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Commit 723cbe07 authored by Eduard - Gabriel Munteanu's avatar Eduard - Gabriel Munteanu Committed by Ingo Molnar
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kmemtrace: Remove the relay version of kmemtrace 

Impact: cleanup

kmemtrace now uses ftrace. This patch removes the relay version.
Signed-off-by: default avatarEduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent f09eac90
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kernel/trace/Kconfig
View file @ 723cbe07
...@@ -267,8 +267,6 @@ config HW_BRANCH_TRACER ...@@ -267,8 +267,6 @@ config HW_BRANCH_TRACER
config KMEMTRACE config KMEMTRACE
bool "Trace SLAB allocations" bool "Trace SLAB allocations"
select TRACING select TRACING
select MARKERS
select RELAY
help help
kmemtrace provides tracing for slab allocator functions, such as kmemtrace provides tracing for slab allocator functions, such as
kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected
......
mm/Makefile
View file @ 723cbe07
...@@ -35,4 +35,3 @@ obj-$(CONFIG_MIGRATION) += migrate.o ...@@ -35,4 +35,3 @@ obj-$(CONFIG_MIGRATION) += migrate.o
obj-$(CONFIG_SMP) += allocpercpu.o obj-$(CONFIG_SMP) += allocpercpu.o
obj-$(CONFIG_QUICKLIST) += quicklist.o obj-$(CONFIG_QUICKLIST) += quicklist.o
obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o
obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
mm/kmemtrace.c deleted 100644 → 0
View file @ f09eac90
/*
* Copyright (C) 2008 Pekka Enberg, Eduard - Gabriel Munteanu
*
* This file is released under GPL version 2.
*/
#include <linux/string.h>
#include <linux/debugfs.h>
#include <linux/relay.h>
#include <linux/module.h>
#include <linux/marker.h>
#include <linux/gfp.h>
#include <trace/kmemtrace.h>
#define KMEMTRACE_SUBBUF_SIZE 524288
#define KMEMTRACE_DEF_N_SUBBUFS 20
static struct rchan *kmemtrace_chan;
static u32 kmemtrace_buf_overruns;
static unsigned int kmemtrace_n_subbufs;
/* disabled by default */
static unsigned int kmemtrace_enabled;
/*
* The sequence number is used for reordering kmemtrace packets
* in userspace, since they are logged as per-CPU data.
*
* atomic_t should always be a 32-bit signed integer. Wraparound is not
* likely to occur, but userspace can deal with it by expecting a certain
* sequence number in the next packet that will be read.
*/
static atomic_t kmemtrace_seq_num;
#define KMEMTRACE_ABI_VERSION 1
static u32 kmemtrace_abi_version __read_mostly = KMEMTRACE_ABI_VERSION;
enum kmemtrace_event_id {
KMEMTRACE_EVENT_ALLOC = 0,
KMEMTRACE_EVENT_FREE,
};
struct kmemtrace_event {
u8 event_id;
u8 type_id;
u16 event_size;
s32 seq_num;
u64 call_site;
u64 ptr;
} __attribute__ ((__packed__));
struct kmemtrace_stats_alloc {
u64 bytes_req;
u64 bytes_alloc;
u32 gfp_flags;
s32 numa_node;
} __attribute__ ((__packed__));
static void kmemtrace_probe_alloc(void *probe_data, void *call_data,
const char *format, va_list *args)
{
unsigned long flags;
struct kmemtrace_event *ev;
struct kmemtrace_stats_alloc *stats;
void *buf;
local_irq_save(flags);
buf = relay_reserve(kmemtrace_chan,
sizeof(struct kmemtrace_event) +
sizeof(struct kmemtrace_stats_alloc));
if (!buf)
goto failed;
/*
* Don't convert this to use structure initializers,
* C99 does not guarantee the rvalues evaluation order.
*/
ev = buf;
ev->event_id = KMEMTRACE_EVENT_ALLOC;
ev->type_id = va_arg(*args, int);
ev->event_size = sizeof(struct kmemtrace_event) +
sizeof(struct kmemtrace_stats_alloc);
ev->seq_num = atomic_add_return(1, &kmemtrace_seq_num);
ev->call_site = va_arg(*args, unsigned long);
ev->ptr = va_arg(*args, unsigned long);
stats = buf + sizeof(struct kmemtrace_event);
stats->bytes_req = va_arg(*args, unsigned long);
stats->bytes_alloc = va_arg(*args, unsigned long);
stats->gfp_flags = va_arg(*args, unsigned long);
stats->numa_node = va_arg(*args, int);
failed:
local_irq_restore(flags);
}
static void kmemtrace_probe_free(void *probe_data, void *call_data,
const char *format, va_list *args)
{
unsigned long flags;
struct kmemtrace_event *ev;
local_irq_save(flags);
ev = relay_reserve(kmemtrace_chan, sizeof(struct kmemtrace_event));
if (!ev)
goto failed;
/*
* Don't convert this to use structure initializers,
* C99 does not guarantee the rvalues evaluation order.
*/
ev->event_id = KMEMTRACE_EVENT_FREE;
ev->type_id = va_arg(*args, int);
ev->event_size = sizeof(struct kmemtrace_event);
ev->seq_num = atomic_add_return(1, &kmemtrace_seq_num);
ev->call_site = va_arg(*args, unsigned long);
ev->ptr = va_arg(*args, unsigned long);
failed:
local_irq_restore(flags);
}
static struct dentry *
kmemtrace_create_buf_file(const char *filename, struct dentry *parent,
int mode, struct rchan_buf *buf, int *is_global)
{
return debugfs_create_file(filename, mode, parent, buf,
&relay_file_operations);
}
static int kmemtrace_remove_buf_file(struct dentry *dentry)
{
debugfs_remove(dentry);
return 0;
}
static int kmemtrace_subbuf_start(struct rchan_buf *buf,
void *subbuf,
void *prev_subbuf,
size_t prev_padding)
{
if (relay_buf_full(buf)) {
/*
* We know it's not SMP-safe, but neither
* debugfs_create_u32() is.
*/
kmemtrace_buf_overruns++;
return 0;
}
return 1;
}
static struct rchan_callbacks relay_callbacks = {
.create_buf_file = kmemtrace_create_buf_file,
.remove_buf_file = kmemtrace_remove_buf_file,
.subbuf_start = kmemtrace_subbuf_start,
};
static struct dentry *kmemtrace_dir;
static struct dentry *kmemtrace_overruns_dentry;
static struct dentry *kmemtrace_abi_version_dentry;
static struct dentry *kmemtrace_enabled_dentry;
static int kmemtrace_start_probes(void)
{
int err;
err = marker_probe_register("kmemtrace_alloc", "type_id %d "
"call_site %lu ptr %lu "
"bytes_req %lu bytes_alloc %lu "
"gfp_flags %lu node %d",
kmemtrace_probe_alloc, NULL);
if (err)
return err;
err = marker_probe_register("kmemtrace_free", "type_id %d "
"call_site %lu ptr %lu",
kmemtrace_probe_free, NULL);
return err;
}
static void kmemtrace_stop_probes(void)
{
marker_probe_unregister("kmemtrace_alloc",
kmemtrace_probe_alloc, NULL);
marker_probe_unregister("kmemtrace_free",
kmemtrace_probe_free, NULL);
}
static int kmemtrace_enabled_get(void *data, u64 *val)
{
*val = *((int *) data);
return 0;
}
static int kmemtrace_enabled_set(void *data, u64 val)
{
u64 old_val = kmemtrace_enabled;
*((int *) data) = !!val;
if (old_val == val)
return 0;
if (val)
kmemtrace_start_probes();
else
kmemtrace_stop_probes();
return 0;
}
DEFINE_SIMPLE_ATTRIBUTE(kmemtrace_enabled_fops,
kmemtrace_enabled_get,
kmemtrace_enabled_set, "%llu\n");
static void kmemtrace_cleanup(void)
{
if (kmemtrace_enabled_dentry)
debugfs_remove(kmemtrace_enabled_dentry);
kmemtrace_stop_probes();
if (kmemtrace_abi_version_dentry)
debugfs_remove(kmemtrace_abi_version_dentry);
if (kmemtrace_overruns_dentry)
debugfs_remove(kmemtrace_overruns_dentry);
relay_close(kmemtrace_chan);
kmemtrace_chan = NULL;
if (kmemtrace_dir)
debugfs_remove(kmemtrace_dir);
}
static int __init kmemtrace_setup_late(void)
{
if (!kmemtrace_chan)
goto failed;
kmemtrace_dir = debugfs_create_dir("kmemtrace", NULL);
if (!kmemtrace_dir)
goto cleanup;
kmemtrace_abi_version_dentry =
debugfs_create_u32("abi_version", S_IRUSR,
kmemtrace_dir, &kmemtrace_abi_version);
kmemtrace_overruns_dentry =
debugfs_create_u32("total_overruns", S_IRUSR,
kmemtrace_dir, &kmemtrace_buf_overruns);
if (!kmemtrace_overruns_dentry || !kmemtrace_abi_version_dentry)
goto cleanup;
kmemtrace_enabled_dentry =
debugfs_create_file("enabled", S_IRUSR | S_IWUSR,
kmemtrace_dir, &kmemtrace_enabled,
&kmemtrace_enabled_fops);
if (!kmemtrace_enabled_dentry)
goto cleanup;
if (relay_late_setup_files(kmemtrace_chan, "cpu", kmemtrace_dir))
goto cleanup;
printk(KERN_INFO "kmemtrace: fully up.\n");
return 0;
cleanup:
kmemtrace_cleanup();
failed:
return 1;
}
late_initcall(kmemtrace_setup_late);
static int __init kmemtrace_set_boot_enabled(char *str)
{
if (!str)
return -EINVAL;
if (!strcmp(str, "yes"))
kmemtrace_enabled = 1;
else if (!strcmp(str, "no"))
kmemtrace_enabled = 0;
else
return -EINVAL;
return 0;
}
early_param("kmemtrace.enable", kmemtrace_set_boot_enabled);
static int __init kmemtrace_set_subbufs(char *str)
{
get_option(&str, &kmemtrace_n_subbufs);
return 0;
}
early_param("kmemtrace.subbufs", kmemtrace_set_subbufs);
void kmemtrace_init(void)
{
if (!kmemtrace_n_subbufs)
kmemtrace_n_subbufs = KMEMTRACE_DEF_N_SUBBUFS;
kmemtrace_chan = relay_open(NULL, NULL, KMEMTRACE_SUBBUF_SIZE,
kmemtrace_n_subbufs, &relay_callbacks,
NULL);
if (!kmemtrace_chan) {
printk(KERN_ERR "kmemtrace: could not open relay channel.\n");
return;
}
if (!kmemtrace_enabled) {
printk(KERN_INFO "kmemtrace: disabled. Pass "
"kemtrace.enable=yes as kernel parameter for "
"boot-time tracing.\n");
return;
}
if (kmemtrace_start_probes()) {
printk(KERN_ERR "kmemtrace: could not register marker probes!\n");
kmemtrace_cleanup();
return;
}
printk(KERN_INFO "kmemtrace: enabled.\n");
}
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