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