FM / runtime

/usr/share/systemtap/runtime

Name	Size	Mode	Actions
dyninst/	-	0755	rm
linux/	-	0755	rm
softfloat/	-	0755	rm
transport/	-	0755	rm
unwind/	-	0755	rm
addr-map.c	523	0644	edit dl rm
addr-map.h	1156	0644	edit dl rm
alloc.c	498	0644	edit dl rm
arith.c	483	0644	edit dl rm
common_probe_context.h	6576	0644	edit dl rm
common_session_state.h	415	0644	edit dl rm
compatdefs.h	3682	0644	edit dl rm
copy.c	585	0644	edit dl rm
debug.h	485	0644	edit dl rm
io.c	508	0644	edit dl rm
k_syms.h	182	0644	edit dl rm
loc2c-runtime.h	17937	0644	edit dl rm
map-gen.c	25977	0644	edit dl rm
map-stat.c	3589	0644	edit dl rm
map.c	14660	0644	edit dl rm
map.h	5918	0644	edit dl rm
mempool.c	2644	0644	edit dl rm
namespaces.h	487	0644	edit dl rm
pmap-gen.c	8710	0644	edit dl rm
print.c	486	0644	edit dl rm
print.h	872	0644	edit dl rm
print_flush.c	3073	0644	edit dl rm
probe_lock.h	498	0644	edit dl rm
procfs-probes.c	4673	0644	edit dl rm
procfs-probes.h	674	0644	edit dl rm
procfs.c	4021	0644	edit dl rm
proc_fs_compatibility.h	2316	0644	edit dl rm
ptrace_compatibility.h	1512	0644	edit dl rm
regs.c	4280	0644	edit dl rm
regs.h	2352	0644	edit dl rm
runtime.h	928	0644	edit dl rm
runtime_context.h	669	0644	edit dl rm
runtime_defines.h	3582	0644	edit dl rm
softfloat.c	77159	0644	edit dl rm
softfloat.h	5125	0644	edit dl rm
stack-arm.c	1688	0644	edit dl rm
stack-ia64.c	1083	0644	edit dl rm
stack-mips.c	125	0644	edit dl rm
stack-s390.c	2362	0644	edit dl rm
stack.c	21790	0644	edit dl rm
stat-common.c	8486	0644	edit dl rm
stat.c	7421	0644	edit dl rm
stat.h	1964	0644	edit dl rm
stp_helper_lock.h	3669	0644	edit dl rm
stp_string.c	8632	0644	edit dl rm
stp_string.h	598	0644	edit dl rm
stp_task_work.c	3511	0644	edit dl rm
stp_utrace.c	94735	0644	edit dl rm
stp_utrace.h	14010	0644	edit dl rm
sym.c	39757	0644	edit dl rm
sym.h	6539	0644	edit dl rm
syscall.h	17408	0644	edit dl rm
task_finder_vma.c	13290	0644	edit dl rm
time.c	14887	0644	edit dl rm
timer.c	481	0644	edit dl rm
timer.h	482	0644	edit dl rm
uidgid_compatibility.h	603	0644	edit dl rm
unwind.c	47890	0644	edit dl rm
utrace_compatibility.h	3148	0644	edit dl rm
vma.c	9545	0644	edit dl rm
vsprintf.c	24058	0644	edit dl rm
vsprintf.h	1502	0644	edit dl rm

Edit: /usr/share/systemtap/runtime/mempool.c (2644B)

/*  -*- linux-c -*-
 * Preallocated memory pools
 * Copyright (C) 2008-2009 Red Hat Inc.
 *
 * This file is part of systemtap, and is free software.  You can
 * redistribute it and/or modify it under the terms of the GNU General
 * Public License (GPL); either version 2, or (at your option) any
 * later version.
 */

#ifndef _STP_MEMPOOL_C_
#define _STP_MEMPOOL_C_

/* An opaque struct identifying the memory pool. */
typedef struct {
	struct list_head free_list;
	unsigned num;
	unsigned size;
	stp_spinlock_t lock;
} _stp_mempool_t;

/* for internal use only */
struct _stp_mem_buffer {
	struct list_head list;
	_stp_mempool_t *pool;
	void *buf;
};

/* Delete a memory pool */
static void _stp_mempool_destroy(_stp_mempool_t *pool)
{
	struct list_head *p, *tmp;
	if (pool) {
		list_for_each_safe(p, tmp, &pool->free_list) {
			list_del(p);
			_stp_vfree(p);
		}
		_stp_kfree(pool);
	}
}

/* Create a new memory pool */
static _stp_mempool_t *_stp_mempool_init(size_t size, size_t num)
{
	int i, alloc_size;
	struct _stp_mem_buffer *m;

_stp_mempool_t *pool = (_stp_mempool_t *)_stp_kmalloc(sizeof(_stp_mempool_t));
	if (unlikely(pool == NULL)) {
		errk("Memory allocation failed.\n");
		return NULL;
	}

INIT_LIST_HEAD(&pool->free_list);
	stp_spin_lock_init(&pool->lock);

alloc_size = size + sizeof(struct _stp_mem_buffer) - sizeof(void *);

for (i = 0; i < num; i++) {
		m = (struct _stp_mem_buffer *)_stp_vzalloc(alloc_size);
		if (unlikely(m == NULL))
			goto err;
		m->pool = pool;
		list_add((struct list_head *)m, &pool->free_list);
	}
	pool->num = num;
	pool->size = alloc_size;
	return pool;

err:
	_stp_mempool_destroy(pool);
	return NULL;
}

/* allocate a buffer from a memory pool */
static void *_stp_mempool_alloc(_stp_mempool_t *pool)
{
	unsigned long flags;
	struct _stp_mem_buffer *ptr = NULL;
        /* PR14804: tolerate accidental early call, before pool is
         actually initialized. */
        if (pool == NULL)
                return NULL;
	stp_spin_lock_irqsave(&pool->lock, flags);
	if (likely(!list_empty(&pool->free_list))) {
		ptr = (struct _stp_mem_buffer *)pool->free_list.next;
		list_del_init(&ptr->list);
		stp_spin_unlock_irqrestore(&pool->lock, flags);
		return &ptr->buf;
	}
	stp_spin_unlock_irqrestore(&pool->lock, flags);
	return NULL;
}

/* return a buffer to its memory pool */
static void _stp_mempool_free(void *buf)
{
	unsigned long flags;
	struct _stp_mem_buffer *m = container_of(buf, struct _stp_mem_buffer, buf);
	stp_spin_lock_irqsave(&m->pool->lock, flags);
	list_add(&m->list, &m->pool->free_list);
	stp_spin_unlock_irqrestore(&m->pool->lock, flags);
}
#endif /* _STP_MEMPOOL_C_ */

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