From nobody Mon Feb 9 19:53:15 2026 Received: from mgamail.intel.com (mgamail.intel.com [198.175.65.11]) (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 18A4881ACB for ; Fri, 16 Aug 2024 05:48:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.175.65.11 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723787293; cv=none; b=cqI94NIhdLTFkkCilya7Qww0L9EUYkMt4Nhlpj+o+qUS3YIp+Wu3g0W8zQM53KILgWgdIE2tJsmRNtJZGU9EpYd71tv7gbe0bRlzl08SuHZzJ6p3SlIMzy1Gn8iOkIrOivpCIDA5mS1DjdZIBrxEv+K3OgyBtzo3kxiEr0Rot6o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723787293; c=relaxed/simple; bh=pIv8/Aymq35M3mk+Ip2dqi+IlPE8wYobMr4oum9ku1Y=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=c3geManx+iWEcZMuLTf8/MXpm1KuugTvcsRIHXF1uFoX2m4tagwvdaDdERjDUo483nql/9BI2ROMkU8nQULj92pzE96nBzWbbSTee+6ZlSsUFFB9k1y/8fFIYcZj0pU2wrLHo/cNbOOL1jjSAOumbakcyJpH2dzQIeymetj7YyE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com; spf=pass smtp.mailfrom=intel.com; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b=P+wJxvBY; arc=none smtp.client-ip=198.175.65.11 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=intel.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=intel.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=intel.com header.i=@intel.com header.b="P+wJxvBY" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1723787292; x=1755323292; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=pIv8/Aymq35M3mk+Ip2dqi+IlPE8wYobMr4oum9ku1Y=; b=P+wJxvBYskjtF7kfXxg/oeJEI0FT1sEaAGWwJpTszRVu1Z9RVwLuVooW GRuxJDnsm7s9Y2QdrzhKurJFHYnCAeMNmKXls2ZNUWfW0ngocGI9J7xlr B3E2f+zi1TUzOcwezZCO7nHQvNkm5v7K39iPWacc7OlqNwSKWe19xUNXE IdVKBZLGZgEd6am1jJgoaC/XJC0iJEF7JgNL2kqVm6TCZET/0MQ+bjEUv 9VYlukZB00rMyES+L3VRZGlJi6caV5YCHTOvKup+8/24G0vqbkVdd1Jm1 kNTcdCzABbjAjRv+C3pOn90s5/PmG59S2fui2AOqNQCo8FSBvFeQmzLSK g==; X-CSE-ConnectionGUID: z6NMVYS+S9iy/SHjW4l3uA== X-CSE-MsgGUID: sRPe6J+7SE6xFAcjt2y2jQ== X-IronPort-AV: E=McAfee;i="6700,10204,11165"; a="32648136" X-IronPort-AV: E=Sophos;i="6.10,150,1719903600"; d="scan'208";a="32648136" Received: from orviesa010.jf.intel.com ([10.64.159.150]) by orvoesa103.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 15 Aug 2024 22:48:07 -0700 X-CSE-ConnectionGUID: Lw57TrXiShu8ilNs3A/XgQ== X-CSE-MsgGUID: YVfs9eGNSDGbKoVTja+gQw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.10,150,1719903600"; d="scan'208";a="59415342" Received: from jf5300-b11a338t.jf.intel.com ([10.242.51.6]) by orviesa010.jf.intel.com with ESMTP; 15 Aug 2024 22:48:06 -0700 From: Kanchana P Sridhar To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, hannes@cmpxchg.org, yosryahmed@google.com, nphamcs@gmail.com, ryan.roberts@arm.com, ying.huang@intel.com, 21cnbao@gmail.com, akpm@linux-foundation.org Cc: nanhai.zou@intel.com, wajdi.k.feghali@intel.com, vinodh.gopal@intel.com, kanchana.p.sridhar@intel.com Subject: [PATCH v2 4/4] mm: swap: Count successful mTHP ZSWAP stores in sysfs mTHP stats. Date: Thu, 15 Aug 2024 22:48:05 -0700 Message-Id: <20240816054805.5201-5-kanchana.p.sridhar@intel.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20240816054805.5201-1-kanchana.p.sridhar@intel.com> References: <20240816054805.5201-1-kanchana.p.sridhar@intel.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" If zswap_store() successfully stores an mTHP, it will be counted under the per-order sysfs "zswpout" stats: /sys/kernel/mm/transparent_hugepage/hugepages-*kB/stats/zswpout Other block dev/fs mTHP swap-out events will be counted under the existing sysfs "swpout" stats: /sys/kernel/mm/transparent_hugepage/hugepages-*kB/stats/swpout Signed-off-by: Kanchana P Sridhar --- mm/page_io.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/mm/page_io.c b/mm/page_io.c index ff8c99ee3af7..debd04fbdfd0 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -172,6 +172,12 @@ int generic_swapfile_activate(struct swap_info_struct = *sis, goto out; } =20 +static inline void count_mthp_zswpout_vm_event(struct folio *folio) +{ + if (IS_ENABLED(CONFIG_THP_SWAP)) + count_mthp_stat(folio_order(folio), MTHP_STAT_ZSWPOUT); +} + /* * We may have stale swap cache pages in memory: notice * them here and get rid of the unnecessary final write. @@ -196,6 +202,7 @@ int swap_writepage(struct page *page, struct writeback_= control *wbc) return ret; } if (zswap_store(folio)) { + count_mthp_zswpout_vm_event(folio); folio_unlock(folio); return 0; } --=20 2.27.0