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task_stack: uninline stack_not_used

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Given that stack_not_used() is not performance critical function
uninline it.

Link: https://lkml.kernel.org/r/20240730150158.832783-4-pasha.tatashin@soleen.com
Link: https://lkml.kernel.org/r/20240724203322.2765486-4-pasha.tatashin@soleen.com
Signed-off-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Acked-by: Shakeel Butt <shakeel.butt@linux.dev>
Cc: Domenico Cerasuolo <cerasuolodomenico@gmail.com>
Cc: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Li Zhijian <lizhijian@fujitsu.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Nhat Pham <nphamcs@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Pasha Tatashin 2024-07-24 20:33:22 +00:00 committed by Andrew Morton
parent c4a6fce856
commit fbe76a6557
3 changed files with 23 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
include/linux/sched/task_stack.h
View File

@ -95,23 +95,11 @@ static inline int object_is_on_stack(const void *obj)
extern void thread_stack_cache_init(void);
#ifdef CONFIG_DEBUG_STACK_USAGE
unsigned long stack_not_used(struct task_struct *p);
#else
static inline unsigned long stack_not_used(struct task_struct *p)
{
unsigned long *n = end_of_stack(p);
do { /* Skip over canary */
# ifdef CONFIG_STACK_GROWSUP
n--;
# else
n++;
# endif
} while (!*n);
# ifdef CONFIG_STACK_GROWSUP
return (unsigned long)end_of_stack(p) - (unsigned long)n;
# else
return (unsigned long)n - (unsigned long)end_of_stack(p);
# endif
return 0;
}
#endif
extern void set_task_stack_end_magic(struct task_struct *tsk);

19
kernel/exit.c
View File

@ -778,6 +778,25 @@ static void exit_notify(struct task_struct *tsk, int group_dead)
}
#ifdef CONFIG_DEBUG_STACK_USAGE
unsigned long stack_not_used(struct task_struct *p)
{
unsigned long *n = end_of_stack(p);
do { /* Skip over canary */
# ifdef CONFIG_STACK_GROWSUP
n--;
# else
n++;
# endif
} while (!*n);
# ifdef CONFIG_STACK_GROWSUP
return (unsigned long)end_of_stack(p) - (unsigned long)n;
# else
return (unsigned long)n - (unsigned long)end_of_stack(p);
# endif
}
/* Count the maximum pages reached in kernel stacks */
static inline void kstack_histogram(unsigned long used_stack)
{

4
kernel/sched/core.c
View File

@ -7405,7 +7405,7 @@ EXPORT_SYMBOL(io_schedule);
void sched_show_task(struct task_struct *p)
{
unsigned long free = 0;
unsigned long free;
int ppid;
if (!try_get_task_stack(p))
@ -7415,9 +7415,7 @@ void sched_show_task(struct task_struct *p)
if (task_is_running(p))
pr_cont(" running task ");
#ifdef CONFIG_DEBUG_STACK_USAGE
free = stack_not_used(p);
#endif
ppid = 0;
rcu_read_lock();
if (pid_alive(p))