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1e76609cc1
Currently significant amount of memory is reserved only in kernel booted to capture kernel dump using the fa_dump method. Kernels compiled with CONFIG_DEFERRED_STRUCT_PAGE_INIT will initialize only certain size memory per node. The certain size takes into account the dentry and inode cache sizes. Currently the cache sizes are calculated based on the total system memory including the reserved memory. However such a kernel when booting the same kernel as fadump kernel will not be able to allocate the required amount of memory to suffice for the dentry and inode caches. This results in crashes like Hence only implement arch_reserved_kernel_pages() for CONFIG_FA_DUMP configurations. The amount reserved will be reduced while calculating the large caches and will avoid crashes like the below on large systems such as 32 TB systems. Dentry cache hash table entries: 536870912 (order: 16, 4294967296 bytes) vmalloc: allocation failure, allocated 4097114112 of 17179934720 bytes swapper/0: page allocation failure: order:0, mode:0x2080020(GFP_ATOMIC) CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.6-master+ #3 Call Trace: dump_stack+0xb0/0xf0 (unreliable) warn_alloc_failed+0x114/0x160 __vmalloc_node_range+0x304/0x340 __vmalloc+0x6c/0x90 alloc_large_system_hash+0x1b8/0x2c0 inode_init+0x94/0xe4 vfs_caches_init+0x8c/0x13c start_kernel+0x50c/0x578 start_here_common+0x20/0xa8 Link: http://lkml.kernel.org/r/1472476010-4709-4-git-send-email-srikar@linux.vnet.ibm.com Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com> Suggested-by: Mel Gorman <mgorman@techsingularity.net> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com> Cc: Hari Bathini <hbathini@linux.vnet.ibm.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
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