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[90.233.217.11]) by smtp.gmail.com with ESMTPSA id 38308e7fff4ca-3323a85d7c1sm28777831fa.68.2025.08.08.01.48.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 08 Aug 2025 01:48:30 -0700 (PDT) From: Uladzislau Rezki X-Google-Original-From: Uladzislau Rezki Date: Fri, 8 Aug 2025 10:48:27 +0200 To: Marco Elver Cc: "Uladzislau Rezki (Sony)" , linux-mm@kvack.org, Andrew Morton , Vlastimil Babka , Michal Hocko , Baoquan He , LKML , Alexander Potapenko , kasan-dev@googlegroups.com Subject: Re: [PATCH 0/8] __vmalloc() and no-block support Message-ID: References: <20250807075810.358714-1-urezki@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: 37DEFA0003 X-Stat-Signature: 3abeb9eaxffd8mzomqg6qctu8y84xazf X-Rspam-User: X-HE-Tag: 1754642912-94949 X-HE-Meta: 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 4+E89F2n 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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 Thu, Aug 07, 2025 at 01:01:00PM +0200, Marco Elver wrote: > On Thu, Aug 07, 2025 at 09:58AM +0200, Uladzislau Rezki (Sony) wrote: > > Hello. > > > > This is a second series of making __vmalloc() to support GFP_ATOMIC and > > GFP_NOWAIT flags. It tends to improve the non-blocking behaviour. > > > > The first one can be found here: > > > > https://lore.kernel.org/all/20250704152537.55724-1-urezki@gmail.com/ > > > > that was an RFC. Using this series for testing i have not found more > > places which can trigger: scheduling during atomic. Though there is > > one which requires attention. I will explain in [1]. > > > > Please note, non-blocking gets improved in the __vmalloc() call only, > > i.e. vmalloc_huge() still contains in its paths many cond_resched() > > points and can not be used as non-blocking as of now. > > > > [1] The vmap_pages_range_noflush() contains the kmsan_vmap_pages_range_noflush() > > external implementation for KCSAN specifically which is hard coded to GFP_KERNEL. > > The kernel should be built with CONFIG_KCSAN option. To me it looks like not > > straight forward to run such kernel on my box, therefore i need more time to > > investigate what is wrong with CONFIG_KCSAN and my env. > > KMSAN or KCSAN? > > [+Cc KMSAN maintainers] > Sorry for type, yes, that was about CONFIG_KMSAN. -- Uladzislau Rezki