From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-oi1-f170.google.com (mail-oi1-f170.google.com [209.85.167.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 595EB48AE1F for ; Tue, 5 May 2026 15:39:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.167.170 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777995549; cv=none; b=clryvNyzLkG4gE18DEsLDO2IKcwXM4q3gvC7BjyNZN+ddiLaEIqi0eeArcMH6KpqSbwSaRf6ZRffczQzKI/xwwbjxMYha858OUwRLURCX+f41kM0voBEBDukBxBm4EgaRSGFcty1bJ9JrgR4on0vAlimOgvWm05FJE7p1CVVJeo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1777995549; c=relaxed/simple; bh=mkcvMuU5djSo9+vIBFEeZQbilCGEOXeQmpYMwgCper0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QUCmVwtnTdnOhUs7MzzK0GSVRutEQIxVcD/BVRzeZQlsnOq+MTRTH/GZoYQISH0dV4fKNgAX4uaFaQAHFhPK+bG7T8ltN+7XImT/cbfF6PjaP+0nMfphyA4PWXlKxHrQbBrNPW4w34v439sPZcrvaj6OgcgxgTU5dZiKGFJF+bE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=ErHjXckL; arc=none smtp.client-ip=209.85.167.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ErHjXckL" Received: by mail-oi1-f170.google.com with SMTP id 5614622812f47-479dd56d016so3874056b6e.3 for ; Tue, 05 May 2026 08:39:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20251104; t=1777995546; x=1778600346; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=KREMUBUXFd40dOrxzMFx0/PDjOEkv9ZqqqX11trPF+8=; b=ErHjXckLChm6Ah2bOqUohKMeDi12+YrLEtDX64k3tFBY/1+h+xSFO3G4mF5bynHQlf Wcg4SGuiTxPvDthDv9J4SFnaRB6HneaeNxBJTMs8kb7r7Xeo4VhvsOTcT6soLMtHqLjD QUv/STKlOxDyZ1fwLitPlz6Xdr1cNOYF/QJVKM7lEiEPEK5tz+M3vKgrEBeGUuv6nTtm DYf7qnlQBBZ9KkAHCXwNw+m4bJ2/g8DLxnHw5JUVJ0inhcnh8l+HKG1vGvQiqhNp2+SK hi1VHzRRrmfNzGfCblcAJ145BOLlBRoZPSsKtnPJik9e3vs7KstoCiNAUJnQX0MUr/0c 9uAw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20251104; t=1777995546; x=1778600346; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-gg:x-gm-message-state:from :to:cc:subject:date:message-id:reply-to; bh=KREMUBUXFd40dOrxzMFx0/PDjOEkv9ZqqqX11trPF+8=; b=Bbo4bo/RDzf+5eHqmcUdedeLeNpLVP/wePHclV9MLg1WfmFiKCv2eRHMlebX8F6nDR L09wMf0sF/BIa6d8DRPKlhljwy7i8+7i59M+/MbNEgFP1WwMUfTkG0aP1nE1HQt7+aJV 7czO9269igVaOV5q4TAk/vJQDWVUe/j0RNKrDYWG/1eYO6Yg95bUuHAGF6LtwI0Q+ren wxnha2vLjBtXF2G1qq3yZvGyJ+VIxxosdMtYQdOftOkajAmoxAsjAPB+Mdx8wtINQxWW Whv7mfZBwdU8BCiNl3v8TLi2fat+La4qJz9w6uNE1HXBhqlsS+Rt85JtCEZvEdQzpx/8 sWgg== X-Forwarded-Encrypted: i=1; AFNElJ/DXizf/HqS96gKDvm+QJZ3hxzn0M568SYC5wqTcfrNwHlcHPdk/eR0lLM50j1zoaxbSTiBLf/7LYE=@vger.kernel.org X-Gm-Message-State: AOJu0Yz2XLci6ak1NvYnMcT6wi1jyLkpd0su71Abxgn0kPinLPh0lfGe IWBVk+SKB7SCSYqFokoVlBJ3S+85mtwRn0pFKPo5qXSGktNEpere/3/f X-Gm-Gg: AeBDieuYIvOYS1/fPtgLUp4RE4K2PR3xmyi7nkxaj5ncCdlqCNtuIL0fccyBzXpwuVd oH73Fj/B2wTuMKPRtti8hYANFVTSqclOuru9uPtToaQfmNxBf2cQC4ikUCNqC/PKXe62IMrTm0Z nJKFYeae65MMefIBkxxymLIeeR2gevceK7Lyn18+ygbWAhr2m40c+kmp5Pp12avCxTPTO6YTjuZ I/KcFSwiqgelMk35k+KDllI1BASUtOhiJ652brf8FeSIX26AkkZhuqLCWYX8anMTpm9RTfvBbWN 9yqN799W4pxMAhgHubS9kqPIah+oWWwzjnz7QzcOAHoqJ2SzZI9YRMTBHI0Buv9Zj18/n2Ya7zV wClSb5yh95AMh8oxDOIHXyYs+ndGCfoIq6A0yyKTyiqHQjFupsyyP+HXFkycoZHpxfSSjPnxpav rURXOUiY/kH2UEq6ojf0Fr/0zchAA5FTHWANBXWL3vf8zpAvKogUIXhYiEacvKztZnNgQ= X-Received: by 2002:a05:6808:1787:b0:467:2a6e:adb3 with SMTP id 5614622812f47-47c892314ddmr6943387b6e.23.1777995546294; Tue, 05 May 2026 08:39:06 -0700 (PDT) Received: from localhost ([2a03:2880:10ff:71::]) by smtp.gmail.com with ESMTPSA id 5614622812f47-47c7640069csm8753456b6e.8.2026.05.05.08.39.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 05 May 2026 08:39:05 -0700 (PDT) From: Nhat Pham To: kasong@tencent.com Cc: Liam.Howlett@oracle.com, akpm@linux-foundation.org, apopple@nvidia.com, axelrasmussen@google.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, bhe@redhat.com, byungchul@sk.com, cgroups@vger.kernel.org, chengming.zhou@linux.dev, chrisl@kernel.org, corbet@lwn.net, david@kernel.org, dev.jain@arm.com, gourry@gourry.net, hannes@cmpxchg.org, hughd@google.com, jannh@google.com, joshua.hahnjy@gmail.com, lance.yang@linux.dev, lenb@kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, lorenzo.stoakes@oracle.com, matthew.brost@intel.com, mhocko@suse.com, muchun.song@linux.dev, npache@redhat.com, nphamcs@gmail.com, pavel@kernel.org, peterx@redhat.com, peterz@infradead.org, pfalcato@suse.de, rafael@kernel.org, rakie.kim@sk.com, roman.gushchin@linux.dev, rppt@kernel.org, ryan.roberts@arm.com, shakeel.butt@linux.dev, shikemeng@huaweicloud.com, surenb@google.com, tglx@kernel.org, vbabka@suse.cz, weixugc@google.com, ying.huang@linux.alibaba.com, yosry.ahmed@linux.dev, yuanchu@google.com, zhengqi.arch@bytedance.com, ziy@nvidia.com, kernel-team@meta.com, riel@surriel.com, haowenchao22@gmail.com Subject: [PATCH v6 04/22] zswap: add new helpers for zswap entry operations Date: Tue, 5 May 2026 08:38:33 -0700 Message-ID: <20260505153854.1612033-5-nphamcs@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260505153854.1612033-1-nphamcs@gmail.com> References: <20260505153854.1612033-1-nphamcs@gmail.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Add new helper functions to abstract away zswap entry operations, in order to facilitate re-implementing these functions when swap is virtualized. Signed-off-by: Nhat Pham --- mm/zswap.c | 59 ++++++++++++++++++++++++++++++++++++------------------ 1 file changed, 40 insertions(+), 19 deletions(-) diff --git a/mm/zswap.c b/mm/zswap.c index 315e4d0d0831..a5a3f068bd1a 100644 --- a/mm/zswap.c +++ b/mm/zswap.c @@ -234,6 +234,38 @@ static inline struct xarray *swap_zswap_tree(swp_entry_t swp) >> ZSWAP_ADDRESS_SPACE_SHIFT]; } +static inline void *zswap_entry_store(swp_entry_t swpentry, + struct zswap_entry *entry) +{ + struct xarray *tree = swap_zswap_tree(swpentry); + pgoff_t offset = swp_offset(swpentry); + + return xa_store(tree, offset, entry, GFP_KERNEL); +} + +static inline void *zswap_entry_load(swp_entry_t swpentry) +{ + struct xarray *tree = swap_zswap_tree(swpentry); + pgoff_t offset = swp_offset(swpentry); + + return xa_load(tree, offset); +} + +static inline void *zswap_entry_erase(swp_entry_t swpentry) +{ + struct xarray *tree = swap_zswap_tree(swpentry); + pgoff_t offset = swp_offset(swpentry); + + return xa_erase(tree, offset); +} + +static inline bool zswap_empty(swp_entry_t swpentry) +{ + struct xarray *tree = swap_zswap_tree(swpentry); + + return xa_empty(tree); +} + #define zswap_pool_debug(msg, p) \ pr_debug("%s pool %s\n", msg, (p)->tfm_name) @@ -1000,8 +1032,6 @@ static bool zswap_decompress(struct zswap_entry *entry, struct folio *folio) static int zswap_writeback_entry(struct zswap_entry *entry, swp_entry_t swpentry) { - struct xarray *tree; - pgoff_t offset = swp_offset(swpentry); struct folio *folio; struct mempolicy *mpol; bool folio_was_allocated; @@ -1040,8 +1070,7 @@ static int zswap_writeback_entry(struct zswap_entry *entry, * old compressed data. Only when this is successful can the entry * be dereferenced. */ - tree = swap_zswap_tree(swpentry); - if (entry != xa_load(tree, offset)) { + if (entry != zswap_entry_load(swpentry)) { ret = -ENOMEM; goto out; } @@ -1051,7 +1080,7 @@ static int zswap_writeback_entry(struct zswap_entry *entry, goto out; } - xa_erase(tree, offset); + zswap_entry_erase(swpentry); count_vm_event(ZSWPWB); if (entry->objcg) @@ -1427,9 +1456,7 @@ static bool zswap_store_page(struct page *page, if (!zswap_compress(page, entry, pool)) goto compress_failed; - old = xa_store(swap_zswap_tree(page_swpentry), - swp_offset(page_swpentry), - entry, GFP_KERNEL); + old = zswap_entry_store(page_swpentry, entry); if (xa_is_err(old)) { int err = xa_err(old); @@ -1563,11 +1590,9 @@ bool zswap_store(struct folio *folio) unsigned type = swp_type(swp); pgoff_t offset = swp_offset(swp); struct zswap_entry *entry; - struct xarray *tree; for (index = 0; index < nr_pages; ++index) { - tree = swap_zswap_tree(swp_entry(type, offset + index)); - entry = xa_erase(tree, offset + index); + entry = zswap_entry_erase(swp_entry(type, offset + index)); if (entry) zswap_entry_free(entry); } @@ -1599,9 +1624,7 @@ bool zswap_store(struct folio *folio) int zswap_load(struct folio *folio) { swp_entry_t swp = folio->swap; - pgoff_t offset = swp_offset(swp); bool swapcache = folio_test_swapcache(folio); - struct xarray *tree = swap_zswap_tree(swp); struct zswap_entry *entry; VM_WARN_ON_ONCE(!folio_test_locked(folio)); @@ -1619,7 +1642,7 @@ int zswap_load(struct folio *folio) return -EINVAL; } - entry = xa_load(tree, offset); + entry = zswap_entry_load(swp); if (!entry) return -ENOENT; @@ -1648,7 +1671,7 @@ int zswap_load(struct folio *folio) */ if (swapcache) { folio_mark_dirty(folio); - xa_erase(tree, offset); + zswap_entry_erase(swp); zswap_entry_free(entry); } @@ -1658,14 +1681,12 @@ int zswap_load(struct folio *folio) void zswap_invalidate(swp_entry_t swp) { - pgoff_t offset = swp_offset(swp); - struct xarray *tree = swap_zswap_tree(swp); struct zswap_entry *entry; - if (xa_empty(tree)) + if (zswap_empty(swp)) return; - entry = xa_erase(tree, offset); + entry = zswap_entry_erase(swp); if (entry) zswap_entry_free(entry); } -- 2.52.0