From: Byungchul Park <byungchul.park@lge.com> To: peterz@infradead.org, mingo@kernel.org Cc: tglx@linutronix.de, walken@google.com, boqun.feng@gmail.com, kirill@shutemov.name, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, npiggin@gmail.com Subject: [PATCH v5 04/13] lockdep: Refactor save_trace() Date: Wed, 18 Jan 2017 22:17:30 +0900 [thread overview] Message-ID: <1484745459-2055-5-git-send-email-byungchul.park@lge.com> (raw) In-Reply-To: <1484745459-2055-1-git-send-email-byungchul.park@lge.com> Currently, save_trace() allocates a buffer for saving stack_trace from the global buffer, and then saves the trace. However, it would be more useful if a separate buffer can be used. Actually, crossrelease needs to use separate temporal buffers where to save stack_traces. Signed-off-by: Byungchul Park <byungchul.park@lge.com> --- kernel/locking/lockdep.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 2081c31..e63ff97 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -392,13 +392,13 @@ static void print_lockdep_off(const char *bug_msg) #endif } -static int save_trace(struct stack_trace *trace) +static unsigned int __save_trace(struct stack_trace *trace, unsigned long *buf, + unsigned long max_nr, int skip) { trace->nr_entries = 0; - trace->max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries; - trace->entries = stack_trace + nr_stack_trace_entries; - - trace->skip = 3; + trace->max_entries = max_nr; + trace->entries = buf; + trace->skip = skip; save_stack_trace(trace); @@ -415,7 +415,15 @@ static int save_trace(struct stack_trace *trace) trace->max_entries = trace->nr_entries; - nr_stack_trace_entries += trace->nr_entries; + return trace->nr_entries; +} + +static int save_trace(struct stack_trace *trace) +{ + unsigned long *buf = stack_trace + nr_stack_trace_entries; + unsigned long max_nr = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries; + + nr_stack_trace_entries += __save_trace(trace, buf, max_nr, 3); if (nr_stack_trace_entries >= MAX_STACK_TRACE_ENTRIES-1) { if (!debug_locks_off_graph_unlock()) -- 1.9.1
WARNING: multiple messages have this Message-ID (diff)
From: Byungchul Park <byungchul.park@lge.com> To: peterz@infradead.org, mingo@kernel.org Cc: tglx@linutronix.de, walken@google.com, boqun.feng@gmail.com, kirill@shutemov.name, linux-kernel@vger.kernel.org, linux-mm@kvack.org, iamjoonsoo.kim@lge.com, akpm@linux-foundation.org, npiggin@gmail.com Subject: [PATCH v5 04/13] lockdep: Refactor save_trace() Date: Wed, 18 Jan 2017 22:17:30 +0900 [thread overview] Message-ID: <1484745459-2055-5-git-send-email-byungchul.park@lge.com> (raw) In-Reply-To: <1484745459-2055-1-git-send-email-byungchul.park@lge.com> Currently, save_trace() allocates a buffer for saving stack_trace from the global buffer, and then saves the trace. However, it would be more useful if a separate buffer can be used. Actually, crossrelease needs to use separate temporal buffers where to save stack_traces. Signed-off-by: Byungchul Park <byungchul.park@lge.com> --- kernel/locking/lockdep.c | 20 ++++++++++++++------ 1 file changed, 14 insertions(+), 6 deletions(-) diff --git a/kernel/locking/lockdep.c b/kernel/locking/lockdep.c index 2081c31..e63ff97 100644 --- a/kernel/locking/lockdep.c +++ b/kernel/locking/lockdep.c @@ -392,13 +392,13 @@ static void print_lockdep_off(const char *bug_msg) #endif } -static int save_trace(struct stack_trace *trace) +static unsigned int __save_trace(struct stack_trace *trace, unsigned long *buf, + unsigned long max_nr, int skip) { trace->nr_entries = 0; - trace->max_entries = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries; - trace->entries = stack_trace + nr_stack_trace_entries; - - trace->skip = 3; + trace->max_entries = max_nr; + trace->entries = buf; + trace->skip = skip; save_stack_trace(trace); @@ -415,7 +415,15 @@ static int save_trace(struct stack_trace *trace) trace->max_entries = trace->nr_entries; - nr_stack_trace_entries += trace->nr_entries; + return trace->nr_entries; +} + +static int save_trace(struct stack_trace *trace) +{ + unsigned long *buf = stack_trace + nr_stack_trace_entries; + unsigned long max_nr = MAX_STACK_TRACE_ENTRIES - nr_stack_trace_entries; + + nr_stack_trace_entries += __save_trace(trace, buf, max_nr, 3); if (nr_stack_trace_entries >= MAX_STACK_TRACE_ENTRIES-1) { if (!debug_locks_off_graph_unlock()) -- 1.9.1 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2017-01-18 13:18 UTC|newest] Thread overview: 124+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-01-18 13:17 [PATCH v5 00/13] lockdep: Implement crossrelease feature Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 01/13] lockdep: Refactor lookup_chain_cache() Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-19 9:16 ` Boqun Feng 2017-01-19 9:52 ` Byungchul Park 2017-01-19 9:52 ` Byungchul Park 2017-01-26 7:53 ` Byungchul Park 2017-01-26 7:53 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 02/13] lockdep: Fix wrong condition to print bug msgs for MAX_LOCKDEP_CHAIN_HLOCKS Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 03/13] lockdep: Add a function building a chain between two classes Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` Byungchul Park [this message] 2017-01-18 13:17 ` [PATCH v5 04/13] lockdep: Refactor save_trace() Byungchul Park 2017-01-18 13:17 ` [PATCH v5 05/13] lockdep: Pass a callback arg to check_prev_add() to handle stack_trace Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-26 7:43 ` Byungchul Park 2017-01-26 7:43 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 06/13] lockdep: Implement crossrelease feature Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-02-28 12:26 ` Peter Zijlstra 2017-02-28 12:26 ` Peter Zijlstra 2017-02-28 12:45 ` Peter Zijlstra 2017-02-28 12:45 ` Peter Zijlstra 2017-02-28 12:49 ` Peter Zijlstra 2017-02-28 12:49 ` Peter Zijlstra 2017-03-01 6:20 ` Byungchul Park 2017-03-01 6:20 ` Byungchul Park 2017-02-28 13:05 ` Peter Zijlstra 2017-02-28 13:05 ` Peter Zijlstra 2017-02-28 13:28 ` Byungchul Park 2017-02-28 13:28 ` Byungchul Park 2017-02-28 13:35 ` Peter Zijlstra 2017-02-28 13:35 ` Peter Zijlstra 2017-02-28 14:00 ` Byungchul Park 2017-02-28 14:00 ` Byungchul Park 2017-02-28 13:10 ` Peter Zijlstra 2017-02-28 13:10 ` Peter Zijlstra 2017-02-28 13:24 ` Byungchul Park 2017-02-28 13:24 ` Byungchul Park 2017-02-28 18:29 ` Peter Zijlstra 2017-02-28 18:29 ` Peter Zijlstra 2017-03-01 4:40 ` Byungchul Park 2017-03-01 4:40 ` Byungchul Park 2017-03-01 10:45 ` Peter Zijlstra 2017-03-01 10:45 ` Peter Zijlstra 2017-03-01 12:10 ` Byungchul Park 2017-03-01 12:10 ` Byungchul Park 2017-02-28 13:40 ` Peter Zijlstra 2017-02-28 13:40 ` Peter Zijlstra 2017-03-01 5:43 ` Byungchul Park 2017-03-01 5:43 ` Byungchul Park 2017-03-01 12:28 ` Peter Zijlstra 2017-03-01 12:28 ` Peter Zijlstra 2017-03-02 13:40 ` Peter Zijlstra 2017-03-02 13:40 ` Peter Zijlstra 2017-03-03 0:17 ` Byungchul Park 2017-03-03 0:17 ` Byungchul Park 2017-03-03 8:14 ` Peter Zijlstra 2017-03-03 8:14 ` Peter Zijlstra 2017-03-03 9:13 ` Peter Zijlstra 2017-03-03 9:13 ` Peter Zijlstra 2017-03-03 9:32 ` Peter Zijlstra 2017-03-03 9:32 ` Peter Zijlstra 2017-03-05 3:33 ` Byungchul Park 2017-03-05 3:33 ` Byungchul Park 2017-08-10 12:18 ` [tip:locking/core] locking/lockdep: Avoid creating redundant links tip-bot for Peter Zijlstra 2017-03-05 3:08 ` [PATCH v5 06/13] lockdep: Implement crossrelease feature Byungchul Park 2017-03-05 3:08 ` Byungchul Park 2017-03-07 11:42 ` Peter Zijlstra 2017-03-07 11:42 ` Peter Zijlstra 2017-03-03 0:39 ` Byungchul Park 2017-03-03 0:39 ` Byungchul Park 2017-02-28 15:49 ` Peter Zijlstra 2017-02-28 15:49 ` Peter Zijlstra 2017-03-01 5:17 ` Byungchul Park 2017-03-01 5:17 ` Byungchul Park 2017-03-01 6:18 ` Byungchul Park 2017-03-01 6:18 ` Byungchul Park 2017-03-02 2:52 ` Byungchul Park 2017-03-02 2:52 ` Byungchul Park 2017-02-28 18:15 ` Peter Zijlstra 2017-02-28 18:15 ` Peter Zijlstra 2017-03-01 7:21 ` Byungchul Park 2017-03-01 7:21 ` Byungchul Park 2017-03-01 10:43 ` Peter Zijlstra 2017-03-01 10:43 ` Peter Zijlstra 2017-03-01 12:27 ` Byungchul Park 2017-03-01 12:27 ` Byungchul Park 2017-03-02 4:20 ` Matthew Wilcox 2017-03-02 4:20 ` Matthew Wilcox 2017-03-02 4:45 ` byungchul.park 2017-03-02 4:45 ` byungchul.park 2017-03-02 14:39 ` Matthew Wilcox 2017-03-02 14:39 ` Matthew Wilcox 2017-03-02 23:50 ` Byungchul Park 2017-03-02 23:50 ` Byungchul Park 2017-03-05 8:01 ` Byungchul Park 2017-03-05 8:01 ` Byungchul Park 2017-03-14 7:36 ` Byungchul Park 2017-03-14 7:36 ` Byungchul Park 2017-03-02 13:41 ` Peter Zijlstra 2017-03-02 13:41 ` Peter Zijlstra 2017-03-02 23:43 ` Byungchul Park 2017-03-02 23:43 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 07/13] lockdep: Make print_circular_bug() aware of crossrelease Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 08/13] lockdep: Apply crossrelease to completions Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 09/13] pagemap.h: Remove trailing white space Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 10/13] lockdep: Apply crossrelease to PG_locked locks Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 11/13] lockdep: Apply lock_acquire(release) on __Set(__Clear)PageLocked Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 12/13] lockdep: Move data of CONFIG_LOCKDEP_PAGELOCK from page to page_ext Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-18 13:17 ` [PATCH v5 13/13] lockdep: Crossrelease feature documentation Byungchul Park 2017-01-18 13:17 ` Byungchul Park 2017-01-20 9:08 ` [REVISED DOCUMENT] " Byungchul Park 2017-01-20 9:08 ` Byungchul Park 2017-02-20 8:38 ` [PATCH v5 00/13] lockdep: Implement crossrelease feature Byungchul Park 2017-02-20 8:38 ` Byungchul Park
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