From 445d7b856d748b50412fb2b940cbd99e62ac972b Mon Sep 17 00:00:00 2001
From: Colin Cross <ccross@android.com>
Date: Thu, 18 Jul 2013 16:52:55 -0700
Subject: [PATCH] ARM: msm: flo: add limit_mem= kernel command line parameter
Add a command line parameter to limit available memory (after
all carveouts are reserved) to the specified size. This can
be used to help test low memory situations.
Change-Id: Ia25e028315260b706365afe820e6e9986e8e7e2d
Signed-off-by: Colin Cross <ccross@android.com>
Signed-off-by: Iliyan Malchev <malchev@google.com>
---
arch/arm/mach-msm/asustek/flo/board-flo.c | 49 +++++++++++++++++++++++
1 file changed, 49 insertions(+)
diff --git a/arch/arm/mach-msm/asustek/flo/board-flo.c b/arch/arm/mach-msm/asustek/flo/board-flo.c
index 57f65c932773..6e1271a22bfe 100644
--- a/arch/arm/mach-msm/asustek/flo/board-flo.c
+++ b/arch/arm/mach-msm/asustek/flo/board-flo.c
@@ -888,6 +888,53 @@ static int __init hdmi_resulution_setup(char *param)
}
early_param("ext_resolution", hdmi_resulution_setup);
+static unsigned long limit_mem;
+
+static int __init limit_mem_setup(char *param)
+{
+ limit_mem = memparse(param, NULL);
+ return 0;
+}
+early_param("limit_mem", limit_mem_setup);
+
+static void __init limit_mem_reserve(void)
+{
+ unsigned long to_remove;
+ unsigned long reserved_mem;
+ unsigned long i;
+ phys_addr_t base;
+
+ if (!limit_mem)
+ return;
+
+ reserved_mem = ALIGN(memblock.reserved.total_size, PAGE_SIZE);
+
+ to_remove = memblock.memory.total_size - reserved_mem - limit_mem;
+
+ pr_info("Limiting memory from %lu KB to to %lu kB by removing %lu kB\n",
+ (memblock.memory.total_size - reserved_mem) / 1024,
+ limit_mem / 1024,
+ to_remove / 1024);
+
+ /* First find as many highmem pages as possible */
+ for (i = 0; i < to_remove; i += PAGE_SIZE) {
+ base = memblock_find_in_range(memblock.current_limit,
+ MEMBLOCK_ALLOC_ANYWHERE, PAGE_SIZE, PAGE_SIZE);
+ if (!base)
+ break;
+ memblock_remove(base, PAGE_SIZE);
+ }
+ /* Then find as many lowmem 1M sections as possible */
+ for (; i < to_remove; i += SECTION_SIZE) {
+ base = memblock_find_in_range(0, MEMBLOCK_ALLOC_ACCESSIBLE,
+ SECTION_SIZE, SECTION_SIZE);
+ if (!base)
+ break;
+ memblock_remove(base, SECTION_SIZE);
+ }
+}
+
+
static void __init apq8064_reserve(void)
{
apq8064_set_display_params(prim_panel_name, ext_panel_name,
@@ -897,6 +944,8 @@ static void __init apq8064_reserve(void)
#ifdef CONFIG_MACH_ASUSTEK
asustek_reserve();
#endif
+
+ limit_mem_reserve();
}
static void __init place_movable_zone(void)
--
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