From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-175.mta1.migadu.com (out-175.mta1.migadu.com [95.215.58.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0CA753C07 for ; Fri, 26 Jan 2024 08:31:58 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.175 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706257922; cv=none; b=C+olsVUaX+gLXEQtmVnz0iIUZ4HABfW5JvYsHn1NjyQd1kjQA+X4eFW0T6hEkBC3ECxWOsRLlxdk15+OSLgb2DNgiQ6Ai3QU47++UdMcC8iTrYf1kLuNv4FETKNFzJnzG51zvSpstVtFArqkExVIeC46r7S2TIDUFj2X1XwAou8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1706257922; c=relaxed/simple; bh=beAV2xZzm1pfX7BpJJ4sLYGMc2yhgnU5EF3GNuNtmDc=; h=From:To:Cc:Subject:Date:Message-Id:MIME-Version; b=QD+HgMw6t5/umHpmdEUKq/g4KZSfX/SCqF6J3Dv8AbCXsV7/++PUiJLgN57pc+T7i7K03Jz8gDVtgNW1fwSHUJXoUEP758Yatwm2mR8APpjHyu39Fxhm0xyHJoFmCyzM4JfLSZC1c/l4H/n4DXLV3IHaPMBOx+eykg3hp9wXNrU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=t38FsnZ1; arc=none smtp.client-ip=95.215.58.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="t38FsnZ1" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1706257917; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=ul4Yj318/IPfN1mLm2oHYHwsIT4SRkZ2huqI5cSMQ1M=; b=t38FsnZ1Muc6VXvBr4BPW2hj/FxunpwClITeZKYaX+yMeSCpB5klMmu1qlnZQ4WYYk6bbD 1GiLoLKVo/wWom1Stp4eARMN/cROOzoWLXX5GTzdXy3ExsHOa9BKTaRBTPCWWV6Uvk/adX uepBwPm12pYL45eeBg0ZxwSF2w5x0dg= From: chengming.zhou@linux.dev To: hannes@cmpxchg.org, yosryahmed@google.com, nphamcs@gmail.com, akpm@linux-foundation.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, chengming.zhou@linux.dev, Chengming Zhou Subject: [PATCH 1/2] mm/zswap: don't return LRU_SKIP if we have dropped lru lock Date: Fri, 26 Jan 2024 08:30:14 +0000 Message-Id: <20240126083015.3557006-1-chengming.zhou@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT From: Chengming Zhou LRU_SKIP can only be returned if we don't ever dropped lru lock, or we need to return LRU_RETRY to restart from the head of lru list. Actually we may need to introduce another LRU_STOP to really terminate the ongoing shrinking scan process, when we encounter a warm page already in the swap cache. The current list_lru implementation doesn't have this function to early break from __list_lru_walk_one. Fixes: b5ba474f3f51 ("zswap: shrink zswap pool based on memory pressure") Signed-off-by: Chengming Zhou --- mm/zswap.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index 00e90b9b5417..81cb3790e0dd 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -901,10 +901,8 @@ static enum lru_status shrink_memcg_cb(struct list_head *item, struct list_lru_o * into the warmer region. We should terminate shrinking (if we're in the dynamic * shrinker context). */ - if (writeback_result == -EEXIST && encountered_page_in_swapcache) { - ret = LRU_SKIP; + if (writeback_result == -EEXIST && encountered_page_in_swapcache) *encountered_page_in_swapcache = true; - } goto put_unlock; } -- 2.40.1