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Date: Fri, 26 Sep 2008 19:55:35 -0700
From: Yinghai Lu <yhlu.kernel@...il.com>
To: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
"H. Peter Anvin" <hpa@...or.com>,
Andrew Morton <akpm@...ux-foundation.org>
Cc: linux-kernel@...r.kernel.org, Yinghai Lu <yhlu.kernel@...il.com>
Subject: [PATCH] x86: mtrr_cleanup optimization
fix hpa's t61 with 4g ram
1. add mtrr_cleanup_debug to print out more info about layout
2. change layout from
(n - 1)*chunksize + chunk_size - NC
to
n*chunksize - NC
3. change back chunksize to 2g
otherwise will get strange layout in 2G ram system like
0 - 4g WB, 2040M - 2048M UC, 2048M - 4G NC
instead of
0 - 2g WB, 2040M - 2048M UC
Signed-off-by: Yinghai Lu <yhlu.kernel@...il.com>
---
arch/x86/kernel/cpu/mtrr/main.c | 72 +++++++++++++++++++++-------------------
1 file changed, 39 insertions(+), 33 deletions(-)
Index: linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
===================================================================
--- linux-2.6.orig/arch/x86/kernel/cpu/mtrr/main.c
+++ linux-2.6/arch/x86/kernel/cpu/mtrr/main.c
@@ -836,6 +836,13 @@ static int __init enable_mtrr_cleanup_se
}
early_param("enble_mtrr_cleanup", enable_mtrr_cleanup_setup);
+static int __init mtrr_cleanup_debug_setup(char *str)
+{
+ debug_print = 1;
+ return 0;
+}
+early_param("mtrr_cleanup_debug", mtrr_cleanup_debug_setup);
+
struct var_mtrr_state {
unsigned long range_startk;
unsigned long range_sizek;
@@ -980,13 +987,12 @@ range_to_mtrr_with_hole(struct var_mtrr_
return 0;
}
- range0_sizek -= chunk_sizek;
- if (range0_sizek && sizek) {
- while (range0_basek + range0_sizek > (basek + sizek)) {
- range0_sizek -= chunk_sizek;
- if (!range0_sizek)
- break;
- }
+ if (sizek) {
+ while (range0_basek + range0_sizek > (basek + sizek)) {
+ range0_sizek -= chunk_sizek;
+ if (!range0_sizek)
+ break;
+ }
}
if (range0_sizek) {
@@ -1000,39 +1006,38 @@ range_to_mtrr_with_hole(struct var_mtrr_
}
range_basek = range0_basek + range0_sizek;
- range_sizek = chunk_sizek;
+ range_sizek = 0;
- if (range_basek + range_sizek > basek &&
- range_basek + range_sizek <= (basek + sizek)) {
+ if (range_basek > basek &&
+ range_basek <= (basek + sizek)) {
/* one hole */
second_basek = basek;
- second_sizek = range_basek + range_sizek - basek;
+ second_sizek = range_basek - basek;
}
/* if last piece, only could one hole near end */
- if ((second_basek || !basek) &&
- range_sizek - (state->range_sizek - range0_sizek) - second_sizek <
- (chunk_sizek >> 1)) {
+ if (range0_sizek > state->range_sizek) {
/*
* one hole in middle (second_sizek is 0) or at end
* (second_sizek is 0 )
*/
- hole_sizek = range_sizek - (state->range_sizek - range0_sizek)
- - second_sizek;
- hole_basek = range_basek + range_sizek - hole_sizek
+ hole_sizek = range0_sizek - state->range_sizek - second_sizek;
+ hole_basek = range_basek - hole_sizek
- second_sizek;
- } else {
- /* fallback for big hole, or several holes */
+ } else {
+ /* need to handle left over */
range_sizek = state->range_sizek - range0_sizek;
- second_basek = 0;
- second_sizek = 0;
}
- if (debug_print)
- printk(KERN_DEBUG "range: %016lx - %016lx\n", range_basek<<10,
- (range_basek + range_sizek)<<10);
- state->reg = range_to_mtrr(state->reg, range_basek, range_sizek,
- MTRR_TYPE_WRBACK);
+ if (range_sizek) {
+ if (debug_print)
+ printk(KERN_DEBUG "range: %016lx - %016lx\n",
+ range_basek<<10,
+ (range_basek + range_sizek)<<10);
+ state->reg = range_to_mtrr(state->reg, range_basek, range_sizek,
+ MTRR_TYPE_WRBACK);
+ }
+
if (hole_sizek) {
if (debug_print)
printk(KERN_DEBUG "hole: %016lx - %016lx\n",
@@ -1155,10 +1160,10 @@ struct mtrr_cleanup_result {
/*
* gran_size: 1M, 2M, ..., 2G
- * chunk size: gran_size, ..., 4G
- * so we need (2+13)*6
+ * chunk size: gran_size, ..., 2G
+ * so we need (1+12)*6
*/
-#define NUM_RESULT 90
+#define NUM_RESULT 78
#define PSHIFT (PAGE_SHIFT - 10)
static struct mtrr_cleanup_result __initdata result[NUM_RESULT];
@@ -1231,7 +1236,7 @@ static int __init mtrr_cleanup(unsigned
if (mtrr_chunk_size && mtrr_gran_size) {
int num_reg;
- debug_print = 1;
+ debug_print++;
/* convert ranges to var ranges state */
num_reg = x86_setup_var_mtrrs(range, nr_range, mtrr_chunk_size,
mtrr_gran_size);
@@ -1267,7 +1272,7 @@ static int __init mtrr_cleanup(unsigned
}
printk(KERN_INFO "invalid mtrr_gran_size or mtrr_chunk_size, "
"will find optimal one\n");
- debug_print = 0;
+ debug_print--;
memset(result, 0, sizeof(result[0]));
}
@@ -1275,7 +1280,7 @@ static int __init mtrr_cleanup(unsigned
memset(min_loss_pfn, 0xff, sizeof(min_loss_pfn));
memset(result, 0, sizeof(result));
for (gran_size = (1ULL<<20); gran_size < (1ULL<<32); gran_size <<= 1) {
- for (chunk_size = gran_size; chunk_size < (1ULL<<33);
+ for (chunk_size = gran_size; chunk_size < (1ULL<<32);
chunk_size <<= 1) {
int num_reg;
@@ -1370,8 +1375,9 @@ static int __init mtrr_cleanup(unsigned
chunk_size <<= 10;
gran_size = result[i].gran_sizek;
gran_size <<= 10;
- debug_print = 1;
+ debug_print++;
x86_setup_var_mtrrs(range, nr_range, chunk_size, gran_size);
+ debug_print--;
set_var_mtrr_all(address_bits);
return 1;
}
--
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