Thanks for the great help.
Just asking, If I have to include this function [ drop_caches_sysctl_handler ] , then what should I do ? Shall I export it and compile the kernel or is there any other means to do it.
Second, I just want to know that there will be lots of hurdels to set the arguments of above handler, So, if I only export
static void drop_pagecache(void) function in kernel & include this in my driver, would it work as per the expectation ?
May be I am wrong, but please correct if the above method need any modification?
Thanks & Best regards,
Krishna
On Fri, Jul 17, 2009 at 8:11 PM, Peter Teoh <htmldeveloper@xxxxxxxxx> wrote:
sorry....my previous was accidentally sent out halfway...specifically
detailing on the implementation of drop_caches_sysctl_handler():
drop_caches_sysctl_handler()--->
> and reading into the implementation, it just wipe away all the dirty
> buffer cache (as the name implies). Not really the type of flushing
> I originally meant - which is to write back the dirty buffer cache to
> the backing store.
>
drop_pagecache()--->drop_pagecache_sb()--->invalidate_mapping_pages().
where invalidate_mappping_pages() is in mm/truncate.c.....and so on.
and as drop_pagecache_sb() is done for each filesystem's superblock,
which is why my initial statement is that it is performance-heavy.
if u know what to flush out, doing it directly will be much better.
