• Sergey Senozhatsky's avatar
    zsmalloc/zram: introduce zs_pool_stats api · 7d3f3938
    Sergey Senozhatsky authored
    `zs_compact_control' accounts the number of migrated objects but it has
    a limited lifespan -- we lose it as soon as zs_compaction() returns back
    to zram.  It worked fine, because (a) zram had it's own counter of
    migrated objects and (b) only zram could trigger compaction.  However,
    this does not work for automatic pool compaction (not issued by zram).
    To account objects migrated during auto-compaction (issued by the
    shrinker) we need to store this number in zs_pool.
    
    Define a new `struct zs_pool_stats' structure to keep zs_pool's stats
    there.  It provides only `num_migrated', as of this writing, but it
    surely can be extended.
    
    A new zsmalloc zs_pool_stats() symbol exports zs_pool's stats back to
    caller.
    
    Use zs_pool_stats() in zram and remove `num_migrated' from zram_stats.
    Signed-off-by: default avatarSergey Senozhatsky <sergey.senozhatsky@gmail.com>
    Suggested-by: default avatarMinchan Kim <minchan@kernel.org>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
    7d3f3938
zram_drv.c 33.9 KB