Hi Johannes, On Wed, Apr 27, 2022 at 12:00:15PM -0400, Johannes Weiner wrote: > Currently it requires poking at debugfs to figure out the size and > population of the zswap cache on a host. There are no counters for > reads and writes against the cache. As a result, it's difficult to > understand zswap behavior on production systems. > > Print zswap memory consumption and how many pages are zswapped out in > /proc/meminfo. Count zswapouts and zswapins in /proc/vmstat. > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> > --- > fs/proc/meminfo.c | 7 +++++++ > include/linux/swap.h | 5 +++++ > include/linux/vm_event_item.h | 4 ++++ > mm/vmstat.c | 4 ++++ > mm/zswap.c | 13 ++++++------- > 5 files changed, 26 insertions(+), 7 deletions(-) > > diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c > index 6fa761c9cc78..6e89f0e2fd20 100644 > --- a/fs/proc/meminfo.c > +++ b/fs/proc/meminfo.c > @@ -86,6 +86,13 @@ static int meminfo_proc_show(struct seq_file *m, void *v) > > show_val_kb(m, "SwapTotal: ", i.totalswap); > show_val_kb(m, "SwapFree: ", i.freeswap); > +#ifdef CONFIG_ZSWAP > + seq_printf(m, "Zswap: %8lu kB\n", > + (unsigned long)(zswap_pool_total_size >> 10)); > + seq_printf(m, "Zswapped: %8lu kB\n", > + (unsigned long)atomic_read(&zswap_stored_pages) << > + (PAGE_SHIFT - 10)); > +#endif I agree it would be very handy to have the memory consumption in meminfo https://lore.kernel.org/all/YYwZXrL3Fu8%2FvLZw@xxxxxxxxxx/ If we really go this Zswap only metric instead of general term "Compressed", I'd like to post maybe "Zram:" with same reason in this patchset. Do you think that's better idea instead of introducing general term like "Compressed:" or something else?
