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Thu, 22 Jan 2026 06:31:48 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id vbnsEFTEcWnTdwAAD6G6ig (envelope-from ); Thu, 22 Jan 2026 06:31:48 +0000 Message-ID: <6b48cc0f-f006-4d4c-af76-55f86f4267e3@suse.cz> Date: Thu, 22 Jan 2026 07:31:47 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 19/21] slab: remove frozen slab checks from __slab_free() Content-Language: en-US To: Suren Baghdasaryan Cc: Harry Yoo , Petr Tesarik , Christoph Lameter , David Rientjes , Roman Gushchin , Hao Li , Andrew Morton , Uladzislau Rezki , "Liam R. Howlett" , Sebastian Andrzej Siewior , Alexei Starovoitov , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-rt-devel@lists.linux.dev, bpf@vger.kernel.org, kasan-dev@googlegroups.com References: <20260116-sheaves-for-all-v3-0-5595cb000772@suse.cz> <20260116-sheaves-for-all-v3-19-5595cb000772@suse.cz> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Stat-Signature: ctfrpbe5u7txyoigzra1gg9jgxh1k46q X-Rspamd-Queue-Id: 5F1DDC0003 X-Rspam-User: X-HE-Tag: 1769063510-364530 X-HE-Meta: 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 V/BXAnrL 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 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 1/22/26 01:54, Suren Baghdasaryan wrote: > On Fri, Jan 16, 2026 at 2:41 PM Vlastimil Babka wrote: >> >> Currently slabs are only frozen after consistency checks failed. This >> can happen only in caches with debugging enabled, and those use >> free_to_partial_list() for freeing. The non-debug operation of >> __slab_free() can thus stop considering the frozen field, and we can >> remove the FREE_FROZEN stat. >> >> Reviewed-by: Suren Baghdasaryan >> Signed-off-by: Vlastimil Babka > > Functionally looks fine to me. Do we need to do something about the > UAPI breakage that removal of a sysfs node might cause? Only if someone complains. Just this week it has been reiterated by Linus: https://lore.kernel.org/all/CAHk-%3Dwga8Qu0-OSE9VZbviq9GuqwhPhLUXeAt-S7_9%2BfMCLkKg@mail.gmail.com/ Given this is behing a config no distro enables, I think chances are good noone will complain: https://oracle.github.io/kconfigs/?config=UTS_RELEASE&config=SLUB_STATS > Reviewed-by: Suren Baghdasaryan > >> --- >> mm/slub.c | 22 ++++------------------ >> 1 file changed, 4 insertions(+), 18 deletions(-) >> >> diff --git a/mm/slub.c b/mm/slub.c >> index 476a279f1a94..7ec7049c0ca5 100644 >> --- a/mm/slub.c >> +++ b/mm/slub.c >> @@ -333,7 +333,6 @@ enum stat_item { >> FREE_RCU_SHEAF_FAIL, /* Failed to free to a rcu_free sheaf */ >> FREE_FASTPATH, /* Free to cpu slab */ >> FREE_SLOWPATH, /* Freeing not to cpu slab */ >> - FREE_FROZEN, /* Freeing to frozen slab */ >> FREE_ADD_PARTIAL, /* Freeing moves slab to partial list */ >> FREE_REMOVE_PARTIAL, /* Freeing removes last object */ >> ALLOC_FROM_PARTIAL, /* Cpu slab acquired from node partial list */ >> @@ -5103,7 +5102,7 @@ static void __slab_free(struct kmem_cache *s, struct slab *slab, >> unsigned long addr) >> >> { >> - bool was_frozen, was_full; >> + bool was_full; >> struct freelist_counters old, new; >> struct kmem_cache_node *n = NULL; >> unsigned long flags; >> @@ -5126,7 +5125,6 @@ static void __slab_free(struct kmem_cache *s, struct slab *slab, >> old.counters = slab->counters; >> >> was_full = (old.freelist == NULL); >> - was_frozen = old.frozen; >> >> set_freepointer(s, tail, old.freelist); >> >> @@ -5139,7 +5137,7 @@ static void __slab_free(struct kmem_cache *s, struct slab *slab, >> * to (due to not being full anymore) the partial list. >> * Unless it's frozen. >> */ >> - if ((!new.inuse || was_full) && !was_frozen) { >> + if (!new.inuse || was_full) { >> >> n = get_node(s, slab_nid(slab)); >> /* >> @@ -5158,20 +5156,10 @@ static void __slab_free(struct kmem_cache *s, struct slab *slab, >> } while (!slab_update_freelist(s, slab, &old, &new, "__slab_free")); >> >> if (likely(!n)) { >> - >> - if (likely(was_frozen)) { >> - /* >> - * The list lock was not taken therefore no list >> - * activity can be necessary. >> - */ >> - stat(s, FREE_FROZEN); >> - } >> - >> /* >> - * In other cases we didn't take the list_lock because the slab >> - * was already on the partial list and will remain there. >> + * We didn't take the list_lock because the slab was already on >> + * the partial list and will remain there. >> */ >> - >> return; >> } >> >> @@ -8721,7 +8709,6 @@ STAT_ATTR(FREE_RCU_SHEAF, free_rcu_sheaf); >> STAT_ATTR(FREE_RCU_SHEAF_FAIL, free_rcu_sheaf_fail); >> STAT_ATTR(FREE_FASTPATH, free_fastpath); >> STAT_ATTR(FREE_SLOWPATH, free_slowpath); >> -STAT_ATTR(FREE_FROZEN, free_frozen); >> STAT_ATTR(FREE_ADD_PARTIAL, free_add_partial); >> STAT_ATTR(FREE_REMOVE_PARTIAL, free_remove_partial); >> STAT_ATTR(ALLOC_FROM_PARTIAL, alloc_from_partial); >> @@ -8826,7 +8813,6 @@ static struct attribute *slab_attrs[] = { >> &free_rcu_sheaf_fail_attr.attr, >> &free_fastpath_attr.attr, >> &free_slowpath_attr.attr, >> - &free_frozen_attr.attr, >> &free_add_partial_attr.attr, >> &free_remove_partial_attr.attr, >> &alloc_from_partial_attr.attr, >> >> -- >> 2.52.0 >>