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X-CSE-ConnectionGUID: ClK2ZrgYQsWeTbMXuUWTPg== X-CSE-MsgGUID: c3eMWikdRTCEeG3wnucLGw== X-IronPort-AV: E=McAfee;i="6700,10204,11373"; a="47048692" X-IronPort-AV: E=Sophos;i="6.14,246,1736841600"; d="scan'208";a="47048692" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by fmvoesa106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2025 13:53:24 -0700 X-CSE-ConnectionGUID: kMLvpZk7SFOS6vLGJORBNw== X-CSE-MsgGUID: jVgeCFp6RzGoyP8JFWgKDw== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,246,1736841600"; d="scan'208";a="121376923" Received: from dnelso2-mobl.amr.corp.intel.com (HELO [10.125.108.212]) ([10.125.108.212]) by orviesa006-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2025 13:53:24 -0700 Message-ID: <785953484810b0b57bf1d366532e80f4be3329de.camel@linux.intel.com> Subject: Re: [PATCH 7/9] mm: swap: free each cluster individually in swap_entries_put_map_nr() From: Tim Chen To: Kemeng Shi , akpm@linux-foundation.org Cc: kasong@tencent.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Fri, 14 Mar 2025 13:53:23 -0700 In-Reply-To: <20250313210515.9920-8-shikemeng@huaweicloud.com> References: <20250313210515.9920-1-shikemeng@huaweicloud.com> <20250313210515.9920-8-shikemeng@huaweicloud.com> Autocrypt: addr=tim.c.chen@linux.intel.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.50.4 (3.50.4-1.fc39) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 On Fri, 2025-03-14 at 05:05 +0800, Kemeng Shi wrote: > 1. Factor out general swap_entries_put_map() helper to drop entries belon= g > to one cluster. If entries are last map, free entries in batch, otherwise > put entries with cluster lock acquired and released only once. > 2. Iterate and call swap_entries_put_map() for each cluster in > swap_entries_put_nr() to leverage batch-remove for last map belong to one > cluster and reduce lock acquire/release in fallback case. > 3. As swap_entries_put_nr() won't handle SWAP_HSA_CACHE drop, rename it t= o > swap_entries_put_map_nr(). >=20 > Signed-off-by: Kemeng Shi > --- > mm/swapfile.c | 58 +++++++++++++++++++++++++-------------------------- > 1 file changed, 29 insertions(+), 29 deletions(-) >=20 > diff --git a/mm/swapfile.c b/mm/swapfile.c > index 2d0f5d630211..ebac9ff74ba7 100644 > --- a/mm/swapfile.c > +++ b/mm/swapfile.c > @@ -1473,25 +1473,10 @@ struct swap_info_struct *get_swap_device(swp_entr= y_t entry) > return NULL; > } > =20 > -static unsigned char swap_entry_put(struct swap_info_struct *si, > - swp_entry_t entry) Need to update comment in free_swap_and_cache_nr() now that swap_entry_put(= ) goes away. * the swap once per folio in the common case. If we do * swap_entry_put() and __try_to_reclaim_swap() in the same loop, t= he * latter will get a reference and lock the folio for every individ= ual ... > +static bool swap_entries_put_map(struct swap_info_struct *si, > + swp_entry_t entry, int nr) > { > - struct swap_cluster_info *ci; > unsigned long offset =3D swp_offset(entry); > - unsigned char usage; > - > - ci =3D lock_cluster(si, offset); > - usage =3D swap_entry_put_locked(si, ci, entry, 1); > - unlock_cluster(ci); > - > - return usage; > -} > -