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SubjectRE: [Patch] Move swiotlb_init early on X86_64
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On Thu, 2006-03-02 at 17:09, Zhang, Yanmin wrote:
> >>-----Original Message-----
> >>From: linux-kernel-owner@vger.kernel.org [mailto:linux-kernel-owner@vger.kernel.org] On Behalf Of Zou Nan hai
> >>Sent: 2006年3月2日 12:33
> >>
> >>Really, then how about the following patch?
> >>
> >>Let normal bootmem allocator go above 4G first.
> >>This will save more memory with address less than 4G.
> >>
> >>Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
> >>
> >>--- linux-2.6.16-rc5/mm/bootmem.c 2006-03-03 08:31:52.000000000 +0800
> >>+++ b/mm/bootmem.c 2006-03-03 09:05:17.000000000 +0800
> >>@@ -381,16 +381,24 @@ unsigned long __init free_all_bootmem (v
> >> return(free_all_bootmem_core(NODE_DATA(0)));
> >> }
> >>
> >>+#define LOW32LIMIT 0xffffffff
> >>+
> >> void * __init __alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal)
> >> {
> >> pg_data_t *pgdat = pgdat_list;
> >> void *ptr;
> >>
> >>+ if (goal < LOW32LIMIT) {
> On i386, above is always true.
>
>

Ok, I modified the patch.

On single node SMP System with large physical memory,
allocation from bootmem allocator like memmap and vfs_cache
may eat up usable memory under 4G, then software I/O TLB will not be able to allocate bounce buffer.

This patch modify the bootmem allocator,
let normal bootmem allocation on 64 bit system first go above 4G
address.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>

--- linux-2.6.16-rc5/mm/bootmem.c 2006-03-03 08:31:52.000000000 +0800
+++ b/mm/bootmem.c 2006-03-04 03:48:55.000000000 +0800
@@ -381,16 +381,25 @@ unsigned long __init free_all_bootmem (v
return(free_all_bootmem_core(NODE_DATA(0)));
}

+#define LOW32LIMIT 0xffffffff
+
void * __init __alloc_bootmem(unsigned long size, unsigned long align, unsigned long goal)
{
pg_data_t *pgdat = pgdat_list;
void *ptr;

+#if (BITS_PER_LONG == 64)
+ if (goal < LOW32LIMIT) {
+ for_each_pgdat(pgdat)
+ if ((ptr = __alloc_bootmem_core(pgdat->bdata, size,
+ align, LOW32LIMIT, 0)))
+ return(ptr);
+ }
+#endif
for_each_pgdat(pgdat)
if ((ptr = __alloc_bootmem_core(pgdat->bdata, size,
align, goal, 0)))
return(ptr);
-
/*
* Whoops, we cannot satisfy the allocation request.
*/
@@ -404,6 +413,14 @@ void * __init __alloc_bootmem_node(pg_da
unsigned long goal)
{
void *ptr;
+#if (BITS_PER_LONG == 64)
+ if (goal < LOW32LIMIT) {
+ ptr = __alloc_bootmem_core(pgdat->bdata, size, align,
+ LOW32LIMIT, 0);
+ if (ptr)
+ return (ptr);
+ }
+#endif

ptr = __alloc_bootmem_core(pgdat->bdata, size, align, goal, 0);
if (ptr)
@@ -412,7 +429,6 @@ void * __init __alloc_bootmem_node(pg_da
return __alloc_bootmem(size, align, goal);
}

-#define LOW32LIMIT 0xffffffff

void * __init __alloc_bootmem_low(unsigned long size, unsigned long align, unsigned long goal)
{







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