linux-kernel - [RFC PATCH 1/3] zram: introduce ZRAM_PP

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Message-ID: <20240904132508.2000743-2-senozhatsky@chromium.org>
Date: Wed,  4 Sep 2024 22:24:53 +0900
From: Sergey Senozhatsky <senozhatsky@...omium.org>
To: Minchan Kim <minchan@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Richard Chang <richardycc@...gle.com>,
	linux-kernel@...r.kernel.org,
	Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [RFC PATCH 1/3] zram: introduce ZRAM_PP_SLOT flag

This flag will indicate that the slot was selected as
a candidate slot for post-processing (pp) and was assigned
to a pp group.

Signed-off-by: Sergey Senozhatsky <senozhatsky@...omium.org>
---
 drivers/block/zram/zram_drv.c | 3 +++
 drivers/block/zram/zram_drv.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/block/zram/zram_drv.c b/drivers/block/zram/zram_drv.c
index 1f1bf175a6c3..c91fdf399d1b 100644
--- a/drivers/block/zram/zram_drv.c
+++ b/drivers/block/zram/zram_drv.c
@@ -1368,6 +1368,9 @@ static void zram_free_page(struct zram *zram, size_t index)
 		goto out;
 	}
 
+	if (zram_test_flag(zram, index, ZRAM_PP_SLOT))
+		zram_clear_flag(zram, index, ZRAM_PP_SLOT);
+
 	handle = zram_get_handle(zram, index);
 	if (!handle)
 		return;
diff --git a/drivers/block/zram/zram_drv.h b/drivers/block/zram/zram_drv.h
index b976824ead67..e0578b3542ce 100644
--- a/drivers/block/zram/zram_drv.h
+++ b/drivers/block/zram/zram_drv.h
@@ -50,6 +50,7 @@ enum zram_pageflags {
 	ZRAM_SAME,	/* Page consists the same element */
 	ZRAM_WB,	/* page is stored on backing_device */
 	ZRAM_UNDER_WB,	/* page is under writeback */
+	ZRAM_PP_SLOT,	/* Selected for post-processing */
 	ZRAM_HUGE,	/* Incompressible page */
 	ZRAM_IDLE,	/* not accessed page since last idle marking */
 	ZRAM_INCOMPRESSIBLE, /* none of the algorithms could compress it */
-- 
2.46.0.469.g59c65b2a67-goog