On 2012-09-27 19:35, Paul Bolle wrote:
On Fri, 2012-09-21 at 16:40 +0800, Zhenzhong Duan wrote:
@@ -275,7 +280,7 @@ static int __frontswap_shrink(unsigned long target_pages,
if (total_pages<= target_pages) {
/* Nothing to do */
*pages_to_unuse = 0;
I think setting pages_to_unuse to zero here is not needed. It is
initiated to zero in frontswap_shrink() and hasn't been touched since.
See my patch at https://lkml.org/lkml/2012/9/27/250.
Yes, it's unneeded. But I didn't see warning as you said in above link
when run 'make V=1 mm/frontswap.o'.
- return 0;
+ return 1;
}
total_pages_to_unuse = total_pages - target_pages;
return __frontswap_unuse_pages(total_pages_to_unuse, pages_to_unuse,
type);
@@ -302,7 +307,7 @@ void frontswap_shrink(unsigned long target_pages)
spin_lock(&swap_lock);
ret = __frontswap_shrink(target_pages,&pages_to_unuse,&type);
spin_unlock(&swap_lock);
- if (ret == 0&& pages_to_unuse)
+ if (ret == 0)
try_to_unuse(type, true, pages_to_unuse);
return;
}
Are you sure pages_to_unuse won't be zero here? I've stared quite a bit
at __frontswap_unuse_pages() and it's not obvious pages_to_unuse (there
also called unused) will never be zero when that function returns zero.
pages_to_unuse==0 means all pages need to be unused.
zduan
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