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X-CSE-ConnectionGUID: PO007WEDS5qjlZAsV7/z6Q== X-CSE-MsgGUID: jAeBxiuARjeGAt3XouRMZg== X-IronPort-AV: E=McAfee;i="6700,10204,11373"; a="43187565" X-IronPort-AV: E=Sophos;i="6.14,246,1736841600"; d="scan'208";a="43187565" Received: from orviesa008.jf.intel.com ([10.64.159.148]) by orvoesa109.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2025 13:37:12 -0700 X-CSE-ConnectionGUID: meas/1QGQ66R85WAgFb4PQ== X-CSE-MsgGUID: O4xvvHE/SpqHWFuEd5AW2Q== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.14,246,1736841600"; d="scan'208";a="122325334" Received: from dnelso2-mobl.amr.corp.intel.com (HELO [10.125.108.212]) ([10.125.108.212]) by orviesa008-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 14 Mar 2025 13:37:11 -0700 Message-ID: Subject: Re: [PATCH 1/9] mm: swap: rename __swap_[entry/entries]_free[_locked] to swap_[entry/entries]_put[_locked] 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 13:37:11 -0700 In-Reply-To: <20250313210515.9920-2-shikemeng@huaweicloud.com> References: <20250313210515.9920-1-shikemeng@huaweicloud.com> <20250313210515.9920-2-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) MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Queue-Id: 19D5320006 X-Rspamd-Server: rspam08 X-Stat-Signature: 4h9eyhhx41kjj54g44ndjw63ynz37sz5 X-HE-Tag: 1741984632-173891 X-HE-Meta: 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 N16GFNsG P7h1SEf7oznML3WIK13A0k7wdL0zppBPuMNtIdiGWb3kJtj6AO0T3nniHQWt4d7DYvYlKPB1PyR932Ea+q3giPAzRIuv38dGV14knhguLa7SMMMsRc1Pzeab5iDMp7V0VWAK25u73IWerYNp65pc0i/XaEBhb8FamqomLpbWL3hzbUwxDDlsRiLg0wXOHXRHlGzqsA998GAotyXXD8MC9lzxGWeWURCM3GLi32IJpp0hgj+4= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 2025-03-14 at 05:05 +0800, Kemeng Shi wrote: > In __swap_entry_free[_locked] and __swap_entries_free, we decrease count > first and only free swap entry if count drops to zero. This behavior is > more akin to a put() operation rather than a free() operation. Therefore, > rename these functions with "put" instead of "free". > Additionally, add "_nr" suffix to swap_entries_put to indicate the input > range may span swap clusters. >=20 Reviewed-by: Tim Chen > Signed-off-by: Kemeng Shi > --- > mm/swapfile.c | 28 ++++++++++++++-------------- > 1 file changed, 14 insertions(+), 14 deletions(-) >=20 > diff --git a/mm/swapfile.c b/mm/swapfile.c > index 628f67974a7c..5a775456e26c 100644 > --- a/mm/swapfile.c > +++ b/mm/swapfile.c > @@ -1347,9 +1347,9 @@ static struct swap_info_struct *_swap_info_get(swp_= entry_t entry) > return NULL; > } > =20 > -static unsigned char __swap_entry_free_locked(struct swap_info_struct *s= i, > - unsigned long offset, > - unsigned char usage) > +static unsigned char swap_entry_put_locked(struct swap_info_struct *si, > + unsigned long offset, > + unsigned char usage) > { > unsigned char count; > unsigned char has_cache; > @@ -1453,15 +1453,15 @@ struct swap_info_struct *get_swap_device(swp_entr= y_t entry) > return NULL; > } > =20 > -static unsigned char __swap_entry_free(struct swap_info_struct *si, > - swp_entry_t entry) > +static unsigned char swap_entry_put(struct swap_info_struct *si, > + swp_entry_t entry) > { > struct swap_cluster_info *ci; > unsigned long offset =3D swp_offset(entry); > unsigned char usage; > =20 > ci =3D lock_cluster(si, offset); > - usage =3D __swap_entry_free_locked(si, offset, 1); > + usage =3D swap_entry_put_locked(si, offset, 1); > if (!usage) > swap_entry_range_free(si, ci, swp_entry(si->type, offset), 1); > unlock_cluster(ci); > @@ -1469,8 +1469,8 @@ static unsigned char __swap_entry_free(struct swap_= info_struct *si, > return usage; > } > =20 > -static bool __swap_entries_free(struct swap_info_struct *si, > - swp_entry_t entry, int nr) > +static bool swap_entries_put_nr(struct swap_info_struct *si, > + swp_entry_t entry, int nr) > { > unsigned long offset =3D swp_offset(entry); > unsigned int type =3D swp_type(entry); > @@ -1501,7 +1501,7 @@ static bool __swap_entries_free(struct swap_info_st= ruct *si, > fallback: > for (i =3D 0; i < nr; i++) { > if (data_race(si->swap_map[offset + i])) { > - count =3D __swap_entry_free(si, swp_entry(type, offset + i)); > + count =3D swap_entry_put(si, swp_entry(type, offset + i)); > if (count =3D=3D SWAP_HAS_CACHE) > has_cache =3D true; > } else { > @@ -1552,7 +1552,7 @@ static void cluster_swap_free_nr(struct swap_info_s= truct *si, > =20 > ci =3D lock_cluster(si, offset); > do { > - if (!__swap_entry_free_locked(si, offset, usage)) > + if (!swap_entry_put_locked(si, offset, usage)) > swap_entry_range_free(si, ci, swp_entry(si->type, offset), 1); > } while (++offset < end); > unlock_cluster(ci); > @@ -1599,7 +1599,7 @@ void put_swap_folio(struct folio *folio, swp_entry_= t entry) > swap_entry_range_free(si, ci, entry, size); > else { > for (int i =3D 0; i < size; i++, entry.val++) { > - if (!__swap_entry_free_locked(si, offset + i, SWAP_HAS_CACHE)) > + if (!swap_entry_put_locked(si, offset + i, SWAP_HAS_CACHE)) > swap_entry_range_free(si, ci, entry, 1); > } > } > @@ -1798,7 +1798,7 @@ void free_swap_and_cache_nr(swp_entry_t entry, int = nr) > /* > * First free all entries in the range. > */ > - any_only_cache =3D __swap_entries_free(si, entry, nr); > + any_only_cache =3D swap_entries_put_nr(si, entry, nr); > =20 > /* > * Short-circuit the below loop if none of the entries had their > @@ -1811,7 +1811,7 @@ void free_swap_and_cache_nr(swp_entry_t entry, int = nr) > * Now go back over the range trying to reclaim the swap cache. This is > * more efficient for large folios because we will only try to reclaim > * the swap once per folio in the common case. If we do > - * __swap_entry_free() and __try_to_reclaim_swap() in the same loop, th= e > + * swap_entry_put() and __try_to_reclaim_swap() in the same loop, the > * latter will get a reference and lock the folio for every individual > * page but will only succeed once the swap slot for every subpage is > * zero. > @@ -3758,7 +3758,7 @@ int add_swap_count_continuation(swp_entry_t entry, = gfp_t gfp_mask) > * into, carry if so, or else fail until a new continuation page is allo= cated; > * when the original swap_map count is decremented from 0 with continuat= ion, > * borrow from the continuation and report whether it still holds more. > - * Called while __swap_duplicate() or caller of __swap_entry_free_locked= () > + * Called while __swap_duplicate() or caller of swap_entry_put_locked() > * holds cluster lock. > */ > static bool swap_count_continued(struct swap_info_struct *si,