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Message-ID: <20241022023003.156847915@goodmis.org>
Date: Mon, 21 Oct 2024 22:29:20 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: linux-kernel@...r.kernel.org
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Petr Pavlu <petr.pavlu@...e.com>
Subject: [for-next][PATCH v2 1/3] ring-buffer: Limit time with disabled interrupts in rb_check_pages()
From: Petr Pavlu <petr.pavlu@...e.com>
The function rb_check_pages() validates the integrity of a specified
per-CPU tracing ring buffer. It does so by traversing the underlying
linked list and checking its next and prev links.
To guarantee that the list isn't modified during the check, a caller
typically needs to take cpu_buffer->reader_lock. This prevents the check
from running concurrently, for example, with a potential reader which
can make the list temporarily inconsistent when swapping its old reader
page into the buffer.
A problem with this approach is that the time when interrupts are
disabled is non-deterministic, dependent on the ring buffer size. This
particularly affects PREEMPT_RT because the reader_lock is a raw
spinlock which doesn't become sleepable on PREEMPT_RT kernels.
Modify the check so it still attempts to traverse the entire list, but
gives up the reader_lock between checking individual pages. Introduce
for this purpose a new variable ring_buffer_per_cpu.cnt which is bumped
any time the list is modified. The value is used by rb_check_pages() to
detect such a change and restart the check.
Cc: Masami Hiramatsu <mhiramat@...nel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Link: https://lore.kernel.org/20241015112810.27203-1-petr.pavlu@suse.com
Signed-off-by: Petr Pavlu <petr.pavlu@...e.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@...dmis.org>
---
kernel/trace/ring_buffer.c | 98 ++++++++++++++++++++++++++++----------
1 file changed, 72 insertions(+), 26 deletions(-)
diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index 3ea4f7bb1837..adde95400ab4 100644
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -482,6 +482,8 @@ struct ring_buffer_per_cpu {
unsigned long nr_pages;
unsigned int current_context;
struct list_head *pages;
+ /* pages generation counter, incremented when the list changes */
+ unsigned long cnt;
struct buffer_page *head_page; /* read from head */
struct buffer_page *tail_page; /* write to tail */
struct buffer_page *commit_page; /* committed pages */
@@ -1475,40 +1477,87 @@ static void rb_check_bpage(struct ring_buffer_per_cpu *cpu_buffer,
RB_WARN_ON(cpu_buffer, val & RB_FLAG_MASK);
}
+static bool rb_check_links(struct ring_buffer_per_cpu *cpu_buffer,
+ struct list_head *list)
+{
+ if (RB_WARN_ON(cpu_buffer,
+ rb_list_head(rb_list_head(list->next)->prev) != list))
+ return false;
+
+ if (RB_WARN_ON(cpu_buffer,
+ rb_list_head(rb_list_head(list->prev)->next) != list))
+ return false;
+
+ return true;
+}
+
/**
* rb_check_pages - integrity check of buffer pages
* @cpu_buffer: CPU buffer with pages to test
*
* As a safety measure we check to make sure the data pages have not
* been corrupted.
- *
- * Callers of this function need to guarantee that the list of pages doesn't get
- * modified during the check. In particular, if it's possible that the function
- * is invoked with concurrent readers which can swap in a new reader page then
- * the caller should take cpu_buffer->reader_lock.
*/
static void rb_check_pages(struct ring_buffer_per_cpu *cpu_buffer)
{
- struct list_head *head = rb_list_head(cpu_buffer->pages);
- struct list_head *tmp;
+ struct list_head *head, *tmp;
+ unsigned long buffer_cnt;
+ unsigned long flags;
+ int nr_loops = 0;
- if (RB_WARN_ON(cpu_buffer,
- rb_list_head(rb_list_head(head->next)->prev) != head))
+ /*
+ * Walk the linked list underpinning the ring buffer and validate all
+ * its next and prev links.
+ *
+ * The check acquires the reader_lock to avoid concurrent processing
+ * with code that could be modifying the list. However, the lock cannot
+ * be held for the entire duration of the walk, as this would make the
+ * time when interrupts are disabled non-deterministic, dependent on the
+ * ring buffer size. Therefore, the code releases and re-acquires the
+ * lock after checking each page. The ring_buffer_per_cpu.cnt variable
+ * is then used to detect if the list was modified while the lock was
+ * not held, in which case the check needs to be restarted.
+ *
+ * The code attempts to perform the check at most three times before
+ * giving up. This is acceptable because this is only a self-validation
+ * to detect problems early on. In practice, the list modification
+ * operations are fairly spaced, and so this check typically succeeds at
+ * most on the second try.
+ */
+again:
+ if (++nr_loops > 3)
return;
- if (RB_WARN_ON(cpu_buffer,
- rb_list_head(rb_list_head(head->prev)->next) != head))
- return;
+ raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
+ head = rb_list_head(cpu_buffer->pages);
+ if (!rb_check_links(cpu_buffer, head))
+ goto out_locked;
+ buffer_cnt = cpu_buffer->cnt;
+ tmp = head;
+ raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
- for (tmp = rb_list_head(head->next); tmp != head; tmp = rb_list_head(tmp->next)) {
- if (RB_WARN_ON(cpu_buffer,
- rb_list_head(rb_list_head(tmp->next)->prev) != tmp))
- return;
+ while (true) {
+ raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
- if (RB_WARN_ON(cpu_buffer,
- rb_list_head(rb_list_head(tmp->prev)->next) != tmp))
- return;
+ if (buffer_cnt != cpu_buffer->cnt) {
+ /* The list was updated, try again. */
+ raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
+ goto again;
+ }
+
+ tmp = rb_list_head(tmp->next);
+ if (tmp == head)
+ /* The iteration circled back, all is done. */
+ goto out_locked;
+
+ if (!rb_check_links(cpu_buffer, tmp))
+ goto out_locked;
+
+ raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
}
+
+out_locked:
+ raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
}
/*
@@ -2535,6 +2584,7 @@ rb_remove_pages(struct ring_buffer_per_cpu *cpu_buffer, unsigned long nr_pages)
/* make sure pages points to a valid page in the ring buffer */
cpu_buffer->pages = next_page;
+ cpu_buffer->cnt++;
/* update head page */
if (head_bit)
@@ -2641,6 +2691,7 @@ rb_insert_pages(struct ring_buffer_per_cpu *cpu_buffer)
* pointer to point to end of list
*/
head_page->prev = last_page;
+ cpu_buffer->cnt++;
success = true;
break;
}
@@ -2876,12 +2927,8 @@ int ring_buffer_resize(struct trace_buffer *buffer, unsigned long size,
*/
synchronize_rcu();
for_each_buffer_cpu(buffer, cpu) {
- unsigned long flags;
-
cpu_buffer = buffer->buffers[cpu];
- raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
rb_check_pages(cpu_buffer);
- raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
}
atomic_dec(&buffer->record_disabled);
}
@@ -5299,6 +5346,7 @@ rb_get_reader_page(struct ring_buffer_per_cpu *cpu_buffer)
rb_list_head(reader->list.next)->prev = &cpu_buffer->reader_page->list;
rb_inc_page(&cpu_buffer->head_page);
+ cpu_buffer->cnt++;
local_inc(&cpu_buffer->pages_read);
/* Finally update the reader page to the new head */
@@ -5838,12 +5886,9 @@ void
ring_buffer_read_finish(struct ring_buffer_iter *iter)
{
struct ring_buffer_per_cpu *cpu_buffer = iter->cpu_buffer;
- unsigned long flags;
/* Use this opportunity to check the integrity of the ring buffer. */
- raw_spin_lock_irqsave(&cpu_buffer->reader_lock, flags);
rb_check_pages(cpu_buffer);
- raw_spin_unlock_irqrestore(&cpu_buffer->reader_lock, flags);
atomic_dec(&cpu_buffer->resize_disabled);
kfree(iter->event);
@@ -6760,6 +6805,7 @@ int ring_buffer_subbuf_order_set(struct trace_buffer *buffer, int order)
/* Install the new pages, remove the head from the list */
cpu_buffer->pages = cpu_buffer->new_pages.next;
list_del_init(&cpu_buffer->new_pages);
+ cpu_buffer->cnt++;
cpu_buffer->head_page
= list_entry(cpu_buffer->pages, struct buffer_page, list);
--
2.45.2
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