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67 lines
2.2 KiB
67 lines
2.2 KiB
From f63d8530b9b6a2d7e79b946e326e5a2197eb8f87 Mon Sep 17 00:00:00 2001 |
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From: Petr Tesarik <ptesarik@suse.com> |
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Date: Thu, 19 Jan 2017 18:37:09 +0100 |
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Subject: [PATCH] ppc64: Reduce number of ELF LOAD segments |
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The number of program header table entries (e_phnum) is an Elf64_Half, |
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which is a 16-bit entity, i.e. the limit is 65534 entries (one entry is |
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reserved for NOTE). This is a hard limit, defined by the ELF standard. |
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It is possible that more LMBs (Logical Memory Blocks) are needed to |
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represent all RAM on some machines, and this field overflows, causing |
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an incomplete /proc/vmcore file. |
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This has actually happened on a machine with 31TB of RAM and an LMB size |
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of 256MB. |
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However, since there is usually no memory hole between adjacent LMBs, the |
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map can be "compressed", combining multiple adjacent into a single LOAD |
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segment. |
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Signed-off-by: Petr Tesarik <ptesarik@suse.com> |
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Signed-off-by: Simon Horman <horms@verge.net.au> |
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Signed-off-by: Pingfan Liu <piliu@redhat.com> |
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--- |
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kexec/arch/ppc64/crashdump-ppc64.c | 12 +++++++++++- |
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1 file changed, 11 insertions(+), 1 deletion(-) |
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diff --git a/kexec/arch/ppc64/crashdump-ppc64.c b/kexec/arch/ppc64/crashdump-ppc64.c |
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index b3c8928..f62b159 100644 |
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--- a/kexec/arch/ppc64/crashdump-ppc64.c |
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+++ b/kexec/arch/ppc64/crashdump-ppc64.c |
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@@ -123,6 +123,7 @@ static void exclude_crash_region(uint64_t start, uint64_t end) |
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static int get_dyn_reconf_crash_memory_ranges(void) |
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{ |
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uint64_t start, end; |
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+ uint64_t startrange, endrange; |
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char fname[128], buf[32]; |
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FILE *file; |
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unsigned int i; |
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@@ -137,6 +138,7 @@ static int get_dyn_reconf_crash_memory_ranges(void) |
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} |
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fseek(file, 4, SEEK_SET); |
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+ startrange = endrange = 0; |
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for (i = 0; i < num_of_lmbs; i++) { |
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if ((n = fread(buf, 1, 24, file)) < 0) { |
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perror(fname); |
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@@ -162,8 +164,16 @@ static int get_dyn_reconf_crash_memory_ranges(void) |
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if ((flags & 0x80) || !(flags & 0x8)) |
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continue; |
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- exclude_crash_region(start, end); |
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+ if (start != endrange) { |
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+ if (startrange != endrange) |
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+ exclude_crash_region(startrange, endrange); |
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+ startrange = start; |
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+ } |
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+ endrange = end; |
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} |
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+ if (startrange != endrange) |
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+ exclude_crash_region(startrange, endrange); |
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+ |
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fclose(file); |
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return 0; |
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} |
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-- |
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2.7.4 |
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