Hi Rajat... > Do linux systems have swap files?? Isn't swap space provided (only) by > the swap partition? Yes, you can format a blank file and format it as swap. Later, you mount it (mkswap). In the end, you get another swap area, only this time it is not a partition. >Ummm ... not sure ... but just a direction to think upon. There memory >occupied by VFS / filesystems may be holding some buffers (of certain >files). So a file system request may be used to flush these buffers to >the disk, and thus free memory to be returned. Hm, I agree with the idea above. Page cache can be simply dropped to provide more space, but first it needs to be sync'ed. That's where filesystem operation comes from.. regards, Mulyadi -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/