469 lines
11 KiB
C
469 lines
11 KiB
C
/*
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* Memory allocator tracing
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*
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* Copyright (C) 2008 Eduard - Gabriel Munteanu
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* Copyright (C) 2008 Pekka Enberg <penberg@cs.helsinki.fi>
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* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
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*/
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#include <linux/tracepoint.h>
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#include <linux/seq_file.h>
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#include <linux/debugfs.h>
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#include <linux/dcache.h>
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#include <linux/fs.h>
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#include <linux/kmemtrace.h>
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#include "trace_output.h"
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#include "trace.h"
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/* Select an alternative, minimalistic output than the original one */
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#define TRACE_KMEM_OPT_MINIMAL 0x1
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static struct tracer_opt kmem_opts[] = {
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/* Default disable the minimalistic output */
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{ TRACER_OPT(kmem_minimalistic, TRACE_KMEM_OPT_MINIMAL) },
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{ }
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};
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static struct tracer_flags kmem_tracer_flags = {
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.val = 0,
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.opts = kmem_opts
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};
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static struct trace_array *kmemtrace_array;
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/* Trace allocations */
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static inline void kmemtrace_alloc(enum kmemtrace_type_id type_id,
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unsigned long call_site,
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const void *ptr,
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size_t bytes_req,
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size_t bytes_alloc,
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gfp_t gfp_flags,
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int node)
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{
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struct ftrace_event_call *call = &event_kmem_alloc;
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struct trace_array *tr = kmemtrace_array;
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struct kmemtrace_alloc_entry *entry;
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struct ring_buffer_event *event;
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event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
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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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tracing_generic_entry_update(&entry->ent, 0, 0);
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entry->ent.type = TRACE_KMEM_ALLOC;
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entry->type_id = type_id;
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entry->call_site = call_site;
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entry->ptr = ptr;
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entry->bytes_req = bytes_req;
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entry->bytes_alloc = bytes_alloc;
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entry->gfp_flags = gfp_flags;
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entry->node = node;
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if (!filter_check_discard(call, entry, tr->buffer, event))
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ring_buffer_unlock_commit(tr->buffer, event);
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trace_wake_up();
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}
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static inline void kmemtrace_free(enum kmemtrace_type_id type_id,
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unsigned long call_site,
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const void *ptr)
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{
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struct ftrace_event_call *call = &event_kmem_free;
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struct trace_array *tr = kmemtrace_array;
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struct kmemtrace_free_entry *entry;
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struct ring_buffer_event *event;
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event = ring_buffer_lock_reserve(tr->buffer, sizeof(*entry));
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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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tracing_generic_entry_update(&entry->ent, 0, 0);
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entry->ent.type = TRACE_KMEM_FREE;
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entry->type_id = type_id;
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entry->call_site = call_site;
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entry->ptr = ptr;
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if (!filter_check_discard(call, entry, tr->buffer, event))
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ring_buffer_unlock_commit(tr->buffer, event);
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trace_wake_up();
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}
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static void kmemtrace_kmalloc(unsigned long call_site,
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const void *ptr,
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size_t bytes_req,
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size_t bytes_alloc,
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gfp_t gfp_flags)
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{
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kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
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bytes_req, bytes_alloc, gfp_flags, -1);
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}
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static void kmemtrace_kmem_cache_alloc(unsigned long call_site,
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const void *ptr,
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size_t bytes_req,
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size_t bytes_alloc,
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gfp_t gfp_flags)
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{
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kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
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bytes_req, bytes_alloc, gfp_flags, -1);
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}
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static void kmemtrace_kmalloc_node(unsigned long call_site,
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const void *ptr,
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size_t bytes_req,
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size_t bytes_alloc,
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gfp_t gfp_flags,
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int node)
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{
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kmemtrace_alloc(KMEMTRACE_TYPE_KMALLOC, call_site, ptr,
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bytes_req, bytes_alloc, gfp_flags, node);
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}
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static void kmemtrace_kmem_cache_alloc_node(unsigned long call_site,
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const void *ptr,
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size_t bytes_req,
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size_t bytes_alloc,
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gfp_t gfp_flags,
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int node)
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{
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kmemtrace_alloc(KMEMTRACE_TYPE_CACHE, call_site, ptr,
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bytes_req, bytes_alloc, gfp_flags, node);
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}
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static void kmemtrace_kfree(unsigned long call_site, const void *ptr)
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{
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kmemtrace_free(KMEMTRACE_TYPE_KMALLOC, call_site, ptr);
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}
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static void kmemtrace_kmem_cache_free(unsigned long call_site, const void *ptr)
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{
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kmemtrace_free(KMEMTRACE_TYPE_CACHE, call_site, ptr);
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}
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static int kmemtrace_start_probes(void)
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{
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int err;
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err = register_trace_kmalloc(kmemtrace_kmalloc);
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if (err)
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return err;
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err = register_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
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if (err)
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return err;
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err = register_trace_kmalloc_node(kmemtrace_kmalloc_node);
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if (err)
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return err;
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err = register_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
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if (err)
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return err;
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err = register_trace_kfree(kmemtrace_kfree);
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if (err)
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return err;
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err = register_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
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return err;
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}
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static void kmemtrace_stop_probes(void)
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{
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unregister_trace_kmalloc(kmemtrace_kmalloc);
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unregister_trace_kmem_cache_alloc(kmemtrace_kmem_cache_alloc);
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unregister_trace_kmalloc_node(kmemtrace_kmalloc_node);
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unregister_trace_kmem_cache_alloc_node(kmemtrace_kmem_cache_alloc_node);
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unregister_trace_kfree(kmemtrace_kfree);
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unregister_trace_kmem_cache_free(kmemtrace_kmem_cache_free);
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}
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static int kmem_trace_init(struct trace_array *tr)
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{
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int cpu;
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kmemtrace_array = tr;
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for_each_cpu(cpu, cpu_possible_mask)
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tracing_reset(tr, cpu);
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kmemtrace_start_probes();
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return 0;
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}
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static void kmem_trace_reset(struct trace_array *tr)
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{
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kmemtrace_stop_probes();
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}
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static void kmemtrace_headers(struct seq_file *s)
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{
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/* Don't need headers for the original kmemtrace output */
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if (!(kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL))
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return;
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seq_printf(s, "#\n");
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seq_printf(s, "# ALLOC TYPE REQ GIVEN FLAGS "
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" POINTER NODE CALLER\n");
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seq_printf(s, "# FREE | | | | "
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" | | | |\n");
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seq_printf(s, "# |\n\n");
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}
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/*
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* The following functions give the original output from kmemtrace,
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* plus the origin CPU, since reordering occurs in-kernel now.
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*/
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#define KMEMTRACE_USER_ALLOC 0
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#define KMEMTRACE_USER_FREE 1
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struct kmemtrace_user_event {
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u8 event_id;
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u8 type_id;
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u16 event_size;
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u32 cpu;
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u64 timestamp;
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unsigned long call_site;
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unsigned long ptr;
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};
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struct kmemtrace_user_event_alloc {
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size_t bytes_req;
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size_t bytes_alloc;
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unsigned gfp_flags;
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int node;
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};
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static enum print_line_t
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kmemtrace_print_alloc_user(struct trace_iterator *iter,
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struct kmemtrace_alloc_entry *entry)
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{
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struct kmemtrace_user_event_alloc *ev_alloc;
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struct trace_seq *s = &iter->seq;
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struct kmemtrace_user_event *ev;
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ev = trace_seq_reserve(s, sizeof(*ev));
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if (!ev)
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return TRACE_TYPE_PARTIAL_LINE;
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ev->event_id = KMEMTRACE_USER_ALLOC;
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ev->type_id = entry->type_id;
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ev->event_size = sizeof(*ev) + sizeof(*ev_alloc);
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ev->cpu = iter->cpu;
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ev->timestamp = iter->ts;
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ev->call_site = entry->call_site;
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ev->ptr = (unsigned long)entry->ptr;
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ev_alloc = trace_seq_reserve(s, sizeof(*ev_alloc));
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if (!ev_alloc)
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return TRACE_TYPE_PARTIAL_LINE;
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ev_alloc->bytes_req = entry->bytes_req;
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ev_alloc->bytes_alloc = entry->bytes_alloc;
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ev_alloc->gfp_flags = entry->gfp_flags;
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ev_alloc->node = entry->node;
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return TRACE_TYPE_HANDLED;
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}
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static enum print_line_t
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kmemtrace_print_free_user(struct trace_iterator *iter,
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struct kmemtrace_free_entry *entry)
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{
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struct trace_seq *s = &iter->seq;
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struct kmemtrace_user_event *ev;
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ev = trace_seq_reserve(s, sizeof(*ev));
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if (!ev)
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return TRACE_TYPE_PARTIAL_LINE;
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ev->event_id = KMEMTRACE_USER_FREE;
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ev->type_id = entry->type_id;
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ev->event_size = sizeof(*ev);
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ev->cpu = iter->cpu;
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ev->timestamp = iter->ts;
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ev->call_site = entry->call_site;
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ev->ptr = (unsigned long)entry->ptr;
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return TRACE_TYPE_HANDLED;
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}
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/* The two other following provide a more minimalistic output */
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static enum print_line_t
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kmemtrace_print_alloc_compress(struct trace_iterator *iter,
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struct kmemtrace_alloc_entry *entry)
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{
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struct trace_seq *s = &iter->seq;
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int ret;
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/* Alloc entry */
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ret = trace_seq_printf(s, " + ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Type */
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switch (entry->type_id) {
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case KMEMTRACE_TYPE_KMALLOC:
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ret = trace_seq_printf(s, "K ");
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break;
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case KMEMTRACE_TYPE_CACHE:
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ret = trace_seq_printf(s, "C ");
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break;
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case KMEMTRACE_TYPE_PAGES:
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ret = trace_seq_printf(s, "P ");
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break;
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default:
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ret = trace_seq_printf(s, "? ");
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}
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Requested */
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ret = trace_seq_printf(s, "%4zu ", entry->bytes_req);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Allocated */
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ret = trace_seq_printf(s, "%4zu ", entry->bytes_alloc);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Flags
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* TODO: would be better to see the name of the GFP flag names
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*/
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ret = trace_seq_printf(s, "%08x ", entry->gfp_flags);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Pointer to allocated */
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ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Node */
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ret = trace_seq_printf(s, "%4d ", entry->node);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Call site */
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ret = seq_print_ip_sym(s, entry->call_site, 0);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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if (!trace_seq_printf(s, "\n"))
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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 enum print_line_t
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kmemtrace_print_free_compress(struct trace_iterator *iter,
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struct kmemtrace_free_entry *entry)
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{
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struct trace_seq *s = &iter->seq;
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int ret;
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/* Free entry */
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ret = trace_seq_printf(s, " - ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Type */
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switch (entry->type_id) {
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case KMEMTRACE_TYPE_KMALLOC:
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ret = trace_seq_printf(s, "K ");
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break;
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case KMEMTRACE_TYPE_CACHE:
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ret = trace_seq_printf(s, "C ");
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break;
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case KMEMTRACE_TYPE_PAGES:
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ret = trace_seq_printf(s, "P ");
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break;
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default:
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ret = trace_seq_printf(s, "? ");
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}
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Skip requested/allocated/flags */
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Pointer to allocated */
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ret = trace_seq_printf(s, "0x%tx ", (ptrdiff_t)entry->ptr);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Skip node */
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ret = trace_seq_printf(s, " ");
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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/* Call site */
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ret = seq_print_ip_sym(s, entry->call_site, 0);
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if (!ret)
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return TRACE_TYPE_PARTIAL_LINE;
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if (!trace_seq_printf(s, "\n"))
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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 enum print_line_t kmemtrace_print_line(struct trace_iterator *iter)
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{
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struct trace_entry *entry = iter->ent;
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switch (entry->type) {
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case TRACE_KMEM_ALLOC: {
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struct kmemtrace_alloc_entry *field;
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trace_assign_type(field, entry);
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if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
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return kmemtrace_print_alloc_compress(iter, field);
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else
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return kmemtrace_print_alloc_user(iter, field);
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}
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case TRACE_KMEM_FREE: {
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struct kmemtrace_free_entry *field;
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trace_assign_type(field, entry);
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if (kmem_tracer_flags.val & TRACE_KMEM_OPT_MINIMAL)
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return kmemtrace_print_free_compress(iter, field);
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else
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return kmemtrace_print_free_user(iter, field);
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}
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default:
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return TRACE_TYPE_UNHANDLED;
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}
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}
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static struct tracer kmem_tracer __read_mostly = {
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.name = "kmemtrace",
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.init = kmem_trace_init,
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.reset = kmem_trace_reset,
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.print_line = kmemtrace_print_line,
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.print_header = kmemtrace_headers,
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.flags = &kmem_tracer_flags
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};
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void kmemtrace_init(void)
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{
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/* earliest opportunity to start kmem tracing */
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}
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static int __init init_kmem_tracer(void)
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{
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return register_tracer(&kmem_tracer);
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}
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device_initcall(init_kmem_tracer);
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