If persistent RAM is being used to record trace entries, allocate and free pages using ramtrace_alloc_page and ramtrace_free_page.
Signed-off-by: Nachammai Karuppiah <nachukan...@gmail.com> --- kernel/trace/ring_buffer.c | 122 +++++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 119 insertions(+), 3 deletions(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 34e50c1..c99719e 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -353,6 +353,18 @@ static void free_buffer_page(struct buffer_page *bpage) kfree(bpage); } +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE +static void +free_buffer_page_cpu(struct buffer_page *bpage, int cpu, bool use_pstore) +{ + if (use_pstore) { + ramtrace_free_page(bpage->page, cpu); + kfree(bpage); + } else + free_buffer_page(bpage); +} +#endif + /* * We need to fit the time_stamp delta into 27 bits. */ @@ -1200,7 +1212,12 @@ static int rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer) return 0; } +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE +static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu, + bool use_pstore) +#else static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu) +#endif { struct buffer_page *bpage, *tmp; bool user_thread = current->mm != NULL; @@ -1214,6 +1231,11 @@ static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu) * to prevent doing any allocation when it is obvious that it is * not going to succeed. */ +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (use_pstore) + i = ramtrace_available_mem(); + else +#endif i = si_mem_available(); if (i < nr_pages) return -ENOMEM; @@ -1246,10 +1268,22 @@ static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu) list_add(&bpage->list, pages); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (use_pstore) { + void *address = ramtrace_alloc_page(cpu); + + if (!address) + goto free_pages; + bpage->page = address; + } else { +#endif page = alloc_pages_node(cpu_to_node(cpu), mflags, 0); if (!page) goto free_pages; bpage->page = page_address(page); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + } +#endif rb_init_page(bpage->page); if (user_thread && fatal_signal_pending(current)) @@ -1263,7 +1297,11 @@ static int __rb_allocate_pages(long nr_pages, struct list_head *pages, int cpu) free_pages: list_for_each_entry_safe(bpage, tmp, pages, list) { list_del_init(&bpage->list); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(bpage, cpu, use_pstore); +#else free_buffer_page(bpage); +#endif } if (user_thread) clear_current_oom_origin(); @@ -1278,7 +1316,12 @@ static int rb_allocate_pages(struct ring_buffer_per_cpu *cpu_buffer, WARN_ON(!nr_pages); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (__rb_allocate_pages(nr_pages, &pages, cpu_buffer->cpu, + cpu_buffer->use_pstore)) +#else if (__rb_allocate_pages(nr_pages, &pages, cpu_buffer->cpu)) +#endif return -ENOMEM; /* @@ -1414,10 +1457,23 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, long nr_pages, int cpu) rb_check_bpage(cpu_buffer, bpage); cpu_buffer->reader_page = bpage; + +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (cpu_buffer->use_pstore) { + void *address = ramtrace_alloc_page(cpu); + + if (!address) + goto fail_free_reader; + bpage->page = address; + } else { +#endif page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL, 0); if (!page) goto fail_free_reader; bpage->page = page_address(page); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + } +#endif rb_init_page(bpage->page); INIT_LIST_HEAD(&cpu_buffer->reader_page->list); @@ -1436,7 +1492,12 @@ rb_allocate_cpu_buffer(struct trace_buffer *buffer, long nr_pages, int cpu) return cpu_buffer; fail_free_reader: +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(cpu_buffer->reader_page, cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(cpu_buffer->reader_page); +#endif fail_free_buffer: kfree(cpu_buffer); @@ -1447,18 +1508,32 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer) { struct list_head *head = cpu_buffer->pages; struct buffer_page *bpage, *tmp; - +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(cpu_buffer->reader_page, cpu_buffer->cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(cpu_buffer->reader_page); +#endif rb_head_page_deactivate(cpu_buffer); if (head) { list_for_each_entry_safe(bpage, tmp, head, list) { list_del_init(&bpage->list); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(bpage, cpu_buffer->cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(bpage); +#endif } bpage = list_entry(head, struct buffer_page, list); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(bpage, cpu_buffer->cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(bpage); +#endif } kfree(cpu_buffer); @@ -1832,7 +1907,12 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned long nr_pages) * We have already removed references to this list item, just * free up the buffer_page and its page */ +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(to_remove_page, cpu_buffer->cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(to_remove_page); +#endif nr_removed--; } while (to_remove_page != last_page); @@ -1913,7 +1993,12 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer) list_for_each_entry_safe(bpage, tmp, &cpu_buffer->new_pages, list) { list_del_init(&bpage->list); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(bpage, cpu_buffer->cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(bpage); +#endif } } return success; @@ -2252,8 +2337,14 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, * allocated without receiving ENOMEM */ INIT_LIST_HEAD(&cpu_buffer->new_pages); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (__rb_allocate_pages(cpu_buffer->nr_pages_to_update, + &cpu_buffer->new_pages, cpu, + cpu_buffer->use_pstore)) { +#else if (__rb_allocate_pages(cpu_buffer->nr_pages_to_update, &cpu_buffer->new_pages, cpu)) { +#endif /* not enough memory for new pages */ err = -ENOMEM; goto out_err; @@ -2319,7 +2410,12 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, INIT_LIST_HEAD(&cpu_buffer->new_pages); if (cpu_buffer->nr_pages_to_update > 0 && __rb_allocate_pages(cpu_buffer->nr_pages_to_update, +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + &cpu_buffer->new_pages, cpu_id, + cpu_buffer->use_pstore)) { +#else &cpu_buffer->new_pages, cpu_id)) { +#endif err = -ENOMEM; goto out_err; } @@ -2379,7 +2475,12 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size, list_for_each_entry_safe(bpage, tmp, &cpu_buffer->new_pages, list) { list_del_init(&bpage->list); +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + free_buffer_page_cpu(bpage, cpu, + cpu_buffer->use_pstore); +#else free_buffer_page(bpage); +#endif } } out_err_unlock: @@ -5184,13 +5285,22 @@ void *ring_buffer_alloc_read_page(struct trace_buffer *buffer, int cpu) if (bpage) goto out; +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (cpu_buffer->use_pstore) { + bpage = (struct buffer_data_page *)ramtrace_alloc_page(cpu); + if (!bpage) + return ERR_PTR(-ENOMEM); + } else { +#endif page = alloc_pages_node(cpu_to_node(cpu), GFP_KERNEL | __GFP_NORETRY, 0); if (!page) return ERR_PTR(-ENOMEM); bpage = page_address(page); - +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + } +#endif out: rb_init_page(bpage); down_read(&trace_read_sem); @@ -5229,7 +5339,13 @@ void ring_buffer_free_read_page(struct trace_buffer *buffer, int cpu, void *data arch_spin_unlock(&cpu_buffer->lock); local_irq_restore(flags); - out: +out: +#ifdef CONFIG_TRACE_EVENTS_TO_PSTORE + if (cpu_buffer->use_pstore) { + ramtrace_free_page(bpage, cpu); + return; + } +#endif free_page((unsigned long)bpage); up_read(&trace_read_sem); } -- 2.7.4