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Subjectpage cache size
i would like to change the page cache size for some
fs/performance tests under 2.4.0-test3/i386.

does anyone know how the right way to do that??

PAGE_SIZE is defined in asm/page.h as (1UL << PAGE_SHIFT)
PAGE_SHIFT for i386 is 12, so PAGE_SIZE is 4096

in linux/pagemap.h PAGE_CACHE_SIZE is defined as PAGE_SHIFT.

there is a (unclear) comment that indicates (in my opinion :)
that page size _will_ probaly increase in future.

so that is what i've tried in order to get a page cache size of
- let's say 8192 in linux/pagemap.h:

original version:
#define PAGE_CACHE_SHIFT PAGE_SHIFT
#define PAGE_CACHE_SIZE PAGE_SIZE
#define PAGE_CACHE_MASK PAGE_MASK
...

my try:
#define PAGE_CACHE_SHIFT 13
#define PAGE_CACHE_SIZE (1UL << PAGE_CACHE_SHIFT)
#define PAGE_CACHE_MASK (~(PAGE_CACHE_SIZE-1))


after rebuilding the kernel and rebooting the system
hangs after mounting root (ext2). no messages.


thx,
Norbert

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