On Sat, Jun 05, 2021 at 09:24:00AM -0700, yongw.pur@xxxxxxxxx wrote: > From: wangyong <yongw.pur@xxxxxxxxx> > > When zram is used, available+Swap free memory is obviously > bigger than we actually can use, because zram can compress > memory by compression algorithm and zram compressed data > will occupy memory too. > > So, we can count the compression ratio of zram in the kernel. > The space will be saved by zram and other swap device are > calculated as follows: > zram[swapfree - swapfree * compress ratio] + swapdev[swapfree] > We can evaluate the available memory of the whole system as: > MemAvailable+zram[swapfree - swapfree * compress ratio]+swapdev[swapfree] > > Add an entry to the /proc/meminfo file, returns swap will save space. > Which name is more appropriate is still under consideration. > There are several alternative names: SwapAvailable, SwapSaved, > SwapCompressible > > Signed-off-by: wangyong <yongw.pur@xxxxxxxxx> > --- > drivers/block/zram/zcomp.h | 1 + > drivers/block/zram/zram_drv.c | 19 +++++++++ > drivers/block/zram/zram_drv.h | 1 + > fs/proc/meminfo.c | 1 + > include/linux/swap.h | 10 +++++ > mm/swapfile.c | 95 +++++++++++++++++++++++++++++++++++++++++++ > mm/vmscan.c | 1 + > 7 files changed, 128 insertions(+) You are adding a new sysfs file with no new Documentation/ABI entry. Also are you sure you are allowed to add a new proc file entry without breaking existing tools? thanks, greg k-h
