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Fri, 11 Jul 2025 15:43:16 +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 VtBYJxQxcWhtawAAD6G6ig (envelope-from ); Fri, 11 Jul 2025 15:43:16 +0000 Message-ID: <5bc89531-ab09-4690-aae4-a44f9ddb4a68@suse.cz> Date: Fri, 11 Jul 2025 17:43:16 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v12 2/4] mm/slub: allow to set node and align in k[v]realloc Content-Language: en-US To: Harry Yoo , Vitaly Wool Cc: linux-mm@kvack.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, Uladzislau Rezki , Danilo Krummrich , Alice Ryhl , rust-for-linux@vger.kernel.org, Lorenzo Stoakes , "Liam R . Howlett" , Kent Overstreet , linux-bcachefs@vger.kernel.org, bpf@vger.kernel.org, Herbert Xu , Jann Horn , Pedro Falcato References: <20250709172345.1031907-1-vitaly.wool@konsulko.se> <20250709172441.1032006-1-vitaly.wool@konsulko.se> 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: 7bit X-Rspamd-Queue-Id: A491AA0002 X-Stat-Signature: rkfkefj4kpu1eg5sm3w4ozjaaf8kzn5a X-Rspam-User: X-Rspamd-Server: rspam07 X-HE-Tag: 1752248598-125292 X-HE-Meta: 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 Mes9/Mrb QD/xhL+CGeVs/QUN8z8xgmyjkv2v92rGYo+RpVtikK2GSvtUg7EoEScXAMQuoEGxsr0r9HWcYbtQ6he4FSVMDP7FKw3XkyHWEM4veXxD42AqgJ1AKNtdCST7w5m1gDqFhro46XlWsQ798Q4bdHrGoFK0O/30Q0cMLw+d6wxqcBUdRupL+bhtJFNuIPYnadFWT8Mzot+Q0PQNnmgsq1iaFUShaHx04hcJcX7351PaCM4uG59+C2ZBzwbuZdEnaWNn7xb65/3I60CpKAnlNmQi7O9X+ymIkA35vOszx 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 7/11/25 10:58, Harry Yoo wrote: > On Wed, Jul 09, 2025 at 07:24:41PM +0200, Vitaly Wool wrote: >> Reimplement k[v]realloc_node() to be able to set node and >> alignment should a user need to do so. In order to do that while >> retaining the maximal backward compatibility, add >> k[v]realloc_node_align() functions and redefine the rest of API >> using these new ones. >> >> While doing that, we also keep the number of _noprof variants to a >> minimum, which implies some changes to the existing users of older >> _noprof functions, that basically being bcachefs. >> >> With that change we also provide the ability for the Rust part of >> the kernel to set node and alignment in its K[v]xxx >> [re]allocations. >> >> Signed-off-by: Vitaly Wool >> --- >> fs/bcachefs/darray.c | 2 +- >> fs/bcachefs/util.h | 2 +- >> include/linux/bpfptr.h | 2 +- >> include/linux/slab.h | 38 +++++++++++++++---------- >> lib/rhashtable.c | 4 +-- >> mm/slub.c | 64 +++++++++++++++++++++++++++++------------- >> 6 files changed, 72 insertions(+), 40 deletions(-) > >> diff --git a/mm/slub.c b/mm/slub.c >> index c4b64821e680..6fad4cdea6c4 100644 >> --- a/mm/slub.c >> +++ b/mm/slub.c >> @@ -4845,7 +4845,7 @@ void kfree(const void *object) >> EXPORT_SYMBOL(kfree); >> >> static __always_inline __realloc_size(2) void * >> -__do_krealloc(const void *p, size_t new_size, gfp_t flags) >> +__do_krealloc(const void *p, size_t new_size, unsigned long align, gfp_t flags, int nid) >> { >> void *ret; >> size_t ks = 0; >> @@ -4859,6 +4859,20 @@ __do_krealloc(const void *p, size_t new_size, gfp_t flags) >> if (!kasan_check_byte(p)) >> return NULL; >> >> + /* refuse to proceed if alignment is bigger than what kmalloc() provides */ >> + if (!IS_ALIGNED((unsigned long)p, align) || new_size < align) >> + return NULL; > > Hmm but what happens if `p` is aligned to `align`, but the new object is not? > > For example, what will happen if we allocate object with size=64, align=64 > and then do krealloc with size=96, align=64... > > Or am I missing something? Good point. We extended the alignment guarantees in commit ad59baa31695 ("slab, rust: extend kmalloc() alignment guarantees to remove Rust padding") for rust in a way that size 96 gives you alignment of 32. It assumes that rust side will ask for alignments that are power-of-two and sizes that are multiples of alignment. I think if that assumption is still honored than this will keep working, but the check added above (is it just a sanity check or something the rust side relies on?) doesn't seem correct? >> + /* >> + * If reallocation is not necessary (e. g. the new size is less >> + * than the current allocated size), the current allocation will be >> + * preserved unless __GFP_THISNODE is set. In the latter case a new >> + * allocation on the requested node will be attempted. >> + */ >> + if (unlikely(flags & __GFP_THISNODE) && nid != NUMA_NO_NODE && >> + nid != page_to_nid(virt_to_page(p))) >> + goto alloc_new; >> + >> if (is_kfence_address(p)) { >> ks = orig_size = kfence_ksize(p); >> } else { >