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Wed, 07 Jun 2023 02:07:46 -0700 (PDT) Received: from ubuntu-hf2.default.svc.cluster.local ([101.127.248.173]) by smtp.gmail.com with ESMTPSA id q3-20020a17090311c300b001a69dfd918dsm9967076plh.187.2023.06.07.02.07.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 07 Jun 2023 02:07:46 -0700 (PDT) From: Haifeng Xu To: rppt@kernel.org Cc: mhocko@kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Haifeng Xu Subject: [PATCH] mm/mm_init.c: add debug messsge for dma zone Date: Wed, 7 Jun 2023 09:07:34 +0000 Message-Id: <20230607090734.1259-1-haifeng.xu@shopee.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: B0AE84000C X-Stat-Signature: iy76qnd1dgsbp1iepyt1rex4efzhrun6 X-HE-Tag: 1686128867-397118 X-HE-Meta: U2FsdGVkX1/7AhsRTGUk1Qj1UG7Kh+Ot8T+CU9N2XIvJ+bVRBd8q6xp9w6tt0YMEOo0ZADxub2oyXY4kLhRIi5hwtj2XZtGINJPzAvsYjbIQR/YT2v2mGYWVKCPnLuTGF4Xflf/eXRczPG08ApZvzjmqnKH1o8/GiXDHwIJIzZZoOB+3S6RlBWu4zvZyzV7d7/0JzVPw0pnDvHhqjLuVZDt+jFMVQrPbcg50bvIRJATrb/ms2nLsVqqVNvDdOuVNGslr1EsehVC+NRSNfXVl7nwJsUtBbrB7o2bRy5xaSKj8xRWWEvmkLqxWeDLRM5fXU0h2ArsfW/HRA6uZqH6xAAO0XMIX59T8Vz/8XNH9Gc8YhicU8aruTiwK9XpGv9iW06urhnVkNHV8ODdOjkbUim8nRpUCZ7ucJeOwotIq8FwbbeAHExMEm2S3vPmYoM5TL0Sz5N6ysJl9Ho/U9RydWmcd5C25k5e85Zmukqtwj7oE7ybyCIhuDo3E2GOguaBxPZ8b6FKDNGz5jbkY7I/hIQBZsopZlC2YU6cwx5jnUZHlI429GhStZjucL1uYiZxBzEvrrncFPJFXmbm2V0rjk2vejAPPiS38oZf7Y8s5Pady4NiSeXclnt1R2G0vnivSrwarzM0knFyq/W0Z7RlY3hYkbZRpdiPUi9Y7sW0jE4H2sKtWVixxmJPzubkMEoQ0YLZhrb53InCkwb2OdEMqFxaWOkyUcDBuyAot7E14PTpFOzfqAnJRYzzmgfBYQRfeQdplfEtuX/9JzXdYfSfEoAFRw/Mxe7Mh3RxfNg499S3U1fCoLiGXDzjePiOYK8JGUh7xNC55+aIyxk+qHzq14tb5PnOuPI4XHCSqyafsCcE2mtFM7pFOHYD3Cr6yP0jNc1Kmr34AIyspHGar7ucvwGUc7bYbLUiEFbaXnR8YgUmyj+2jl/dQUW5ykg9oDGA3ORqCCDCUC03tNc7u/ug gly3y+lR 0ZQmU1mYQxFQGL4wjUsk7QtuYGWEHfYOitQu+P5dLHG95i4kQV0uqr9rVBOnBUQtqhxm8MBvQbmHQx7PqdYQtkqgGtriL6jvl2aT/UgE67b4CjGjPt4bZM+M6Pm8/9gOASpLbedqW0afRbFXk+vcGfxFmX+cYV1lBqDfWcplcjAMlhh7iWH6AsWh77JmHaO49Il2p++x3RpQUcQxHVF+mr9MVKCPBWEuTPEmdnSVVHUL0W3SkVPyue2cLBOYrFN4OomNMra1rEiztFP9mfITJhSNCd5oRkdups3/v2s9nFAPYZkymM8FFsmG6NvP2DOS6xoaKtbvZdaGjnt04cF74vLGjbnydpYZso8gq+8d677fkYadkv+WLP0+dXwShuZpP1dKZfhATmpD75gunmAnFpdVZTG09obnVcnLuuz8qgH5XgHF2L4McpGsZU4k7bjl9E2zblCniFtK66Fi62J1/wCOPZg== 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: If freesize is less than dma_reserve, print warning message to report this case. Signed-off-by: Haifeng Xu --- mm/mm_init.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/mm/mm_init.c b/mm/mm_init.c index 232efac9a929..9a9d6a52471c 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -1561,9 +1561,14 @@ static void __init free_area_init_core(struct pglist_data *pgdat) } /* Account for reserved pages */ - if (j == 0 && freesize > dma_reserve) { - freesize -= dma_reserve; - pr_debug(" %s zone: %lu pages reserved\n", zone_names[0], dma_reserve); + if (j == 0) { + if (freesize >= dma_reserve) { + freesize -= dma_reserve; + pr_debug(" %s zone: %lu pages reserved\n", + zone_names[0], dma_reserve); + } else + pr_warn(" %s zone: %lu reserved pages exceeds freesize %lu\n", + zone_names[0], dma_reserve, freesize); } if (!is_highmem_idx(j))