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[PATCH v3 2/2] mm: tlb: add tlb swap entries batch async release To: Barry Song <21cnbao@gmail.com> Cc: David Hildenbrand , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Will Deacon , "Aneesh Kumar K.V" , Nick Piggin , Peter Zijlstra , Arnd Bergmann , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , linux-arch@vger.kernel.org, cgroups@vger.kernel.org, opensource.kernel@vivo.com References: <20240805153639.1057-1-justinjiang@vivo.com> <20240805153639.1057-3-justinjiang@vivo.com> From: zhiguojiang In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-ClientProxiedBy: SI2PR04CA0015.apcprd04.prod.outlook.com (2603:1096:4:197::21) To JH0PR06MB6849.apcprd06.prod.outlook.com (2603:1096:990:47::12) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: JH0PR06MB6849:EE_|TY0PR06MB5404:EE_ X-MS-Office365-Filtering-Correlation-Id: 978e4894-e1f9-42df-de90-08dcd17ad3ac 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U2FsdGVkX18mjG1xkc10kLpnGMm4MuSYI84JcPMLY7WsDMXa/lccnjFg+PQsdGbXbqtI78K7F0XvsPLHOUwVW2bPl4ioz764vR0w8UIM8jIIVDyigv3csVYcJAeIWYbfoRxMfQlEsYRYrjo+aDaWC8Uy1QrT5GeiCtxaW6LoB74Y2GJIINtONTLnsLnFfHRAGqPuyv2+lTdiq2z31nwtqGKb0SB8QuECkHw2iHZkB5wsryjiYfhqzXKM7VLlVcK/MU+MY0YFxRpKED6EyhcuaLWJBiy9a3iVAVc5STBjOA56QKaFSf4bXphnq/u/nyhBJVFEW8Ay0MzRaDXx2aQktT/du7lvx0X4W1tb3kM3VJJxw3AJcy31l8mHOzWA3IwFDv5iyE76EgRJ3VZhpoMxyjtc1jbcsDVY//NB0dT27Terr7f4JxM1k/Ia+nC0bV30fUe6Jt4lBDo7hcoRe+yDMlD6HPMB2IhHFp7zowWY2Rh7x6mMDZ1Qa3rj00tLztMJhJQlpOzlDz5C0qkVwpBLPyFhWsJAEVDsurYJNebVGR133dDUZYQMyiNY3PcTN3NCzLe3iFWBgrwHMFSO3+SeN9RqrN6q3HxQKp+SlUZ1jCokQrMiBfOllL2Rtxb9xFkUm3Nr8Lee5wRXeP532ZSeoXv/4EAY9EcPx8wXfukkJVWB0KQjik8n/JwSxlNPvKPR9DH4N9mblGxm95DbO2gYhquZCYfHx+I/snU2q3S8Nys231TtP/B3J800VQklULCnih/Ie6Pm+wmnsHYZ6a3WMsTzX8vGYWWf95iQaqCjVmE1BorgPVTO5JyadWWWRAX046JfuFLRWuefWJ4CYIooG/qcFxog7oSPHdWGaJJ2tf+BzMy9G9gaHGBTjUk2cVu5OynosJTpUcIUo0aTNVTVMTe08rsya/+EpcMfNPBGi+GuMEyJBIP6aOvipPkqDN66OTyUWA8EEMlh2h9zUr1 CrGJ4PgA S1tZ3uGdMytWW4c04e3c9Mo9lY5kkTUsBeVdFtgWiN0Ks06wtXShChoDnDnbyUfxTE6ojw7xoRuQbLtu1pTP/J5ars1ztkeJTqBBKe21gO0XnGCACMdLnibb9tj1/NCVQO+HhiyIM7Pw9c0oNne4PV/2pC92+gRqPUgeVux1nf1cEgrDr3m/S7pwBM6amZMwmGSq4LT+UklxbOYnzH0sDDWh/DTtSOk4Fda3jBjkxqnYQlEVBC8GiRxydYJS015r3raTTEb9xZyWQpoq6CuwC7jnj5VY6ZEF3XETqkD/46Ej8B+8NOXYIOfwzcChrMEOxKg4G84LtNU5Ae80= 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: 在 2024/9/10 12:22, Barry Song 写道: > On Tue, Sep 10, 2024 at 2:44 AM zhiguojiang wrote: >> >> >> 在 2024/9/9 14:49, David Hildenbrand 写道: >>> On 05.08.24 17:36, Zhiguo Jiang wrote: >>>> One of the main reasons for the prolonged exit of the process with >>>> independent mm is the time-consuming release of its swap entries. >>>> The proportion of swap memory occupied by the process increases over >>>> time due to high memory pressure triggering to reclaim anonymous folio >>>> into swapspace, e.g., in Android devices, we found this proportion can >>>> reach 60% or more after a period of time. Additionally, the relatively >>>> lengthy path for releasing swap entries further contributes to the >>>> longer time required to release swap entries. >>>> >>>> Testing Platform: 8GB RAM >>>> Testing procedure: >>>> After booting up, start 15 processes first, and then observe the >>>> physical memory size occupied by the last launched process at different >>>> time points. >>>> Example: The process launched last: com.qiyi.video >>>> | memory type | 0min | 1min | 5min | 10min | 15min | >>>> ------------------------------------------------------------------- >>>> | VmRSS(KB) | 453832 | 252300 | 204364 | 199944 | 199748 | >>>> | RssAnon(KB) | 247348 | 99296 | 71268 | 67808 | 67660 | >>>> | RssFile(KB) | 205536 | 152020 | 132144 | 131184 | 131136 | >>>> | RssShmem(KB) | 1048 | 984 | 952 | 952 | 952 | >>>> | VmSwap(KB) | 202692 | 334852 | 362880 | 366340 | 366488 | >>>> | Swap ratio(%) | 30.87% | 57.03% | 63.97% | 64.69% | 64.72% | >>>> Note: min - minute. >>>> >>>> When there are multiple processes with independent mm and the high >>>> memory pressure in system, if the large memory required process is >>>> launched at this time, system will is likely to trigger the >>>> instantaneous >>>> killing of many processes with independent mm. Due to multiple exiting >>>> processes occupying multiple CPU core resources for concurrent >>>> execution, >>>> leading to some issues such as the current non-exiting and important >>>> processes lagging. >>>> >>>> To solve this problem, we have introduced the multiple exiting process >>>> asynchronous swap entries release mechanism, which isolates and caches >>>> swap entries occupied by multiple exiting processes, and hands them over >>>> to an asynchronous kworker to complete the release. This allows the >>>> exiting processes to complete quickly and release CPU resources. We have >>>> validated this modification on the Android products and achieved the >>>> expected benefits. >>>> >>>> Testing Platform: 8GB RAM >>>> Testing procedure: >>>> After restarting the machine, start 15 app processes first, and then >>>> start the camera app processes, we monitor the cold start and preview >>>> time datas of the camera app processes. >>>> >>>> Test datas of camera processes cold start time (unit: millisecond): >>>> | seq | 1 | 2 | 3 | 4 | 5 | 6 | average | >>>> | before | 1498 | 1476 | 1741 | 1337 | 1367 | 1655 | 1512 | >>>> | after | 1396 | 1107 | 1136 | 1178 | 1071 | 1339 | 1204 | >>>> >>>> Test datas of camera processes preview time (unit: millisecond): >>>> | seq | 1 | 2 | 3 | 4 | 5 | 6 | average | >>>> | before | 267 | 402 | 504 | 513 | 161 | 265 | 352 | >>>> | after | 188 | 223 | 301 | 203 | 162 | 154 | 205 | >>>> >>>> Base on the average of the six sets of test datas above, we can see that >>>> the benefit datas of the modified patch: >>>> 1. The cold start time of camera app processes has reduced by about 20%. >>>> 2. The preview time of camera app processes has reduced by about 42%. >>>> >>>> It offers several benefits: >>>> 1. Alleviate the high system cpu loading caused by multiple exiting >>>> processes running simultaneously. >>>> 2. Reduce lock competition in swap entry free path by an asynchronous >>>> kworker instead of multiple exiting processes parallel execution. >>>> 3. Release pte_present memory occupied by exiting processes more >>>> efficiently. >>>> >>>> Signed-off-by: Zhiguo Jiang >>>> --- >>>> arch/s390/include/asm/tlb.h | 8 + >>>> include/asm-generic/tlb.h | 44 ++++++ >>>> include/linux/mm_types.h | 58 +++++++ >>>> mm/memory.c | 3 +- >>>> mm/mmu_gather.c | 296 ++++++++++++++++++++++++++++++++++++ >>>> 5 files changed, 408 insertions(+), 1 deletion(-) >>>> >>>> diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h >>>> index e95b2c8081eb..3f681f63390f >>>> --- a/arch/s390/include/asm/tlb.h >>>> +++ b/arch/s390/include/asm/tlb.h >>>> @@ -28,6 +28,8 @@ static inline bool __tlb_remove_page_size(struct >>>> mmu_gather *tlb, >>>> struct page *page, bool delay_rmap, int page_size); >>>> static inline bool __tlb_remove_folio_pages(struct mmu_gather *tlb, >>>> struct page *page, unsigned int nr_pages, bool delay_rmap); >>>> +static inline bool __tlb_remove_swap_entries(struct mmu_gather *tlb, >>>> + swp_entry_t entry, int nr); >>> >>> The problem I am having is that swap entries don't have any >>> intersection with the TLB. It sounds like we're squeezing something >>> into an existing concept (MMU gather) that just doesn't belong in there. >> I referred to the mechanism of batch release in tlb, and perhaps a new >> structure needs to be created to implement this feature. > We already use swap_slots_cache to collect multiple swap entries and > free them in > batches. Would it be better to incorporate our new logic there? might > be much less > change and don't need to touch zap_pte_range() ? for example, while slot_caches > are almost full, wake up the async thread to free? Or, do you think > that cache->free_lock > is also a contended lock? There should be no need to add mmu_swap_batch logic in the sync release method, and this may lead to repetitive logic. The number of async threads for releasing slot_caches seems also uncertain for a large number of CPUs architectures. The cache->free_lock is a percpu spinlock, which will disable preemption, so I guess there should be no lock contention issue with it. I understand that you want to incorporate this feature through sync manner, and I think it may be a bit difficult. > >> Thanks >> Zhiguo >> > Thanks > Barry Thanks Zhiguo