[EMAIL PROTECTED] wrote:
From: Andrew Morton <[EMAIL PROTECTED]>
Accounting writes is fairly simple: whenever a process flips a page from clean
to dirty, we accuse it of having caused a write to underlying storage of
PAGE_CACHE_SIZE bytes.
On architectures where dirtying a page doesn't cause a page fault (like i386), couldn't you end up billing the wrong process (in fact, I think that even on other archituctures set_page_dirty() doesn't get called immediately in the page fault handler)?
AFAICS, set_page_dirty() is mostly called when trying to unmap a page when
trying to shrink LRU lists, and there is no guarantee that this happens under
the process that dirtied it (in fact, the set_page_dirty() is often done by
kswapd).
-- Suleiman
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
