From 35995a4d815586bc968a857f7235707940a2f755 Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Tue, 19 Aug 2008 20:43:25 +0300 Subject: SLUB: Replace __builtin_return_address(0) with _RET_IP_. This patch replaces __builtin_return_address(0) with _RET_IP_, since a previous patch moved _RET_IP_ and _THIS_IP_ to include/linux/kernel.h and they're widely available now. This makes for shorter and easier to read code. [penberg@cs.helsinki.fi: remove _RET_IP_ casts to void pointer] Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/slab.c | 8 ++++---- mm/slub.c | 48 ++++++++++++++++++++++++------------------------ 2 files changed, 28 insertions(+), 28 deletions(-) (limited to 'mm') diff --git a/mm/slab.c b/mm/slab.c index 09187517f9dc..a14787799014 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -3686,9 +3686,9 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node) EXPORT_SYMBOL(__kmalloc_node); void *__kmalloc_node_track_caller(size_t size, gfp_t flags, - int node, void *caller) + int node, unsigned long caller) { - return __do_kmalloc_node(size, flags, node, caller); + return __do_kmalloc_node(size, flags, node, (void *)caller); } EXPORT_SYMBOL(__kmalloc_node_track_caller); #else @@ -3730,9 +3730,9 @@ void *__kmalloc(size_t size, gfp_t flags) } EXPORT_SYMBOL(__kmalloc); -void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) +void *__kmalloc_track_caller(size_t size, gfp_t flags, unsigned long caller) { - return __do_kmalloc(size, flags, caller); + return __do_kmalloc(size, flags, (void *)caller); } EXPORT_SYMBOL(__kmalloc_track_caller); diff --git a/mm/slub.c b/mm/slub.c index 7ad489af9561..06da86654875 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -178,7 +178,7 @@ static LIST_HEAD(slab_caches); * Tracking user of a slab. */ struct track { - void *addr; /* Called from address */ + unsigned long addr; /* Called from address */ int cpu; /* Was running on cpu */ int pid; /* Pid context */ unsigned long when; /* When did the operation occur */ @@ -367,7 +367,7 @@ static struct track *get_track(struct kmem_cache *s, void *object, } static void set_track(struct kmem_cache *s, void *object, - enum track_item alloc, void *addr) + enum track_item alloc, unsigned long addr) { struct track *p; @@ -391,8 +391,8 @@ static void init_tracking(struct kmem_cache *s, void *object) if (!(s->flags & SLAB_STORE_USER)) return; - set_track(s, object, TRACK_FREE, NULL); - set_track(s, object, TRACK_ALLOC, NULL); + set_track(s, object, TRACK_FREE, 0UL); + set_track(s, object, TRACK_ALLOC, 0UL); } static void print_track(const char *s, struct track *t) @@ -401,7 +401,7 @@ static void print_track(const char *s, struct track *t) return; printk(KERN_ERR "INFO: %s in %pS age=%lu cpu=%u pid=%d\n", - s, t->addr, jiffies - t->when, t->cpu, t->pid); + s, (void *)t->addr, jiffies - t->when, t->cpu, t->pid); } static void print_tracking(struct kmem_cache *s, void *object) @@ -866,7 +866,7 @@ static void setup_object_debug(struct kmem_cache *s, struct page *page, } static int alloc_debug_processing(struct kmem_cache *s, struct page *page, - void *object, void *addr) + void *object, unsigned long addr) { if (!check_slab(s, page)) goto bad; @@ -906,7 +906,7 @@ bad: } static int free_debug_processing(struct kmem_cache *s, struct page *page, - void *object, void *addr) + void *object, unsigned long addr) { if (!check_slab(s, page)) goto fail; @@ -1029,10 +1029,10 @@ static inline void setup_object_debug(struct kmem_cache *s, struct page *page, void *object) {} static inline int alloc_debug_processing(struct kmem_cache *s, - struct page *page, void *object, void *addr) { return 0; } + struct page *page, void *object, unsigned long addr) { return 0; } static inline int free_debug_processing(struct kmem_cache *s, - struct page *page, void *object, void *addr) { return 0; } + struct page *page, void *object, unsigned long addr) { return 0; } static inline int slab_pad_check(struct kmem_cache *s, struct page *page) { return 1; } @@ -1499,8 +1499,8 @@ static inline int node_match(struct kmem_cache_cpu *c, int node) * we need to allocate a new slab. This is the slowest path since it involves * a call to the page allocator and the setup of a new slab. */ -static void *__slab_alloc(struct kmem_cache *s, - gfp_t gfpflags, int node, void *addr, struct kmem_cache_cpu *c) +static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node, + unsigned long addr, struct kmem_cache_cpu *c) { void **object; struct page *new; @@ -1584,7 +1584,7 @@ debug: * Otherwise we can simply pick the next object from the lockless free list. */ static __always_inline void *slab_alloc(struct kmem_cache *s, - gfp_t gfpflags, int node, void *addr) + gfp_t gfpflags, int node, unsigned long addr) { void **object; struct kmem_cache_cpu *c; @@ -1613,14 +1613,14 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) { - return slab_alloc(s, gfpflags, -1, __builtin_return_address(0)); + return slab_alloc(s, gfpflags, -1, _RET_IP_); } EXPORT_SYMBOL(kmem_cache_alloc); #ifdef CONFIG_NUMA void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) { - return slab_alloc(s, gfpflags, node, __builtin_return_address(0)); + return slab_alloc(s, gfpflags, node, _RET_IP_); } EXPORT_SYMBOL(kmem_cache_alloc_node); #endif @@ -1634,7 +1634,7 @@ EXPORT_SYMBOL(kmem_cache_alloc_node); * handling required then we can return immediately. */ static void __slab_free(struct kmem_cache *s, struct page *page, - void *x, void *addr, unsigned int offset) + void *x, unsigned long addr, unsigned int offset) { void *prior; void **object = (void *)x; @@ -1704,7 +1704,7 @@ debug: * with all sorts of special processing. */ static __always_inline void slab_free(struct kmem_cache *s, - struct page *page, void *x, void *addr) + struct page *page, void *x, unsigned long addr) { void **object = (void *)x; struct kmem_cache_cpu *c; @@ -1731,7 +1731,7 @@ void kmem_cache_free(struct kmem_cache *s, void *x) page = virt_to_head_page(x); - slab_free(s, page, x, __builtin_return_address(0)); + slab_free(s, page, x, _RET_IP_); } EXPORT_SYMBOL(kmem_cache_free); @@ -2659,7 +2659,7 @@ void *__kmalloc(size_t size, gfp_t flags) if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, flags, -1, __builtin_return_address(0)); + return slab_alloc(s, flags, -1, _RET_IP_); } EXPORT_SYMBOL(__kmalloc); @@ -2687,7 +2687,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node) if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, flags, node, __builtin_return_address(0)); + return slab_alloc(s, flags, node, _RET_IP_); } EXPORT_SYMBOL(__kmalloc_node); #endif @@ -2744,7 +2744,7 @@ void kfree(const void *x) put_page(page); return; } - slab_free(page->slab, page, object, __builtin_return_address(0)); + slab_free(page->slab, page, object, _RET_IP_); } EXPORT_SYMBOL(kfree); @@ -3200,7 +3200,7 @@ static struct notifier_block __cpuinitdata slab_notifier = { #endif -void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller) +void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) { struct kmem_cache *s; @@ -3216,7 +3216,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller) } void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, - int node, void *caller) + int node, unsigned long caller) { struct kmem_cache *s; @@ -3427,7 +3427,7 @@ static void resiliency_test(void) {}; struct location { unsigned long count; - void *addr; + unsigned long addr; long long sum_time; long min_time; long max_time; @@ -3475,7 +3475,7 @@ static int add_location(struct loc_track *t, struct kmem_cache *s, { long start, end, pos; struct location *l; - void *caddr; + unsigned long caddr; unsigned long age = jiffies - track->when; start = -1; -- cgit v1.2.2 From b9ce08c01020eb28bfbfa6faf1c740281c5f418e Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Sun, 10 Aug 2008 20:14:03 +0300 Subject: kmemtrace: Core implementation. kmemtrace provides tracing for slab allocator functions, such as kmalloc, kfree, kmem_cache_alloc, kmem_cache_free etc.. Collected data is then fed to the userspace application in order to analyse allocation hotspots, internal fragmentation and so on, making it possible to see how well an allocator performs, as well as debug and profile kernel code. Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/Makefile | 1 + mm/kmemtrace.c | 335 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 336 insertions(+) create mode 100644 mm/kmemtrace.c (limited to 'mm') diff --git a/mm/Makefile b/mm/Makefile index c06b45a1ff5f..3782eb66d4b3 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -34,3 +34,4 @@ obj-$(CONFIG_MIGRATION) += migrate.o obj-$(CONFIG_SMP) += allocpercpu.o obj-$(CONFIG_QUICKLIST) += quicklist.o obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o +obj-$(CONFIG_KMEMTRACE) += kmemtrace.o diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c new file mode 100644 index 000000000000..83ad1cc71a92 --- /dev/null +++ b/mm/kmemtrace.c @@ -0,0 +1,335 @@ +/* + * Copyright (C) 2008 Pekka Enberg, Eduard - Gabriel Munteanu + * + * This file is released under GPL version 2. + */ + +#include +#include +#include +#include +#include +#include +#include + +#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; +#ifdef CONFIG_KMEMTRACE_DEFAULT_ENABLED +static unsigned int kmemtrace_enabled = 1; +#else +static unsigned int kmemtrace_enabled = 0; +#endif + +/* + * 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_enabled) + return; + + 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 (unlikely(!kmemtrace_chan)) { + printk(KERN_ERR "kmemtrace: could not open relay channel.\n"); + return; + } + + if (unlikely(kmemtrace_start_probes())) + goto probe_fail; + + printk(KERN_INFO "kmemtrace: early init successful.\n"); + + return; + +probe_fail: + printk(KERN_ERR "kmemtrace: could not register marker probes!\n"); + kmemtrace_cleanup(); +} + -- cgit v1.2.2 From 36555751c6751a5bdfd6d7bdf0648343bb1ef0de Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Sun, 10 Aug 2008 20:14:05 +0300 Subject: kmemtrace: SLAB hooks. This adds hooks for the SLAB allocator, to allow tracing with kmemtrace. We also convert some inline functions to __always_inline to make sure _RET_IP_, which expands to __builtin_return_address(0), always works as expected. Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/slab.c | 71 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 64 insertions(+), 7 deletions(-) (limited to 'mm') diff --git a/mm/slab.c b/mm/slab.c index a14787799014..b6d9b8cdefa9 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -112,6 +112,7 @@ #include #include #include +#include #include #include @@ -568,6 +569,14 @@ static void **dbg_userword(struct kmem_cache *cachep, void *objp) #endif +#ifdef CONFIG_KMEMTRACE +size_t slab_buffer_size(struct kmem_cache *cachep) +{ + return cachep->buffer_size; +} +EXPORT_SYMBOL(slab_buffer_size); +#endif + /* * Do not go above this order unless 0 objects fit into the slab. */ @@ -3613,10 +3622,23 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp) */ void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags) { - return __cache_alloc(cachep, flags, __builtin_return_address(0)); + void *ret = __cache_alloc(cachep, flags, __builtin_return_address(0)); + + kmemtrace_mark_alloc(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret, + obj_size(cachep), cachep->buffer_size, flags); + + return ret; } EXPORT_SYMBOL(kmem_cache_alloc); +#ifdef CONFIG_KMEMTRACE +void *kmem_cache_alloc_notrace(struct kmem_cache *cachep, gfp_t flags) +{ + return __cache_alloc(cachep, flags, __builtin_return_address(0)); +} +EXPORT_SYMBOL(kmem_cache_alloc_notrace); +#endif + /** * kmem_ptr_validate - check if an untrusted pointer might be a slab entry. * @cachep: the cache we're checking against @@ -3661,23 +3683,47 @@ out: #ifdef CONFIG_NUMA void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid) { - return __cache_alloc_node(cachep, flags, nodeid, - __builtin_return_address(0)); + void *ret = __cache_alloc_node(cachep, flags, nodeid, + __builtin_return_address(0)); + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret, + obj_size(cachep), cachep->buffer_size, + flags, nodeid); + + return ret; } EXPORT_SYMBOL(kmem_cache_alloc_node); +#ifdef CONFIG_KMEMTRACE +void *kmem_cache_alloc_node_notrace(struct kmem_cache *cachep, + gfp_t flags, + int nodeid) +{ + return __cache_alloc_node(cachep, flags, nodeid, + __builtin_return_address(0)); +} +EXPORT_SYMBOL(kmem_cache_alloc_node_notrace); +#endif + static __always_inline void * __do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller) { struct kmem_cache *cachep; + void *ret; cachep = kmem_find_general_cachep(size, flags); if (unlikely(ZERO_OR_NULL_PTR(cachep))) return cachep; - return kmem_cache_alloc_node(cachep, flags, node); + ret = kmem_cache_alloc_node_notrace(cachep, flags, node); + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, + (unsigned long) caller, ret, + size, cachep->buffer_size, flags, node); + + return ret; } -#ifdef CONFIG_DEBUG_SLAB +#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_KMEMTRACE) void *__kmalloc_node(size_t size, gfp_t flags, int node) { return __do_kmalloc_node(size, flags, node, @@ -3710,6 +3756,7 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, void *caller) { struct kmem_cache *cachep; + void *ret; /* If you want to save a few bytes .text space: replace * __ with kmem_. @@ -3719,11 +3766,17 @@ static __always_inline void *__do_kmalloc(size_t size, gfp_t flags, cachep = __find_general_cachep(size, flags); if (unlikely(ZERO_OR_NULL_PTR(cachep))) return cachep; - return __cache_alloc(cachep, flags, caller); + ret = __cache_alloc(cachep, flags, caller); + + kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, + (unsigned long) caller, ret, + size, cachep->buffer_size, flags); + + return ret; } -#ifdef CONFIG_DEBUG_SLAB +#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_KMEMTRACE) void *__kmalloc(size_t size, gfp_t flags) { return __do_kmalloc(size, flags, __builtin_return_address(0)); @@ -3762,6 +3815,8 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp) debug_check_no_obj_freed(objp, obj_size(cachep)); __cache_free(cachep, objp); local_irq_restore(flags); + + kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, objp); } EXPORT_SYMBOL(kmem_cache_free); @@ -3788,6 +3843,8 @@ void kfree(const void *objp) debug_check_no_obj_freed(objp, obj_size(c)); __cache_free(c, (void *)objp); local_irq_restore(flags); + + kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, objp); } EXPORT_SYMBOL(kfree); -- cgit v1.2.2 From 3eae2cb24a96509e0a38cc48dc1538a2826f4e33 Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Sun, 10 Aug 2008 20:14:07 +0300 Subject: kmemtrace: SLOB hooks. This adds hooks for the SLOB allocator, to allow tracing with kmemtrace. We also convert some inline functions to __always_inline to make sure _RET_IP_, which expands to __builtin_return_address(0), always works as expected. Acked-by: Matt Mackall Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/slob.c | 37 +++++++++++++++++++++++++++++++------ 1 file changed, 31 insertions(+), 6 deletions(-) (limited to 'mm') diff --git a/mm/slob.c b/mm/slob.c index cb675d126791..55de44ae5d30 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -65,6 +65,7 @@ #include #include #include +#include #include /* @@ -463,27 +464,38 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node) { unsigned int *m; int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN); + void *ret; if (size < PAGE_SIZE - align) { if (!size) return ZERO_SIZE_PTR; m = slob_alloc(size + align, gfp, align, node); + if (!m) return NULL; *m = size; - return (void *)m + align; + ret = (void *)m + align; + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, + _RET_IP_, ret, + size, size + align, gfp, node); } else { - void *ret; + unsigned int order = get_order(size); - ret = slob_new_page(gfp | __GFP_COMP, get_order(size), node); + ret = slob_new_page(gfp | __GFP_COMP, order, node); if (ret) { struct page *page; page = virt_to_page(ret); page->private = size; } - return ret; + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, + _RET_IP_, ret, + size, PAGE_SIZE << order, gfp, node); } + + return ret; } EXPORT_SYMBOL(__kmalloc_node); @@ -501,6 +513,8 @@ void kfree(const void *block) slob_free(m, *m + align); } else put_page(&sp->page); + + kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, block); } EXPORT_SYMBOL(kfree); @@ -569,10 +583,19 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node) { void *b; - if (c->size < PAGE_SIZE) + if (c->size < PAGE_SIZE) { b = slob_alloc(c->size, flags, c->align, node); - else + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, + _RET_IP_, b, c->size, + SLOB_UNITS(c->size) * SLOB_UNIT, + flags, node); + } else { b = slob_new_page(flags, get_order(c->size), node); + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, + _RET_IP_, b, c->size, + PAGE_SIZE << get_order(c->size), + flags, node); + } if (c->ctor) c->ctor(b); @@ -608,6 +631,8 @@ void kmem_cache_free(struct kmem_cache *c, void *b) } else { __kmem_cache_free(b, c->size); } + + kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, b); } EXPORT_SYMBOL(kmem_cache_free); -- cgit v1.2.2 From 5b882be4e00e53a44f47ad7eb997cac2938848bf Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Tue, 19 Aug 2008 20:43:26 +0300 Subject: kmemtrace: SLUB hooks. This adds hooks for the SLUB allocator, to allow tracing with kmemtrace. Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/slub.c | 65 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++------ 1 file changed, 59 insertions(+), 6 deletions(-) (limited to 'mm') diff --git a/mm/slub.c b/mm/slub.c index 06da86654875..4c48a0146afd 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -24,6 +24,7 @@ #include #include #include +#include /* * Lock order: @@ -1613,18 +1614,46 @@ static __always_inline void *slab_alloc(struct kmem_cache *s, void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags) { - return slab_alloc(s, gfpflags, -1, _RET_IP_); + void *ret = slab_alloc(s, gfpflags, -1, _RET_IP_); + + kmemtrace_mark_alloc(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret, + s->objsize, s->size, gfpflags); + + return ret; } EXPORT_SYMBOL(kmem_cache_alloc); +#ifdef CONFIG_KMEMTRACE +void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags) +{ + return slab_alloc(s, gfpflags, -1, _RET_IP_); +} +EXPORT_SYMBOL(kmem_cache_alloc_notrace); +#endif + #ifdef CONFIG_NUMA void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node) { - return slab_alloc(s, gfpflags, node, _RET_IP_); + void *ret = slab_alloc(s, gfpflags, node, _RET_IP_); + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret, + s->objsize, s->size, gfpflags, node); + + return ret; } EXPORT_SYMBOL(kmem_cache_alloc_node); #endif +#ifdef CONFIG_KMEMTRACE +void *kmem_cache_alloc_node_notrace(struct kmem_cache *s, + gfp_t gfpflags, + int node) +{ + return slab_alloc(s, gfpflags, node, _RET_IP_); +} +EXPORT_SYMBOL(kmem_cache_alloc_node_notrace); +#endif + /* * Slow patch handling. This may still be called frequently since objects * have a longer lifetime than the cpu slabs in most processing loads. @@ -1732,6 +1761,8 @@ void kmem_cache_free(struct kmem_cache *s, void *x) page = virt_to_head_page(x); slab_free(s, page, x, _RET_IP_); + + kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, x); } EXPORT_SYMBOL(kmem_cache_free); @@ -2650,6 +2681,7 @@ static struct kmem_cache *get_slab(size_t size, gfp_t flags) void *__kmalloc(size_t size, gfp_t flags) { struct kmem_cache *s; + void *ret; if (unlikely(size > PAGE_SIZE)) return kmalloc_large(size, flags); @@ -2659,7 +2691,12 @@ void *__kmalloc(size_t size, gfp_t flags) if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, flags, -1, _RET_IP_); + ret = slab_alloc(s, flags, -1, _RET_IP_); + + kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, ret, + size, s->size, flags); + + return ret; } EXPORT_SYMBOL(__kmalloc); @@ -2678,16 +2715,30 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node) void *__kmalloc_node(size_t size, gfp_t flags, int node) { struct kmem_cache *s; + void *ret; - if (unlikely(size > PAGE_SIZE)) - return kmalloc_large_node(size, flags, node); + if (unlikely(size > PAGE_SIZE)) { + ret = kmalloc_large_node(size, flags, node); + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, + _RET_IP_, ret, + size, PAGE_SIZE << get_order(size), + flags, node); + + return ret; + } s = get_slab(size, flags); if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, flags, node, _RET_IP_); + ret = slab_alloc(s, flags, node, _RET_IP_); + + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, ret, + size, s->size, flags, node); + + return ret; } EXPORT_SYMBOL(__kmalloc_node); #endif @@ -2745,6 +2796,8 @@ void kfree(const void *x) return; } slab_free(page->slab, page, object, _RET_IP_); + + kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, x); } EXPORT_SYMBOL(kfree); -- cgit v1.2.2 From 94b528d0564997d88e8bf166d8c9080536ad8bdc Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Sun, 24 Aug 2008 20:49:35 +0300 Subject: kmemtrace: SLUB hooks for caller-tracking functions. This patch adds kmemtrace hooks for __kmalloc_track_caller() and __kmalloc_node_track_caller(). Currently, they set the call site pointer to the value recieved as a parameter. (This could change if we implement stack trace exporting in kmemtrace.) Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/slub.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) (limited to 'mm') diff --git a/mm/slub.c b/mm/slub.c index 4c48a0146afd..4ce61c86f581 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3256,6 +3256,7 @@ static struct notifier_block __cpuinitdata slab_notifier = { void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) { struct kmem_cache *s; + void *ret; if (unlikely(size > PAGE_SIZE)) return kmalloc_large(size, gfpflags); @@ -3265,13 +3266,20 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, gfpflags, -1, caller); + ret = slab_alloc(s, gfpflags, -1, caller); + + /* Honor the call site pointer we recieved. */ + kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, (unsigned long) caller, + ret, size, s->size, gfpflags); + + return ret; } void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, int node, unsigned long caller) { struct kmem_cache *s; + void *ret; if (unlikely(size > PAGE_SIZE)) return kmalloc_large_node(size, gfpflags, node); @@ -3281,7 +3289,14 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, if (unlikely(ZERO_OR_NULL_PTR(s))) return s; - return slab_alloc(s, gfpflags, node, caller); + ret = slab_alloc(s, gfpflags, node, caller); + + /* Honor the call site pointer we recieved. */ + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, + (unsigned long) caller, ret, + size, s->size, gfpflags, node); + + return ret; } #ifdef CONFIG_SLUB_DEBUG -- cgit v1.2.2 From 2e67624c22321fa40ad3aa89c307c84bd679d9b2 Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Mon, 1 Sep 2008 10:11:54 +0300 Subject: kmemtrace: remove unnecessary casts Now that we use _RET_IP_ there's no need to cast 'caller' to unsigned long. Signed-off-by: Pekka Enberg --- mm/slub.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) (limited to 'mm') diff --git a/mm/slub.c b/mm/slub.c index 4ce61c86f581..e27472368cc3 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -3269,8 +3269,8 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) ret = slab_alloc(s, gfpflags, -1, caller); /* Honor the call site pointer we recieved. */ - kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, (unsigned long) caller, - ret, size, s->size, gfpflags); + kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, caller, ret, size, + s->size, gfpflags); return ret; } @@ -3292,8 +3292,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, ret = slab_alloc(s, gfpflags, node, caller); /* Honor the call site pointer we recieved. */ - kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, - (unsigned long) caller, ret, + kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, caller, ret, size, s->size, gfpflags, node); return ret; -- cgit v1.2.2 From faa97abe6a3673af268abb661c6b663252a911aa Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Fri, 10 Oct 2008 10:57:44 +0300 Subject: kmemtrace: allow kmemtrace to be enabled after boot The kmemtrace_init() function returns early if kmemtrace is disabled at boot causing kmemtrace_setup_late() to also bail out on NULL channel. This has the unfortunate side effect that none of the debugfs files needed to enable kmemtrace after boot are created. Cc: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/kmemtrace.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) (limited to 'mm') diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c index 83ad1cc71a92..f7a49c077df2 100644 --- a/mm/kmemtrace.c +++ b/mm/kmemtrace.c @@ -307,29 +307,29 @@ early_param("kmemtrace.subbufs", kmemtrace_set_subbufs); void kmemtrace_init(void) { - if (!kmemtrace_enabled) - return; - 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 (unlikely(!kmemtrace_chan)) { + if (!kmemtrace_chan) { printk(KERN_ERR "kmemtrace: could not open relay channel.\n"); return; } - if (unlikely(kmemtrace_start_probes())) - goto probe_fail; - - printk(KERN_INFO "kmemtrace: early init successful.\n"); - - return; + if (!kmemtrace_enabled) { + printk(KERN_INFO "kmemtrace: disabled. Pass " + "kemtrace.enable=yes as kernel parameter for " + "boot-time tracing."); + return; + } + if (kmemtrace_start_probes()) { + printk(KERN_ERR "kmemtrace: could not register marker probes!\n"); + kmemtrace_cleanup(); + return; + } -probe_fail: - printk(KERN_ERR "kmemtrace: could not register marker probes!\n"); - kmemtrace_cleanup(); + printk(KERN_INFO "kmemtrace: enabled.\n"); } -- cgit v1.2.2 From bf6803d6fd654d9a73cd90308b5225d78655d027 Mon Sep 17 00:00:00 2001 From: Pekka Enberg Date: Fri, 10 Oct 2008 11:02:59 +0300 Subject: kmemtrace: remove config option for enabling tracing at boot Users can pass kmemtrace.enabled=yes as a kernel parameter to enable kmemtrace at boot so remove the useless CONFIG_KMEMTRACE_DEFAULT_ENABLED config option. Cc: Eduard - Gabriel Munteanu Signed-off-by: Pekka Enberg --- mm/kmemtrace.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) (limited to 'mm') diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c index f7a49c077df2..f7704f52c4b1 100644 --- a/mm/kmemtrace.c +++ b/mm/kmemtrace.c @@ -19,11 +19,9 @@ static struct rchan *kmemtrace_chan; static u32 kmemtrace_buf_overruns; static unsigned int kmemtrace_n_subbufs; -#ifdef CONFIG_KMEMTRACE_DEFAULT_ENABLED -static unsigned int kmemtrace_enabled = 1; -#else -static unsigned int kmemtrace_enabled = 0; -#endif + +/* disabled by default */ +static unsigned int kmemtrace_enabled; /* * The sequence number is used for reordering kmemtrace packets -- cgit v1.2.2 From a4900437f3d76761a1646cd90254ccb01714a9ed Mon Sep 17 00:00:00 2001 From: Vegard Nossum Date: Thu, 6 Nov 2008 17:42:18 +0100 Subject: kmemtrace: add missing newline This was causing artifacts in my dmesg. Acked-by: Eduard - Gabriel Munteanu Signed-off-by: Vegard Nossum Signed-off-by: Pekka Enberg --- mm/kmemtrace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c index f7704f52c4b1..2a70a805027c 100644 --- a/mm/kmemtrace.c +++ b/mm/kmemtrace.c @@ -319,7 +319,7 @@ void kmemtrace_init(void) if (!kmemtrace_enabled) { printk(KERN_INFO "kmemtrace: disabled. Pass " "kemtrace.enable=yes as kernel parameter for " - "boot-time tracing."); + "boot-time tracing.\n"); return; } if (kmemtrace_start_probes()) { -- cgit v1.2.2 From 2a38b1c4f123afa4579cb1d29380b337e9195cbb Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Mon, 29 Dec 2008 15:29:04 +0100 Subject: kmemtrace: move #include lines Impact: avoid conflicts with kmemcheck kmemcheck modifies the same area of slab.c and slub.c - move the include lines up a bit. Signed-off-by: Ingo Molnar --- mm/slab.c | 2 +- mm/slub.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) (limited to 'mm') diff --git a/mm/slab.c b/mm/slab.c index b6d9b8cdefa9..bcf08ea88380 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -102,6 +102,7 @@ #include #include #include +#include #include #include #include @@ -112,7 +113,6 @@ #include #include #include -#include #include #include diff --git a/mm/slub.c b/mm/slub.c index 4cd7bfd2ab2c..cc4001fee7ac 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -24,7 +25,6 @@ #include #include #include -#include /* * Lock order: -- cgit v1.2.2 From 36994e58a48fb8f9651c7dc845a6de298aba5bfc Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Mon, 29 Dec 2008 13:42:23 -0800 Subject: tracing/kmemtrace: normalize the raw tracer event to the unified tracing API Impact: new tracer plugin This patch adapts kmemtrace raw events tracing to the unified tracing API. To enable and use this tracer, just do the following: echo kmemtrace > /debugfs/tracing/current_tracer cat /debugfs/tracing/trace You will have the following output: # tracer: kmemtrace # # # ALLOC TYPE REQ GIVEN FLAGS POINTER NODE CALLER # FREE | | | | | | | | # | type_id 1 call_site 18446744071565527833 ptr 18446612134395152256 type_id 0 call_site 18446744071565585597 ptr 18446612134405955584 bytes_req 4096 bytes_alloc 4096 gfp_flags 208 node -1 type_id 1 call_site 18446744071565585534 ptr 18446612134405955584 type_id 0 call_site 18446744071565585597 ptr 18446612134405955584 bytes_req 4096 bytes_alloc 4096 gfp_flags 208 node -1 type_id 0 call_site 18446744071565636711 ptr 18446612134345164672 bytes_req 240 bytes_alloc 240 gfp_flags 208 node -1 type_id 1 call_site 18446744071565585534 ptr 18446612134405955584 type_id 0 call_site 18446744071565585597 ptr 18446612134405955584 bytes_req 4096 bytes_alloc 4096 gfp_flags 208 node -1 type_id 0 call_site 18446744071565636711 ptr 18446612134345164912 bytes_req 240 bytes_alloc 240 gfp_flags 208 node -1 type_id 1 call_site 18446744071565585534 ptr 18446612134405955584 type_id 0 call_site 18446744071565585597 ptr 18446612134405955584 bytes_req 4096 bytes_alloc 4096 gfp_flags 208 node -1 type_id 0 call_site 18446744071565636711 ptr 18446612134345165152 bytes_req 240 bytes_alloc 240 gfp_flags 208 node -1 type_id 0 call_site 18446744071566144042 ptr 18446612134346191680 bytes_req 1304 bytes_alloc 1312 gfp_flags 208 node -1 type_id 1 call_site 18446744071565585534 ptr 18446612134405955584 type_id 0 call_site 18446744071565585597 ptr 18446612134405955584 bytes_req 4096 bytes_alloc 4096 gfp_flags 208 node -1 type_id 1 call_site 18446744071565585534 ptr 18446612134405955584 That was to stay backward compatible with the format output produced in inux/tracepoint.h. This is the default ouput, but note that I tried something else. If you change an option: echo kmem_minimalistic > /debugfs/trace_options and then cat /debugfs/trace, you will have the following output: # tracer: kmemtrace # # # ALLOC TYPE REQ GIVEN FLAGS POINTER NODE CALLER # FREE | | | | | | | | # | - C 0xffff88007c088780 file_free_rcu + K 4096 4096 000000d0 0xffff88007cad6000 -1 getname - C 0xffff88007cad6000 putname + K 4096 4096 000000d0 0xffff88007cad6000 -1 getname + K 240 240 000000d0 0xffff8800790dc780 -1 d_alloc - C 0xffff88007cad6000 putname + K 4096 4096 000000d0 0xffff88007cad6000 -1 getname + K 240 240 000000d0 0xffff8800790dc870 -1 d_alloc - C 0xffff88007cad6000 putname + K 4096 4096 000000d0 0xffff88007cad6000 -1 getname + K 240 240 000000d0 0xffff8800790dc960 -1 d_alloc + K 1304 1312 000000d0 0xffff8800791d7340 -1 reiserfs_alloc_inode - C 0xffff88007cad6000 putname + K 4096 4096 000000d0 0xffff88007cad6000 -1 getname - C 0xffff88007cad6000 putname + K 992 1000 000000d0 0xffff880079045b58 -1 alloc_inode + K 768 1024 000080d0 0xffff88007c096400 -1 alloc_pipe_info + K 240 240 000000d0 0xffff8800790dca50 -1 d_alloc + K 272 320 000080d0 0xffff88007c088780 -1 get_empty_filp + K 272 320 000080d0 0xffff88007c088000 -1 get_empty_filp Yeah I shall confess kmem_minimalistic should be: kmem_alternative. Whatever, I find it more readable but this a personal opinion of course. We can drop it if you want. On the ALLOC/FREE column, + means an allocation and - a free. On the type column, you have K = kmalloc, C = cache, P = page I would like the flags to be GFP_* strings but that would not be easy to not break the column with strings.... About the node...it seems to always be -1. I don't know why but that shouldn't be difficult to find. I moved linux/tracepoint.h to trace/tracepoint.h as well. I think that would be more easy to find the tracer headers if they are all in their common directory. Signed-off-by: Frederic Weisbecker Signed-off-by: Ingo Molnar --- mm/kmemtrace.c | 2 +- mm/slob.c | 2 +- mm/slub.c | 2 +- 3 files changed, 3 insertions(+), 3 deletions(-) (limited to 'mm') diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c index 2a70a805027c..0573b5080cc4 100644 --- a/mm/kmemtrace.c +++ b/mm/kmemtrace.c @@ -10,7 +10,7 @@ #include #include #include -#include +#include #define KMEMTRACE_SUBBUF_SIZE 524288 #define KMEMTRACE_DEF_N_SUBBUFS 20 diff --git a/mm/slob.c b/mm/slob.c index 0f1a49f40690..4d1c0fc33b6b 100644 --- a/mm/slob.c +++ b/mm/slob.c @@ -65,7 +65,7 @@ #include #include #include -#include +#include #include /* diff --git a/mm/slub.c b/mm/slub.c index cc4001fee7ac..7bf8cf8ec082 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -16,7 +16,7 @@ #include #include #include -#include +#include #include #include #include -- cgit v1.2.2 From 3fd4bc015ef879a7d2b955ce97fb125e3a51ba7e Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 30 Dec 2008 12:07:27 +0100 Subject: tracing/kmemtrace: export kmemtrace_mark_alloc_node() / kmemtrace_mark_free() Impact: build fix Also fix up Kconfig dependencies and include files. Signed-off-by: Ingo Molnar --- mm/slab.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/slab.c b/mm/slab.c index bcf08ea88380..7f72bb386a09 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -102,7 +102,7 @@ #include #include #include -#include +#include #include #include #include -- cgit v1.2.2 From f09eac9034a4502cce558b0ec4bf7d422b8b355b Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Wed, 31 Dec 2008 09:43:46 +0100 Subject: tracing/kmemtrace: fix typo Impact: build fix Signed-off-by: Ingo Molnar --- mm/slab.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'mm') diff --git a/mm/slab.c b/mm/slab.c index 83075f36df7b..c65c52dc78d4 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -102,7 +102,7 @@ #include #include #include -#include +#include #include #include #include -- cgit v1.2.2 From 723cbe0775514853c22dc45005af59c360916af1 Mon Sep 17 00:00:00 2001 From: Eduard - Gabriel Munteanu Date: Mon, 5 Jan 2009 22:09:58 +0200 Subject: kmemtrace: Remove the relay version of kmemtrace Impact: cleanup kmemtrace now uses ftrace. This patch removes the relay version. Signed-off-by: Eduard - Gabriel Munteanu Signed-off-by: Ingo Molnar --- mm/Makefile | 1 - mm/kmemtrace.c | 333 --------------------------------------------------------- 2 files changed, 334 deletions(-) delete mode 100644 mm/kmemtrace.c (limited to 'mm') diff --git a/mm/Makefile b/mm/Makefile index c92e8af13206..51c27709cc7c 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -35,4 +35,3 @@ obj-$(CONFIG_MIGRATION) += migrate.o obj-$(CONFIG_SMP) += allocpercpu.o obj-$(CONFIG_QUICKLIST) += quicklist.o obj-$(CONFIG_CGROUP_MEM_RES_CTLR) += memcontrol.o page_cgroup.o -obj-$(CONFIG_KMEMTRACE) += kmemtrace.o diff --git a/mm/kmemtrace.c b/mm/kmemtrace.c deleted file mode 100644 index 0573b5080cc4..000000000000 --- a/mm/kmemtrace.c +++ /dev/null @@ -1,333 +0,0 @@ -/* - * Copyright (C) 2008 Pekka Enberg, Eduard - Gabriel Munteanu - * - * This file is released under GPL version 2. - */ - -#include -#include -#include -#include -#include -#include -#include - -#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"); -} - -- cgit v1.2.2 From fe1200b63d158b28eef6d4de1e5b5f99c681ba2f Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Tue, 17 Feb 2009 12:05:07 -0500 Subject: SLUB: Introduce and use SLUB_MAX_SIZE and SLUB_PAGE_SHIFT constants As a preparational patch to bump up page allocator pass-through threshold, introduce two new constants SLUB_MAX_SIZE and SLUB_PAGE_SHIFT and convert mm/slub.c to use them. Reported-by: "Zhang, Yanmin" Tested-by: "Zhang, Yanmin" Signed-off-by: Christoph Lameter Signed-off-by: Pekka Enberg --- mm/slub.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) (limited to 'mm') diff --git a/mm/slub.c b/mm/slub.c index bdc9abb08a23..5a5e7f5bf799 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2475,7 +2475,7 @@ EXPORT_SYMBOL(kmem_cache_destroy); * Kmalloc subsystem *******************************************************************/ -struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1] __cacheline_aligned; +struct kmem_cache kmalloc_caches[SLUB_PAGE_SHIFT] __cacheline_aligned; EXPORT_SYMBOL(kmalloc_caches); static int __init setup_slub_min_order(char *str) @@ -2537,7 +2537,7 @@ panic: } #ifdef CONFIG_ZONE_DMA -static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT + 1]; +static struct kmem_cache *kmalloc_caches_dma[SLUB_PAGE_SHIFT]; static void sysfs_add_func(struct work_struct *w) { @@ -2658,7 +2658,7 @@ void *__kmalloc(size_t size, gfp_t flags) { struct kmem_cache *s; - if (unlikely(size > PAGE_SIZE)) + if (unlikely(size > SLUB_MAX_SIZE)) return kmalloc_large(size, flags); s = get_slab(size, flags); @@ -2686,7 +2686,7 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node) { struct kmem_cache *s; - if (unlikely(size > PAGE_SIZE)) + if (unlikely(size > SLUB_MAX_SIZE)) return kmalloc_large_node(size, flags, node); s = get_slab(size, flags); @@ -2985,7 +2985,7 @@ void __init kmem_cache_init(void) caches++; } - for (i = KMALLOC_SHIFT_LOW; i <= PAGE_SHIFT; i++) { + for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) { create_kmalloc_cache(&kmalloc_caches[i], "kmalloc", 1 << i, GFP_KERNEL); caches++; @@ -3022,7 +3022,7 @@ void __init kmem_cache_init(void) slab_state = UP; /* Provide the correct kmalloc names now that the caches are up */ - for (i = KMALLOC_SHIFT_LOW; i <= PAGE_SHIFT; i++) + for (i = KMALLOC_SHIFT_LOW; i < SLUB_PAGE_SHIFT; i++) kmalloc_caches[i]. name = kasprintf(GFP_KERNEL, "kmalloc-%d", 1 << i); @@ -3222,7 +3222,7 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller) { struct kmem_cache *s; - if (unlikely(size > PAGE_SIZE)) + if (unlikely(size > SLUB_MAX_SIZE)) return kmalloc_large(size, gfpflags); s = get_slab(size, gfpflags); @@ -3238,7 +3238,7 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, { struct kmem_cache *s; - if (unlikely(size > PAGE_SIZE)) + if (unlikely(size > SLUB_MAX_SIZE)) return kmalloc_large_node(size, gfpflags, node); s = get_slab(size, gfpflags); -- cgit v1.2.2 From 0e39ac444636ff5be39b26f1cb56d79594654dda Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 6 Mar 2009 10:35:52 -0500 Subject: tracing, Text Edit Lock - Architecture Independent Code This is an architecture independant synchronization around kernel text modifications through use of a global mutex. A mutex has been chosen so that kprobes, the main user of this, can sleep during memory allocation between the memory read of the instructions it must replace and the memory write of the breakpoint. Other user of this interface: immediate values. Paravirt and alternatives are always done when SMP is inactive, so there is no need to use locks. Signed-off-by: Mathieu Desnoyers LKML-Reference: <49B142D8.7020601@redhat.com> Signed-off-by: Ingo Molnar --- mm/memory.c | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'mm') diff --git a/mm/memory.c b/mm/memory.c index baa999e87cd2..05fab3bc5b4b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -48,6 +48,8 @@ #include #include #include +#include +#include #include #include #include @@ -99,6 +101,14 @@ int randomize_va_space __read_mostly = 2; #endif +/* + * mutex protecting text section modification (dynamic code patching). + * some users need to sleep (allocating memory...) while they hold this lock. + * + * NOT exported to modules - patching kernel text is a really delicate matter. + */ +DEFINE_MUTEX(text_mutex); + static int __init disable_randmaps(char *s) { randomize_va_space = 0; -- cgit v1.2.2 From 505f2b970b2269ce4cb669b3ff4f6479d379cec2 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Fri, 20 Mar 2009 11:05:04 +0100 Subject: tracing, Text Edit Lock - kprobes architecture independent support, nommu fix Impact: build fix on SH !CONFIG_MMU Stephen Rothwell reported this linux-next build failure on the SH architecture: kernel/built-in.o: In function `disable_all_kprobes': kernel/kprobes.c:1382: undefined reference to `text_mutex' [...] And observed: | Introduced by commit 4460fdad85becd569f11501ad5b91814814335ff ("tracing, | Text Edit Lock - kprobes architecture independent support") from the | tracing tree. text_mutex is defined in mm/memory.c which is only built | if CONFIG_MMU is defined, which is not true for sh allmodconfig. Move this lock to kernel/extable.c (which is already home to various kernel text related routines), which file is always built-in. Reported-by: Stephen Rothwell Cc: Paul Mundt Cc: Mathieu Desnoyers LKML-Reference: <20090320110602.86351a91.sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar --- mm/memory.c | 8 -------- 1 file changed, 8 deletions(-) (limited to 'mm') diff --git a/mm/memory.c b/mm/memory.c index 05fab3bc5b4b..dfc9e4ea4e8b 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -101,14 +101,6 @@ int randomize_va_space __read_mostly = 2; #endif -/* - * mutex protecting text section modification (dynamic code patching). - * some users need to sleep (allocating memory...) while they hold this lock. - * - * NOT exported to modules - patching kernel text is a really delicate matter. - */ -DEFINE_MUTEX(text_mutex); - static int __init disable_randmaps(char *s) { randomize_va_space = 0; -- cgit v1.2.2 From 548c316137901cc81dea35e26362a9d5ba0b89b6 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Tue, 31 Mar 2009 00:25:23 +0200 Subject: tracing, Text Edit Lock: cleanup Remove incorrectly introduced headers. Signed-off-by: Ingo Molnar --- mm/memory.c | 2 -- 1 file changed, 2 deletions(-) (limited to 'mm') diff --git a/mm/memory.c b/mm/memory.c index dfc9e4ea4e8b..baa999e87cd2 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -48,8 +48,6 @@ #include #include #include -#include -#include #include #include #include -- cgit v1.2.2