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Sun, 04 Jan 2026 20:27:17 +0800 X-QQ-mid: xmsmtpt1767529637tjn4o49cv Message-ID: X-QQ-XMAILINFO: MMwjR1C73eIsZ8C984l31Xid8Z8Nty5k0BEMSfL2KaCwIFJ8BTPvIw92TXjjTn fr7HQPhyVMl3q6H6SAPCg62ck3uEH753h6B/Vu+rWlbg9zul2GjQan6mpmBKApOUMZC/1Px673Wp MGlGxzjRreaOOx60wDJEph76rptxRqBiwX6uJi9mmXsZhEJm4Iap8XF1ve5M46dFj004eu0Z6x96 9D/4Xre878I80YDtdf386OWO20vmqUdEMrRts4imm3qqdG8E+qFYf3/XHZonL74Cbrwbq7GWlLFU +4uVQladPMfzpHXhfXrRx/KG+Mzu0kPIKfkmxN1Zj2KjuiJF4tKqkMOdARQfJ8DBBBUzIp1gsp5B i+45bdKZcmuhABC+30Z507FkSpgWMmCH+dalPRqySI6CoCRDFcVcGkJXhTBKLN5YTjh/FoGTDODU WAxF7aOqL+xE78J1ybKtqVQ64O9MRHmiXzBI4Jbn2Kl5vh/c4mjOONZtWe4XbdlqkoNsvlaFfQuL SrVnx9kkJGPfW2IfLzqyCWFzwyfPjpT4kNwqqhqQJYKAiXic0Mz0TJZXSqxQOuN7FDTprVjsoTN7 VOX36hltNu5cApwQ/qQqkt+RITuwc/eJxzxD4tRY0Zbl2i9J/CKNqHMAPAQS/qyf4YFfgb6wes/x ESGzg0dJ2DzZnn1b2a/qMGH5W8rxpaKjJqcf3GhSexmlIsAPR0wJz45MSgkSjblxx83LC0EplIKA vgmNOSArsn9d2OTV62im55N2gM4F0yhCGdVNjxD5TtNbfIB0l2E3ghZ3rnC+dsojMtGfQ15nyi75 AtLZIg29vIDaQL4V/LJrkyxO+14zIGwVNQVeu0DX4XCayFvtfqpNo69dZgBZz9Sl+KTpI6WblfIZ eY0g+xCYyoqBQ50K1iaSeTnZ24S4hESOBfrEtJQ9rpopdvzAFyt/dLdcXuoTm2A3IVH3YVELpMT9 1YrGS2tTfd5ovOPjx6tk6EVip5tjOvHTklSNz8g+h6SqpEm1ujzaNBcjdFJbF/v/10TzkK4tk4+T mkUr9xrGH2F6FHzPhD5GS0pp5/OYd/dHku4FHJqPHhEM1l6d6c X-QQ-XMRINFO: OD9hHCdaPRBwH5bRRRw8tsiH4UAatJqXfg== From: wujing To: Andrew Morton , Vlastimil Babka Cc: Suren Baghdasaryan , Michal Hocko , Brendan Jackman , Johannes Weiner , Zi Yan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Qiliang Yuan , wujing Subject: [PATCH 1/1] mm/page_alloc: auto-tune min_free_kbytes on atomic allocation failure Date: Sun, 4 Jan 2026 20:26:52 +0800 X-OQ-MSGID: <20260104122652.1219035-1-realwujing@qq.com> X-Mailer: git-send-email 2.39.5 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 4B70B20003 X-Stat-Signature: xbncu5xeieyfjhq8dp5x6g8t143qbkew X-Rspam-User: X-HE-Tag: 1767529643-581903 X-HE-Meta: U2FsdGVkX1/nX6SsylKokWLo5CilERWrixqgzLLtcAjjxUkdkrqzuXxovFHLvkytlFD54F3ZIvWQicPad9lXLC6N14fQeFvQPbhE8MkH/Z0PbQ7fLtbvZx9ytdFoEyiyvQ+hGdyx8CfPGX8tc+15JG8agE6qPY2KCrPXEjRFKTQ6ooy1myCY//6NxiiL5Z/243vkcmOkGsR9ci3mCbbNSqiBvxuGSotmOZZDWm1S8sNeOM+q5R6tpnRxMVjd9a2/RdD4RyTNDOxnxD2sEyy2kpSTDjQqPTiM5zsm7ezc9qKt8RAqzNulBOc11FgtGi3Ohzj7op5vJ5KRgp8Isu4l837DHMs36aNSMn22wnBh9Jn4ufVhWCYaNFLgXR7yrjHZKcnklWw8+4M+MpBZB/yuoWFcUEb7pTaHiwvq+ljUbvPbqelCCJkEjaqzFG1Sd23gI+/bdyv/ddqzKWXc5y3aW24n9WnfZK0UNY2KcAQTxM6mRZtVCXuHT9VQtutQ9ypQ7YJ7T/ZZ4zJiB2dPu+H48DEeOIKhJnEbwN+PgN5nMwv4iGe1EjoXNkN8uztmIIBzScua7cfvee72RG9ipSBvmQ716JkF+/ISRMJRWCEJt/Td97Q+JpaVbGcFyKtM2eQ5HYHtapQtemIRxSQebNX8gf2Tlm1NZQg+ihroMU+aRe4MaYj3ICf3nVHlx0xWhIzCdXNPjbOKUdKJzcJaAuOYI6yr/cpKRoWlD9tt2pQzU7pHwdQms/EdamwTFxtRWtsyHpLKGzGwcRSW24a4IHDOdPi8IJdJ9YgL7vpfI0ocfxQWG1OWTuB/Mhha7bVVW1fDsOv2VZvN2XiliF7g/Se5v2A0fkzR5AYdYAc/1o7zl7Thafl9afhl2m2P9i9Mv8hwXNvujirVa/lVF2xvrR9pY+m5Jb6kafeZ0JluZ4t7l2W/MZ0hjHCUlZ2mmrgvVLYpoXqzssLT9l+8MfSYP72 JF9B0rbE PK9tNQBy/C9gXZARtR78LxTIXQnUCUWQGVIYuGlWPZMYoEl78a7CqPPpbv2tmQhnRWGuOugkreBSFB0mqEpaY8bGeVctqhTr7JI1xVzhc2hGnkCGKQW6L9sxkljMylQxGM0+EBgnTh7WNBkLfkD3AqgrPeNJGTTnhsWjQHNv9HEQScwgA5Vh8YdBscljY2IJ70R/VCgE0pauqbWEsvqFiOoF1vxnI0sHX4N6wffLMzyVVYt0J5cL/ZKlR3oSBkXowvEqfr8LIW9XDpKBO4BSbbNynXxTE2T2D82YEJlMZl8Ernafr2s+Aq6Gcfg== 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: Introduce a mechanism to dynamically increase vm.min_free_kbytes when critical atomic allocations (GFP_ATOMIC, order-0) fail. This prevents recurring network packet drops or other atomic failures by proactively reserving more memory. The adjustment doubles min_free_kbytes upon upon failure (exponential backoff), capped at 1% of total RAM. Observed failure logs: [38535641.026406] node 0: slabs: 941, objs: 54656, free: 0 [38535641.037711] node 1: slabs: 349, objs: 22096, free: 272 [38535641.049025] node 1: slabs: 349, objs: 22096, free: 272 [38535642.795972] SLUB: Unable to allocate memory on node -1, gfp=0x480020(GFP_ATOMIC) [38535642.805017] cache: skbuff_head_cache, object size: 232, buffer size: 256, default order: 2, min order: 0 [38535642.816311] node 0: slabs: 854, objs: 42320, free: 0 [38535642.823066] node 1: slabs: 400, objs: 25360, free: 294 [38535643.070199] SLUB: Unable to allocate memory on node -1, gfp=0x480020(GFP_ATOMIC) [38535643.078861] cache: skbuff_head_cache, object size: 232, buffer size: 256, default order: 2, min order: 0 [38535643.089719] node 0: slabs: 841, objs: 41824, free: 0 [38535643.096513] node 1: slabs: 393, objs: 24480, free: 272 [38535643.484149] SLUB: Unable to allocate memory on node -1, gfp=0x480020(GFP_ATOMIC) [38535643.492831] cache: skbuff_head_cache, object size: 232, buffer size: 256, default order: 2, min order: 0 [38535643.503666] node 0: slabs: 898, objs: 43120, free: 159 [38535643.510140] node 1: slabs: 404, objs: 25424, free: 319 [38535644.699224] SLUB: Unable to allocate memory on node -1, gfp=0x480020(GFP_ATOMIC) [38535644.707911] cache: skbuff_head_cache, object size: 232, buffer size: 256, default order: 2, min order: 0 [38535644.718700] node 0: slabs: 1031, objs: 43328, free: 0 [38535644.725059] node 1: slabs: 339, objs: 17616, free: 317 [38535645.428345] SLUB: Unable to allocate memory on node -1, gfp=0x480020(GFP_ATOMIC) [38535645.436888] cache: skbuff_head_cache, object size: 232, buffer size: 256, default order: 2, min order: 0 [38535645.447664] node 0: slabs: 940, objs: 40864, free: 144 [38535645.454026] node 1: slabs: 322, objs: 19168, free: 383 [38535645.556122] SLUB: Unable to allocate memory on node -1, gfp=0x480020(GFP_ATOMIC) [38535645.564576] cache: skbuff_head_cache, object size: 232, buffer size: 256, default order: 2, min order: 0 [38535649.655523] warn_alloc: 59 callbacks suppressed [38535649.655527] swapper/100: page allocation failure: order:0, mode:0x480020(GFP_ATOMIC), nodemask=(null) [38535649.671692] swapper/100 cpuset=/ mems_allowed=0-1 Signed-off-by: wujing Signed-off-by: Qiliang Yuan --- mm/page_alloc.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index c380f063e8b7..9a24e2b6cfbf 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -30,6 +30,7 @@ #include #include #include +#include #include #include #include @@ -3975,6 +3976,9 @@ static void warn_alloc_show_mem(gfp_t gfp_mask, nodemask_t *nodemask) mem_cgroup_show_protected_memory(NULL); } +static void boost_min_free_kbytes_workfn(struct work_struct *work); +static DECLARE_WORK(boost_min_free_kbytes_work, boost_min_free_kbytes_workfn); + void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...) { struct va_format vaf; @@ -4947,6 +4951,10 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order, goto retry; } fail: + /* Auto-tuning: trigger boost if atomic allocation fails */ + if ((gfp_mask & GFP_ATOMIC) && order == 0) + schedule_work(&boost_min_free_kbytes_work); + warn_alloc(gfp_mask, ac->nodemask, "page allocation failure: order:%u", order); got_pg: @@ -7682,3 +7690,28 @@ struct page *alloc_pages_nolock_noprof(gfp_t gfp_flags, int nid, unsigned int or return page; } EXPORT_SYMBOL_GPL(alloc_pages_nolock_noprof); + +static void boost_min_free_kbytes_workfn(struct work_struct *work) +{ + int new_min; + + /* Cap at 1% of total RAM for safety */ + unsigned long total_kbytes = totalram_pages() << (PAGE_SHIFT - 10); + int max_limit = total_kbytes / 100; + + /* Exponential increase: double the current value */ + new_min = min_free_kbytes * 2; + + if (new_min > max_limit) + new_min = max_limit; + + if (new_min > min_free_kbytes) { + min_free_kbytes = new_min; + /* Update user_min_free_kbytes so it persists through recalculations */ + if (new_min > user_min_free_kbytes) + user_min_free_kbytes = new_min; + + setup_per_zone_wmarks(); + pr_info("Auto-tuning: unexpected atomic failure detected, increasing min_free_kbytes to %d\n", min_free_kbytes); + } +} -- 2.39.5