULL)
+ return false;
+ if (strcmp(field->name, test_field->name))
+ return false;
+ if (strcmp(field->type, test_field->type))
+ return false;
+ if (field->size != test_field->size)
+ return false;
+ if (field->is_signed != test_field->is_signed)
+ return false;
+
+ return true;
}
static bool hist_trigger_match(struct event_trigger_data *data,
- struct event_trigger_data *data_test)
+ struct event_trigger_data *data_test,
+ struct event_trigger_data *named_data,
+ bool ignore_filter)
{
struct tracing_map_sort_key *sort_key, *sort_key_test;
struct hist_trigger_data *hist_data, *hist_data_test;
struct hist_field *key_field, *key_field_test;
unsigned int i;
+ if (named_data && (named_data != data_test) &&
+ (named_data != data_test->named_data))
+ return false;
+
+ if (!named_data && is_named_trigger(data_test))
+ return false;
+
hist_data = data->private_data;
hist_data_test = data_test->private_data;
@@ -1234,9 +1320,11 @@ static bool hist_trigger_match(struct event_trigger_data *data,
hist_data->n_sort_keys != hist_data_test->n_sort_keys)
return false;
- if ((data->filter_str && !data_test->filter_str) ||
- (!data->filter_str && data_test->filter_str))
- return false;
+ if (!ignore_filter) {
+ if ((data->filter_str && !data_test->filter_str) ||
+ (!data->filter_str && data_test->filter_str))
+ return false;
+ }
for_each_hist_field(i, hist_data) {
key_field = hist_data->fields[i];
@@ -1244,7 +1332,7 @@ static bool hist_trigger_match(struct event_trigger_data *data,
if (key_field->flags != key_field_test->flags)
return false;
- if (key_field->field != key_field_test->field)
+ if (!compatible_field(key_field->field, key_field_test->field))
return false;
if (key_field->offset != key_field_test->offset)
return false;
@@ -1259,7 +1347,7 @@ static bool hist_trigger_match(struct event_trigger_data *data,
return false;
}
- if (data->filter_str &&
+ if (!ignore_filter && data->filter_str &&
strcmp(data->filter_str, data_test->filter_str))
return false;
@@ -1271,12 +1359,26 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
struct trace_event_file *file)
{
struct hist_trigger_data *hist_data = data->private_data;
- struct event_trigger_data *test;
+ struct event_trigger_data *test, *named_data = NULL;
int ret = 0;
+ if (hist_data->attrs->name) {
+ named_data = find_named_trigger(hist_data->attrs->name);
+ if (named_data) {
+ if (!hist_trigger_match(data, named_data, named_data,
+ true)) {
+ ret = -EINVAL;
+ goto out;
+ }
+ }
+ }
+
+ if (hist_data->attrs->name && !named_data)
+ goto new;
+
list_for_each_entry_rcu(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (!hist_trigger_match(data, test))
+ if (!hist_trigger_match(data, test, named_data, false))
continue;
if (hist_data->attrs->pause)
test->paused = true;
@@ -1289,12 +1391,19 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
goto out;
}
}
-
+ new:
if (hist_data->attrs->cont || hist_data->attrs->clear) {
ret = -ENOENT;
goto out;
}
+ if (named_data) {
+ destroy_hist_data(data->private_data);
+ data->private_data = named_data->private_data;
+ set_named_trigger_data(data, named_data);
+ data->ops = &event_hist_trigger_named_ops;
+ }
+
if (hist_data->attrs->pause)
data->paused = true;
@@ -1308,6 +1417,7 @@ static int hist_register_trigger(char *glob, struct event_trigger_ops *ops,
ret++;
update_cond_flag(file);
+
if (trace_event_trigger_enable_disable(file, 1) < 0) {
list_del_rcu(&data->list);
update_cond_flag(file);
@@ -1321,12 +1431,16 @@ static void hist_unregister_trigger(char *glob, struct event_trigger_ops *ops,
struct event_trigger_data *data,
struct trace_event_file *file)
{
- struct event_trigger_data *test;
+ struct hist_trigger_data *hist_data = data->private_data;
+ struct event_trigger_data *test, *named_data = NULL;
bool unregistered = false;
+ if (hist_data->attrs->name)
+ named_data = find_named_trigger(hist_data->attrs->name);
+
list_for_each_entry_rcu(test, &file->triggers, list) {
if (test->cmd_ops->trigger_type == ETT_EVENT_HIST) {
- if (!hist_trigger_match(data, test))
+ if (!hist_trigger_match(data, test, named_data, false))
continue;
unregistered = true;
list_del_rcu(&test->list);
--
1.9.3
next prev parent reply other threads:[~2015-11-23 19:52 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-11-23 19:51 [PATCH 00/30] tracing: 'hist' triggers Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 01/30] tracing: Update cond flag when enabling or disabling a trigger Tom Zanussi
2015-11-23 21:29 ` Steven Rostedt
2015-11-25 1:27 ` Namhyung Kim
2015-11-23 19:51 ` [PATCH v12 02/30] tracing: Make ftrace_event_field checking functions available Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 03/30] tracing: Make event trigger " Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 04/30] tracing: Add event record param to trigger_ops.func() Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 05/30] tracing: Add get_syscall_name() Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 06/30] tracing: Add a per-event-trigger 'paused' field Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 07/30] tracing: Add needs_rec flag to event triggers Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 08/30] tracing: Add an unreg_all() callback to trigger commands Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 09/30] tracing: Add lock-free tracing_map Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 10/30] tracing: Add 'hist' event trigger command Tom Zanussi
2015-11-29 14:54 ` Namhyung Kim
2015-11-23 19:51 ` [PATCH v12 11/30] tracing: Add hist trigger support for multiple values ('vals=' param) Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 12/30] tracing: Add hist trigger support for compound keys Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 13/30] tracing: Add hist trigger support for user-defined sorting ('sort=' param) Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 14/30] tracing: Add hist trigger support for pausing and continuing a trace Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 15/30] tracing: Add hist trigger support for clearing " Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 16/30] tracing: Add hist trigger 'hex' modifier for displaying numeric fields Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 17/30] tracing: Add hist trigger 'sym' and 'sym-offset' modifiers Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 18/30] tracing: Add hist trigger 'execname' modifier Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 19/30] tracing: Add hist trigger 'syscall' modifier Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 20/30] tracing: Add hist trigger support for stacktraces as keys Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 21/30] tracing: Support string type key properly Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 22/30] tracing: Remove restriction on string position in hist trigger keys Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 23/30] tracing: Add enable_hist/disable_hist triggers Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 24/30] tracing: Add 'hist' trigger Documentation Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 25/30] tracing: Add support for multiple hist triggers per event Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 26/30] tracing: Add support for named triggers Tom Zanussi
2015-11-23 19:51 ` Tom Zanussi [this message]
2015-11-23 19:51 ` [PATCH v12 28/30] kselftests/ftrace : Add event trigger testcases Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 29/30] kselftests/ftrace: Add hist " Tom Zanussi
2015-11-23 19:51 ` [PATCH v12 30/30] tracing: Add hist trigger 'log2' modifier Tom Zanussi
2015-11-29 15:22 ` [PATCH 00/30] tracing: 'hist' triggers Namhyung Kim
2015-12-10 18:54 ` Tom Zanussi
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