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Wed, 05 Jun 2024 20:38:41 -0700 (PDT) MIME-Version: 1.0 References: <20240508202111.768b7a4d@yea> <20240515224524.1c8befbe@yea> <45fc081c-ee8d-4774-a597-708d2924f812@redhat.com> <87tti6pxxc.fsf@mail.lhotse> In-Reply-To: <87tti6pxxc.fsf@mail.lhotse> From: Yu Zhao Date: Wed, 5 Jun 2024 21:38:04 -0600 Message-ID: Subject: Re: kswapd0: page allocation failure: order:0, mode:0x820(GFP_ATOMIC), nodemask=(null),cpuset=/,mems_allowed=0 (Kernel v6.5.9, 32bit ppc) To: Michael Ellerman , Erhard Furtner Cc: David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Rspamd-Queue-Id: A2FD140002 X-Stat-Signature: 8x86k1jzzbtbmrkcb3zpu6436sttraum X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1717645123-941122 X-HE-Meta: U2FsdGVkX18geWW6juOv9srYmR1AVpEC1AxkJ0OyT3pZ956rBFdAfQbm+KUbVkJfqN73J8NMwZLQRvrwfvm+WjfXTR3+VVJuM1bJUs10lC8HP6kOjvd3RV6g7HPYg/ZF6tv0N5oFbAuU57fvZsVgZ0T/IvhGMkgZbQHAMCtbAk/qnPJbr/CQx7OG/UzCSWaqhqunv4R2Q/oP37u0tLmqLCWshlGN8Mz3EmFiKnHi3WeRhrzZx8w8vTduU/1nEVfdNYhoy8UZCYYcMhFU5eeiMyKVC3WNF4N0XkKWwBNyHMFjBnRV8yh8h4Pq/iOzuyF772t6VjR8YI5QvfYHxj1/4e3qKTxyymONIFu+H8DmWLSGi+Vhf4hl9kgcMafA94TnQVAbwDCnzPxH6Ccf0DY58Vra14GFCjYqdvBESVqGBSsMTzCvs3ILSybs/2+k0GHUiGTx8h/kYl1iGEG/3CKK3RvqHOVs/LiHZMfQNfhNJHYcX3ju8lGm55tf6lhNALSlUk0jd1H1OKN5kKPs2ivTJBkiH2cMmXDAowIz+W7LFQAIYTPPLdqkXPS8WSitJ1V9/TmVQpwNsbFV3FTNQ+DTY0L+4+MJ6c+CrbF2dGn1RaDSTFDMIiiK04xJ2X5PvnFo+4bhYMsJPMOEtykiaTqlhkZawbCqE9d7gdsx6Q9T5BXxrnSduOKuAPNDt5n+R/WqDTISroQHTgLbzF2zjjXXHjW/I+PGwLhns9CqjKAZq0EPmhyWokA1HBLBDAQiownzLm/IZDUOHRXtsC0wMw2IbyNuOP9w3pvkwyCTArWfuHIOWs/9ij2EoHgtufC+yiKsmVpqi5CzOSW7adf6waZb9D0ed/iNluJbgTyF1vqc+OXZa/VgxHsk2iX6kqIIzyZSZKiBPf5s5oyiQLb8jnJe9H50WmjVT0YhqRrcK2RXfMijzp0/geMHH5oKdl5GzC2eHUGDy/Ff8jNKoSBcnkF 6rZQYSy9 c3rreD3M5hyvBYBatLv287VwIyGVT3w5Yah852wOoscHYEMixarrWe/aD9gxy8S3sPojy2gBgSr4A8yhBeIOApdBYsNoEOGd+eaqX/0NdEmdxyMx/GUZJq2RLvi6nmbTSHUoYQzMb0EbzTceyvsePT78E6CVI353gnlXr4xXRW30dgS5QrhCL1EKuMmgFl5Ky5kBqF0Vben+hClxSWOjQl+drENdFOsCe2o+DlzX8qFSLb4xnpTNapGj8n3A7orrA4px+iFiHQM2Pmmf4tqdtSaViNDV4PCpSX5iwHp7enkj1Oetjar6+a6D/FKuZ4g1hiMx0 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 Wed, Jun 5, 2024 at 9:12=E2=80=AFPM Michael Ellerman wrote: > > David Hildenbrand writes: > > On 01.06.24 08:01, Yu Zhao wrote: > >> On Wed, May 15, 2024 at 4:06=E2=80=AFPM Yu Zhao wr= ote: > ... > >> > >> Your system has 2GB memory and it uses zswap with zsmalloc (which is > >> good since it can allocate from the highmem zone) and zstd/lzo (which > >> doesn't matter much). Somehow -- I couldn't figure out why -- it > >> splits the 2GB into a 0.25GB DMA zone and a 1.75GB highmem zone: > >> > >> [ 0.000000] Zone ranges: > >> [ 0.000000] DMA [mem 0x0000000000000000-0x000000002fffffff] > >> [ 0.000000] Normal empty > >> [ 0.000000] HighMem [mem 0x0000000030000000-0x000000007fffffff] > > > > That's really odd. But we are messing with "PowerMac3,6", so I don't > > really know what's right or wrong ... > > The DMA zone exists because 9739ab7eda45 ("powerpc: enable a 30-bit > ZONE_DMA for 32-bit pmac") selects it. > > It's 768MB (not 0.25GB) because it's clamped at max_low_pfn: Right. (I meant 0.75GB.) > #ifdef CONFIG_ZONE_DMA > max_zone_pfns[ZONE_DMA] =3D min(max_low_pfn, > 1UL << (zone_dma_bits - PAGE_SHIFT)= ); > #endif > > Which comes eventually from CONFIG_LOWMEM_SIZE, which defaults to 768MB. I see. I grep'ed VMSPLIT which is used on x86 and arm but apparently not on powerpc. > I think it's 768MB because the user:kernel split is 3G:1G, and then the > kernel needs some of that 1G virtual space for vmalloc/ioremap/highmem, > so it splits it 768M:256M. > > Then ZONE_NORMAL is empty because it is also limited to max_low_pfn: > > max_zone_pfns[ZONE_NORMAL] =3D max_low_pfn; > > The rest of RAM is highmem. > > So I think that's all behaving as expected, but I don't know 32-bit / > highmem stuff that well so I could be wrong. Yes, the three zones work as intended. Erhard, Since your system only has 2GB memory, I'd try the 2G:2G split, which would in theory allow both the kernel and userspace to all memory. CONFIG_LOWMEM_SIZE_BOOL=3Dy CONFIG_LOWMEM_SIZE=3D0x7000000 (Michael, please correct me if the above wouldn't work.)