[Suspend2][ 17/20] [Suspend2] Calculate the amount of free memory needed.

[Nigel Cunningham <nigel@suspend2.net>]

Calculate the minimum amount of free ram before we will consider ourselves
to have enough to cover all expected needs. We can have the VM freeing
memory for us - that would create an inconsistent image.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

 kernel/power/prepare_image.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/kernel/power/prepare_image.c b/kernel/power/prepare_image.c
index 604089f..054d0d4 100644
--- a/kernel/power/prepare_image.c
+++ b/kernel/power/prepare_image.c
@@ -520,3 +520,11 @@ long storage_needed(int use_ecr, int ign
 		       + header_storage_needed());
 }
 
+long ram_to_suspend(void)
+{
+	return (1 + 
+		max_t(long, (pagedir1.pageset_size + extra_pd1_pages_allowance - 
+			pageset2_sizelow - extra_pagedir_pages_allocated) / 2, 0) +
+		MIN_FREE_RAM + suspend_memory_for_modules());
+}
+

--
Nigel Cunningham		nigel at suspend2 dot net
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