Hi,
> Let us know once you reveal it. Using that info, we can reveal how much
> RAM is left...
In "include/asm-arm/page.h"
/* PAGE_SHIFT determines the page size */
#define PAGE_SHIFT 12
#define PAGE_SIZE (1UL << PAGE_SHIFT)
#define PAGE_MASK (~(PAGE_SIZE-1))
The page size appaers to be 4 K.
> I don't fully understand your reason, however, closer look into your
> code reveal this:
> #define PAGES 900
> #define SIGPAGE 4096
> ......
> for (i=0;i<PAGES;i++)
> {
> poarray=(char*)malloc(SIGPAGE);
> memset(poarray, '\0', SIGPAGE);
> if(poarray==NULL)
> {
> printf("\nError in allocating\n");
> exit(1);
> }
> }
>
> That means, you allocate --> 900 *4096 = 900 * 4kilobyte= 3600 kilobyte.
> "poarray" itself is assigned new memory block on each iteration (user
> space sees it at virtual continous memory block, while physically it
> could be non contigous).
My purpose of doing this is that I want to reserve this much memory, so that
they are not taken into consideration when I am allocating memory in another
loop.
> So far I try to conclude:
> 1. You're experiencing memory fragmentation. This makes memory allocator
> works harder to satisfy memory allocation.
Why so, as there is a request of just one page?
> 2. You're really lack of free memory. Especially, since looking that
> you're allocating 3600 kilobyte shortly after main() is executed.
Yes. But again there is much space left, (Kernel + drivers(Is driver memory
is separate from Kernel memory?) + poarray) < 16 MB
> 3. As side effect, you're experiencing memory leak.
>
Regards,
Abu.
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