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Wed, 12 Apr 2023 09:49:30 -0700 (PDT) MIME-Version: 1.0 References: <20230410073228.23043-1-jaewon31.kim@samsung.com> <20230412085726epcms1p7d2bec2526e47bd10a3b6ea6a113c9cc3@epcms1p7> <20230412094440epcms1p445319579ead0d0576bb616ebb07501b4@epcms1p4> <20230412113759epcms1p8cb15b54e3a96c7616419cb030d16f804@epcms1p8> In-Reply-To: <20230412113759epcms1p8cb15b54e3a96c7616419cb030d16f804@epcms1p8> From: "T.J. Mercier" Date: Wed, 12 Apr 2023 09:49:19 -0700 Message-ID: Subject: Re: [PATCH v3] dma-buf/heaps: system_heap: avoid too much allocation To: jaewon31.kim@samsung.com Cc: Michal Hocko , "jstultz@google.com" , "sumit.semwal@linaro.org" , "daniel.vetter@ffwll.ch" , "akpm@linux-foundation.org" , "hannes@cmpxchg.org" , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "jaewon31.kim@gmail.com" Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: A3E13C0006 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: 5b67h8iuzf4kz89nwm4j8efz8yztf9n7 X-HE-Tag: 1681318171-72552 X-HE-Meta: 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 Ja1dBfi1 UFIptaopNQV+gg9ORYPx+//dDydjaQbTShSMGmwJ1iJyBB3DgnvTNWlPbxRwS3QTjIo4OU0/wJaklfw/FvlGkAhvwIxcAHKNm0w13NNwu8NvDQ4Y2+fyYP1GlxsYMV6CWSZiVw6aQDfTP/6rqdQeD/BiELvLxnBMu2dxNdGsG+u8EjC7e9TYHn37pSuXuJu86cvtruP4/iCXJ5wTJgPnM4jGNkoi/8EfEJzr9+Te3h2utfSZY0ixkjUj5kma5azZ3JUcY9RwtVjQIZOdvALkUVW+03RHcCrxtCEMSAlvmOE/8gx3+A6zx1KTLNpKscBXMe0dDQvp2LtH6JsNLNvJ4aBIH5c2FfziKEG2sZKJhSTvJCBABOUnKdLPjLovwumEzmwTJME5tPh6XSnzvQy0KgezIX21GMj+ncle5WY0JKg2fFNk= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000003, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Apr 12, 2023 at 4:38=E2=80=AFAM Jaewon Kim wrote: > Yes I think you're right. As a allocator, dma-buf system heap looks to be= loose > in memory allocation. Limiting dmabuf memory may be required. But I think= there > is no nice and reasonable way so far. And the dma-buf system heap is bein= g > widely used in Android mobile system. AFAIK the camera consumes huge memo= ry > through this dma-buf system heap. I actually even looked a huge size requ= est > over 2GB in one dma-buf request. > Hey can you point me to where you saw a request that big? That's a non-buggy request?!