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net: Temporarily backout SKB sources tracer.
Steven Rostedt has suggested that Neil work with the tracing folks, trying to use TRACE_EVENT as the mechanism for implementation. And if that doesn't workout we can investigate other solutions such as that one which was tried here. This reverts the following 2 commits:5a165657be("net: skb ftracer - Add config option to enable new ftracer (v3)")9ec04da748("net: skb ftracer - Add actual ftrace code to kernel (v3)") Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
f656f39801
commit
31ffe249e5
@ -234,17 +234,6 @@ config BOOT_TRACER
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You must pass in initcall_debug and ftrace=initcall to the kernel
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command line to enable this on bootup.
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config SKB_SOURCES_TRACER
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bool "Trace skb source information"
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depends on NET
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select GENERIC_TRACER
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help
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This tracer helps developers/sysadmins correlate skb allocation and
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consumption. The idea being that some processes will primarily consume data
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that was allocated on certain numa nodes. By being able to visualize which
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nodes the data was allocated on, a sysadmin or developer can optimize the
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scheduling of those processes to cut back on cross node chatter.
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config TRACE_BRANCH_PROFILING
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bool
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select GENERIC_TRACER
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@ -49,7 +49,6 @@ obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
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ifeq ($(CONFIG_BLOCK),y)
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obj-$(CONFIG_EVENT_TRACING) += blktrace.o
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endif
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obj-$(CONFIG_SKB_SOURCES_TRACER) += trace_skb_sources.o
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obj-$(CONFIG_EVENT_TRACING) += trace_events.o
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obj-$(CONFIG_EVENT_TRACING) += trace_export.o
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obj-$(CONFIG_FTRACE_SYSCALLS) += trace_syscalls.o
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@ -11,7 +11,6 @@
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#include <trace/boot.h>
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#include <linux/kmemtrace.h>
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#include <trace/power.h>
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#include <trace/events/skb.h>
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#include <linux/trace_seq.h>
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#include <linux/ftrace_event.h>
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@ -41,7 +40,6 @@ enum trace_type {
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TRACE_KMEM_FREE,
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TRACE_POWER,
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TRACE_BLK,
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TRACE_SKB_SOURCE,
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__TRACE_LAST_TYPE,
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};
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@ -173,21 +171,6 @@ struct trace_power {
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struct power_trace state_data;
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};
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struct skb_record {
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pid_t pid; /* pid of the copying process */
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int anid; /* node where skb was allocated */
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int cnid; /* node to which skb was copied in userspace */
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char ifname[IFNAMSIZ]; /* Name of the receiving interface */
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int rx_queue; /* The rx queue the skb was received on */
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int ccpu; /* Cpu the application got this frame from */
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int len; /* length of the data copied */
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};
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struct trace_skb_event {
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struct trace_entry ent;
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struct skb_record event_data;
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};
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enum kmemtrace_type_id {
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KMEMTRACE_TYPE_KMALLOC = 0, /* kmalloc() or kfree(). */
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KMEMTRACE_TYPE_CACHE, /* kmem_cache_*(). */
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@ -340,8 +323,6 @@ extern void __ftrace_bad_type(void);
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TRACE_SYSCALL_ENTER); \
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IF_ASSIGN(var, ent, struct syscall_trace_exit, \
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TRACE_SYSCALL_EXIT); \
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IF_ASSIGN(var, ent, struct trace_skb_event, \
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TRACE_SKB_SOURCE); \
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__ftrace_bad_type(); \
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} while (0)
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@ -1,154 +0,0 @@
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/*
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* ring buffer based tracer for analyzing per-socket skb sources
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*
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* Neil Horman <nhorman@tuxdriver.com>
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* Copyright (C) 2009
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*
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*
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*/
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#include <linux/init.h>
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#include <linux/debugfs.h>
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#include <trace/events/skb.h>
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#include <linux/kallsyms.h>
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#include <linux/module.h>
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#include <linux/hardirq.h>
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#include <linux/netdevice.h>
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#include <net/sock.h>
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#include "trace.h"
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#include "trace_output.h"
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EXPORT_TRACEPOINT_SYMBOL_GPL(skb_copy_datagram_iovec);
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static struct trace_array *skb_trace;
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static int __read_mostly trace_skb_source_enabled;
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static void probe_skb_dequeue(const struct sk_buff *skb, int len)
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{
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struct ring_buffer_event *event;
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struct trace_skb_event *entry;
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struct trace_array *tr = skb_trace;
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struct net_device *dev;
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if (!trace_skb_source_enabled)
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return;
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if (in_interrupt())
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return;
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event = trace_buffer_lock_reserve(tr, TRACE_SKB_SOURCE,
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sizeof(*entry), 0, 0);
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if (!event)
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return;
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entry = ring_buffer_event_data(event);
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entry->event_data.pid = current->pid;
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entry->event_data.anid = page_to_nid(virt_to_page(skb->data));
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entry->event_data.cnid = cpu_to_node(smp_processor_id());
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entry->event_data.len = len;
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entry->event_data.rx_queue = skb->queue_mapping;
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entry->event_data.ccpu = smp_processor_id();
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dev = dev_get_by_index(sock_net(skb->sk), skb->iif);
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if (dev) {
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memcpy(entry->event_data.ifname, dev->name, IFNAMSIZ);
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dev_put(dev);
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} else {
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strcpy(entry->event_data.ifname, "Unknown");
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}
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trace_buffer_unlock_commit(tr, event, 0, 0);
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}
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static int tracing_skb_source_register(void)
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{
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int ret;
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ret = register_trace_skb_copy_datagram_iovec(probe_skb_dequeue);
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if (ret)
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pr_info("skb source trace: Couldn't activate dequeue tracepoint");
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return ret;
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}
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static void start_skb_source_trace(struct trace_array *tr)
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{
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trace_skb_source_enabled = 1;
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}
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static void stop_skb_source_trace(struct trace_array *tr)
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{
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trace_skb_source_enabled = 0;
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}
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static void skb_source_trace_reset(struct trace_array *tr)
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{
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trace_skb_source_enabled = 0;
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unregister_trace_skb_copy_datagram_iovec(probe_skb_dequeue);
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}
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static int skb_source_trace_init(struct trace_array *tr)
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{
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int cpu;
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skb_trace = tr;
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trace_skb_source_enabled = 1;
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tracing_skb_source_register();
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for_each_cpu(cpu, cpu_possible_mask)
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tracing_reset(tr, cpu);
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return 0;
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}
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static enum print_line_t skb_source_print_line(struct trace_iterator *iter)
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{
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int ret = 0;
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struct trace_entry *entry = iter->ent;
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struct trace_skb_event *event;
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struct skb_record *record;
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struct trace_seq *s = &iter->seq;
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trace_assign_type(event, entry);
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record = &event->event_data;
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if (entry->type != TRACE_SKB_SOURCE)
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return TRACE_TYPE_UNHANDLED;
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ret = trace_seq_printf(s, " %d %d %d %s %d %d %d\n",
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record->pid,
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record->anid,
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record->cnid,
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record->ifname,
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record->rx_queue,
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record->ccpu,
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record->len);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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return TRACE_TYPE_HANDLED;
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}
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static void skb_source_print_header(struct seq_file *s)
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{
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seq_puts(s, "# PID ANID CNID IFC RXQ CCPU LEN\n");
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seq_puts(s, "# | | | | | | |\n");
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}
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static struct tracer skb_source_tracer __read_mostly =
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{
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.name = "skb_sources",
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.init = skb_source_trace_init,
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.start = start_skb_source_trace,
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.stop = stop_skb_source_trace,
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.reset = skb_source_trace_reset,
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.print_line = skb_source_print_line,
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.print_header = skb_source_print_header,
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};
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static int init_skb_source_trace(void)
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{
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return register_tracer(&skb_source_tracer);
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}
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device_initcall(init_skb_source_trace);
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