Increment/decrement zcache_[eph|pers]_zpages for zero-filled pages, the main point of the counters for zpages and pageframes is to be able to calculate density == zpages/pageframes. A zero-filled page becomes a zpage that "compresses" to zero bytes and, as a result, requires zero pageframes for storage. So the zpages counter should be increased but the pageframes counter should not.
[Dan Magenheimer <dan.magenhei...@oracle.com>: patch description] Acked-by: Dan Magenheimer <dan.magenhei...@oracle.com> Reviewed-by: Konrad Rzeszutek Wilk <konrad.w...@oracle.com> Signed-off-by: Wanpeng Li <liw...@linux.vnet.ibm.com> --- drivers/staging/zcache/zcache-main.c | 7 ++++++- 1 files changed, 6 insertions(+), 1 deletions(-) diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 961fbf1..14dcf8a 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -648,6 +648,8 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *sizep, bool raw, if (pampd == (void *)ZERO_FILLED) { handle_zero_filled_page(data); zero_filled = true; + zsize = 0; + zpages = 1; if (!raw) *sizep = PAGE_SIZE; goto zero_fill; @@ -696,8 +698,11 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool, BUG_ON(preemptible()); - if (pampd == (void *)ZERO_FILLED) + if (pampd == (void *)ZERO_FILLED) { zero_filled = true; + zsize = 0; + zpages = 1; + } if (pampd_is_remote(pampd) && !zero_filled) { BUG_ON(!ramster_enabled); -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/