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diskdump: Print total number of dumpable pages

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It's not clear how broken an incomplete dump from the existing debugging
prints. Aggregate number of valid pages helps to figure out approximate
size of the dump. Size of a complete dump is roughly:

  EXPECTED_CORE_SIZE = a few pages (kdump headers + bitmaps + descriptors) +
                       (total_valid_pages * block_size) * compression rate

An incomplete core would be significantly smaller than:

	total_valid_pages * block_size

Signed-off-by: Roman Bolshakov <r.bolshakov@yadro.com>
This commit is contained in:
Roman Bolshakov 2021-06-17 02:27:34 +03:00 committed by Kazuhito Hagio
parent 41cda195c6
commit 1425b0504b
1 changed files with 3 additions and 0 deletions
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3
diskdump.c
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@ -74,6 +74,7 @@ struct diskdump_data {
ulong evictions; /* total evictions done */
ulong cached_reads;
ulong *valid_pages;
int max_sect_len; /* highest bucket of valid_pages */
ulong accesses;
ulong snapshot_task;
};
@ -877,6 +878,7 @@ restart:
}
dd->valid_pages = calloc(sizeof(ulong), max_sect_len + 1);
dd->max_sect_len = max_sect_len;
for (i = 1; i < max_sect_len + 1; i++) {
dd->valid_pages[i] = dd->valid_pages[i - 1];
for (j = 0; j < BITMAP_SECT_LEN; j++, pfn++)
@ -2089,6 +2091,7 @@ __diskdump_memory_dump(FILE *fp)
else
fprintf(fp, "\n");
fprintf(fp, " valid_pages: %lx\n", (ulong)dd->valid_pages);
fprintf(fp, " total_valid_pages: %ld\n", dd->valid_pages[dd->max_sect_len]);
return 0;
}