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alloc_tag: introduce shutdown_mem_profiling helper function

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Implement a helper function to disable memory allocation profiling and use
it when creation of /proc/allocinfo fails.  Ensure /proc/allocinfo does
not get created when memory allocation profiling is disabled.

Link: https://lkml.kernel.org/r/20241023170759.999909-3-surenb@google.com
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Daniel Gomez <da.gomez@samsung.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Davidlohr Bueso <dave@stgolabs.net>
Cc: David Rientjes <rientjes@google.com>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Kalesh Singh <kaleshsingh@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Liam R. Howlett <Liam.Howlett@Oracle.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport (Microsoft) <rppt@kernel.org>
Cc: Minchan Kim <minchan@google.com>
Cc: Paul E. McKenney <paulmck@kernel.org>
Cc: Petr Pavlu <petr.pavlu@suse.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Sami Tolvanen <samitolvanen@google.com>
Cc: Sourav Panda <souravpanda@google.com>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thomas Huth <thuth@redhat.com>
Cc: Uladzislau Rezki (Sony) <urezki@gmail.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Xiongwei Song <xiongwei.song@windriver.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Suren Baghdasaryan 2024-10-23 10:07:55 -07:00 committed by Andrew Morton
parent 7c8c76e446
commit 3e09c500bb
1 changed files with 26 additions and 7 deletions
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33
lib/alloc_tag.c
View File

@ -8,6 +8,14 @@
#include <linux/seq_buf.h>
#include <linux/seq_file.h>
#define ALLOCINFO_FILE_NAME "allocinfo"
#ifdef CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
static bool mem_profiling_support __meminitdata = true;
#else
static bool mem_profiling_support __meminitdata;
#endif
static struct codetag_type *alloc_tag_cttype;
DEFINE_PER_CPU(struct alloc_tag_counters, _shared_alloc_tag);
@ -144,9 +152,26 @@ size_t alloc_tag_top_users(struct codetag_bytes *tags, size_t count, bool can_sl
return nr;
}
static void __init shutdown_mem_profiling(void)
{
if (mem_alloc_profiling_enabled())
static_branch_disable(&mem_alloc_profiling_key);
if (!mem_profiling_support)
return;
mem_profiling_support = false;
}
static void __init procfs_init(void)
{
proc_create_seq("allocinfo", 0400, NULL, &allocinfo_seq_op);
if (!mem_profiling_support)
return;
if (!proc_create_seq(ALLOCINFO_FILE_NAME, 0400, NULL, &allocinfo_seq_op)) {
pr_err("Failed to create %s file\n", ALLOCINFO_FILE_NAME);
shutdown_mem_profiling();
}
}
static bool alloc_tag_module_unload(struct codetag_type *cttype,
@ -174,12 +199,6 @@ static bool alloc_tag_module_unload(struct codetag_type *cttype,
return module_unused;
}
#ifdef CONFIG_MEM_ALLOC_PROFILING_ENABLED_BY_DEFAULT
static bool mem_profiling_support __meminitdata = true;
#else
static bool mem_profiling_support __meminitdata;
#endif
static int __init setup_early_mem_profiling(char *str)
{
bool enable;