The patch titled
Subject: powerpc: implement arch_reserved_kernel_pages
has been added to the -mm tree. Its filename is
powerpc-implement-arch_reserved_kernel_pages.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/powerpc-implement-arch_reserved_kernel_pages.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/powerpc-implement-arch_reserved_kernel_pages.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Subject: powerpc: implement arch_reserved_kernel_pages
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:
[c00000000108fb10] [c0000000007fac88] dump_stack+0xb0/0xf0 (unreliable)
[c00000000108fb50] [c000000000235264] warn_alloc_failed+0x114/0x160
[c00000000108fbf0] [c000000000281484] __vmalloc_node_range+0x304/0x340
[c00000000108fca0] [c00000000028152c] __vmalloc+0x6c/0x90
[c00000000108fd40] [c000000000aecfb0]
alloc_large_system_hash+0x1b8/0x2c0
[c00000000108fe00] [c000000000af7240] inode_init+0x94/0xe4
[c00000000108fe80] [c000000000af6fec] vfs_caches_init+0x8c/0x13c
[c00000000108ff00] [c000000000ac4014] start_kernel+0x50c/0x578
[c00000000108ff90] [c000000000008c6c] start_here_common+0x20/0xa8
Link: http://lkml.kernel.org/r/1472476010-4709-4-git-send-email-srikar@xxxxxxxxxxxxxxxxxx
Signed-off-by: Srikar Dronamraju <srikar@xxxxxxxxxxxxxxxxxx>
Suggested-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Mahesh Salgaonkar <mahesh@xxxxxxxxxxxxxxxxxx>
Cc: Hari Bathini <hbathini@xxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/include/asm/mmzone.h | 3 +++
arch/powerpc/kernel/fadump.c | 5 +++++
2 files changed, 8 insertions(+)
diff -puN arch/powerpc/include/asm/mmzone.h~powerpc-implement-arch_reserved_kernel_pages arch/powerpc/include/asm/mmzone.h
--- a/arch/powerpc/include/asm/mmzone.h~powerpc-implement-arch_reserved_kernel_pages
+++ a/arch/powerpc/include/asm/mmzone.h
@@ -41,6 +41,9 @@ u64 memory_hotplug_max(void);
#else
#define memory_hotplug_max() memblock_end_of_DRAM()
#endif /* CONFIG_NEED_MULTIPLE_NODES */
+#ifdef CONFIG_FA_DUMP
+#define __HAVE_ARCH_RESERVED_KERNEL_PAGES
+#endif
#endif /* __KERNEL__ */
#endif /* _ASM_MMZONE_H_ */
diff -puN arch/powerpc/kernel/fadump.c~powerpc-implement-arch_reserved_kernel_pages arch/powerpc/kernel/fadump.c
--- a/arch/powerpc/kernel/fadump.c~powerpc-implement-arch_reserved_kernel_pages
+++ a/arch/powerpc/kernel/fadump.c
@@ -334,6 +334,11 @@ int __init fadump_reserve_mem(void)
return 1;
}
+unsigned long __init arch_reserved_kernel_pages(void)
+{
+ return memblock_reserved_size() / PAGE_SIZE;
+}
+
/* Look for fadump= cmdline option. */
static int __init early_fadump_param(char *p)
{
_
Patches currently in -mm which might be from srikar@xxxxxxxxxxxxxxxxxx are
mm-page_alloc-replace-set_dma_reserve-to-set_memory_reserve.patch
fadump-register-the-memory-reserved-by-fadump.patch
mm-introduce-arch_reserved_kernel_pages.patch
mm-memblock-expose-total-reserved-memory.patch
powerpc-implement-arch_reserved_kernel_pages.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
