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bootmem: add debugging framework

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Introduce the bootmem_debug kernel parameter that enables very verbose
diagnostics regarding all range operations of bootmem as well as the
initialization and release of nodes.

[akpm@linux-foundation.org: fix printk warnings]
Signed-off-by: Johannes Weiner <hannes@saeurebad.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Weiner 2008-07-23 21:28:02 -07:00 committed by Linus Torvalds
parent a66fd7daec
commit 2e5237daf0
1 changed files with 44 additions and 7 deletions
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51
mm/bootmem.c
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@ -34,6 +34,22 @@ unsigned long saved_max_pfn;
bootmem_data_t bootmem_node_data[MAX_NUMNODES] __initdata;
static int bootmem_debug;
static int __init bootmem_debug_setup(char *buf)
{
bootmem_debug = 1;
return 0;
}
early_param("bootmem_debug", bootmem_debug_setup);
#define bdebug(fmt, args...) ({ \
if (unlikely(bootmem_debug)) \
printk(KERN_INFO \
"bootmem::%s " fmt, \
__FUNCTION__, ## args); \
})
/*
* Given an initialised bdata, it returns the size of the boot bitmap
*/
@ -104,6 +120,9 @@ static unsigned long __init init_bootmem_core(bootmem_data_t *bdata,
mapsize = get_mapsize(bdata);
memset(bdata->node_bootmem_map, 0xff, mapsize);
bdebug("nid=%td start=%lx map=%lx end=%lx mapsize=%lx\n",
bdata - bootmem_node_data, start, mapstart, end, mapsize);
return mapsize;
}
@ -198,6 +217,8 @@ static unsigned long __init free_all_bootmem_core(bootmem_data_t *bdata)
count += i;
bdata->node_bootmem_map = NULL;
bdebug("nid=%td released=%lx\n", bdata - bootmem_node_data, count);
return count;
}
@ -255,6 +276,10 @@ static void __init free_bootmem_core(bootmem_data_t *bdata, unsigned long addr,
if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
bdebug("nid=%td start=%lx end=%lx\n", bdata - bootmem_node_data,
sidx + PFN_DOWN(bdata->node_boot_start),
eidx + PFN_DOWN(bdata->node_boot_start));
for (i = sidx; i < eidx; i++) {
if (unlikely(!test_and_clear_bit(i, bdata->node_bootmem_map)))
BUG();
@ -360,13 +385,16 @@ static void __init reserve_bootmem_core(bootmem_data_t *bdata,
if (eidx > bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start))
eidx = bdata->node_low_pfn - PFN_DOWN(bdata->node_boot_start);
for (i = sidx; i < eidx; i++) {
if (test_and_set_bit(i, bdata->node_bootmem_map)) {
#ifdef CONFIG_DEBUG_BOOTMEM
printk("hm, page %08lx reserved twice.\n", i*PAGE_SIZE);
#endif
}
}
bdebug("nid=%td start=%lx end=%lx flags=%x\n",
bdata - bootmem_node_data,
sidx + PFN_DOWN(bdata->node_boot_start),
eidx + PFN_DOWN(bdata->node_boot_start),
flags);
for (i = sidx; i < eidx; i++)
if (test_and_set_bit(i, bdata->node_bootmem_map))
bdebug("hm, page %lx reserved twice.\n",
PFN_DOWN(bdata->node_boot_start) + i);
}
/**
@ -455,6 +483,10 @@ alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size,
if (!bdata->node_bootmem_map)
return NULL;
bdebug("nid=%td size=%lx [%lu pages] align=%lx goal=%lx limit=%lx\n",
bdata - bootmem_node_data, size, PAGE_ALIGN(size) >> PAGE_SHIFT,
align, goal, limit);
/* bdata->node_boot_start is supposed to be (12+6)bits alignment on x86_64 ? */
node_boot_start = bdata->node_boot_start;
node_bootmem_map = bdata->node_bootmem_map;
@ -562,6 +594,11 @@ alloc_bootmem_core(struct bootmem_data *bdata, unsigned long size,
ret = phys_to_virt(start * PAGE_SIZE + node_boot_start);
}
bdebug("nid=%td start=%lx end=%lx\n",
bdata - bootmem_node_data,
start + PFN_DOWN(bdata->node_boot_start),
start + areasize + PFN_DOWN(bdata->node_boot_start));
/*
* Reserve the area now:
*/