Messages in this thread Patch in this message |  | | Date | Tue, 19 Mar 2002 20:00:48 -0800 | From | Andrew Morton <> | Subject | aa-150-read_write_tweaks |
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- Don't do flush_page_to_ram() on the page fault-in path. That's handled in mm/memory.c, and filemap.c doesn't need to do it.
- In generic_file_write(), only set the page's Referenced bit once, when the write touches the start of the page. This is a microoptimisation. Seemingly a buggy one too - lseek exists...
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--- 2.4.19-pre3/mm/filemap.c~aa-150-read_write_tweaks Tue Mar 19 19:49:02 2002 +++ 2.4.19-pre3-akpm/mm/filemap.c Tue Mar 19 19:49:02 2002 @@ -1968,7 +1968,6 @@ success: * and possibly copy it over to another page.. */ mark_page_accessed(page); - flush_page_to_ram(page); return page; no_cached_page: @@ -3089,8 +3088,15 @@ generic_file_write(struct file *file,con } unlock: kunmap(page); + + /* + * Mark the page accessed if we wrote the + * beginning or we just did an lseek. + */ + if (!offset || !file->f_reada) + SetPageReferenced(page); + /* Mark it unlocked again and drop the page.. */ - SetPageReferenced(page); UnlockPage(page); page_cache_release(page);
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