Hi I am looking for help to reduce the number of cached pages in the system. I am using 2.6.12 linux kernel on ARM processor.for my embedded USB mass storage application. As in the system when I do read/write operatation from the USB disk attached to my development boards, I observed steep increase in the (/proc/meminfo) Buffers: 48 kB [From 0KB] Cached: 17184 kB [From 8100 KB] I have few queries : 1. MemInuse = (MemTotal - Memfree) , why it is not equal to (Active Pages + Inactive Pages+mapped pages + slab + page Tables) 2. As per my understanding slab page numbers should match exactly with the total page output of /proc/slabinfo is it correct ? 3. Is there any provision in linux kernel through which I can restrict the new page allocation for disk operation to not to be added in the page-cache ? 4. If I open the file with O_DIRECT Flag would page_cache be avoided, irrespective it is file read or File write operations? 5. Is pdflush parameters dirty_background_ratio and dirty_ratio would help be in file read operations also to reduce the page cache eneries. 6. As buffer cached enteries increases to only 48K, does it means mostly page cache are added by filesystem while actual disk operation are actual very few. with regards Ravish Tayal -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
