On 09/09/2007 04:33 PM, Andi Kleen wrote:
> On Sun, Sep 09, 2007 at 04:26:22PM +0200, Jiri Slaby wrote:
>> BTW it is reproducible for me on two different machines (i386-x86_64,
>> radeon-intel), don't you have the problem too?
>
> No problems here with a radeon, no.
>
> Does your CPU have clflush or not in /proc/cpuinfo?
BTW this is how my flush_kernel_map looks like:
static void flush_kernel_map(void *arg)
{
struct flush_arg *a = (struct flush_arg *)arg;
struct page *pg;
unsigned int xx = 0;
/* When clflush is available use it because it is
much cheaper than WBINVD. */
printk("%s: 1\n", __func__);
if (a->full_flush || !cpu_has_clflush)
asm volatile("wbinvd" ::: "memory");
else list_for_each_entry(pg, &a->l, lru) {
printk("%s: %10u 1a\n", __func__, xx++);
if (PageFlush(pg))
clflush_cache_range(page_address(pg), PAGE_SIZE);
}
printk("%s: 2\n", __func__);
__flush_tlb_all();
printk("%s: 3\n", __func__);
}
It outputs 1a in the infinite loop with incrementing xx. But only in this case,
some global_flush_tlb are OK. e.g.:
Sep 10 01:39:19 localhost kernel: agpgart: Detected an Intel G33 Chipset.
Sep 10 01:39:19 localhost kernel: global_flush_tlb: 1
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 1
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 0 1a
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 1 1a
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 2
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 3
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 1
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 0 1a
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 1 1a
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 2
Sep 10 01:39:19 localhost kernel: flush_kernel_map: 3
Sep 10 01:39:19 localhost kernel: global_flush_tlb: 2
Sep 10 01:39:19 localhost kernel: global_flush_tlb: 3
Sep 10 01:39:19 localhost kernel: agpgart: Detected 6140K stolen memory.
It seems, that the list is broken only on X shutdown. How can be deferred-pages
list inited in some bad manner, when list_replace_init is called on it? Weird.
--
Jiri Slaby ([email protected])
Faculty of Informatics, Masaryk University
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