File 0013-diskdump-Print-total-number-of-dumpable-pages.patch of Package crash.24895

From 1425b0504b1e79d88a2d188d7e4c0e7fceba4501 Mon Sep 17 00:00:00 2001
From: Roman Bolshakov <r.bolshakov@yadro.com>
Date: Thu, 17 Jun 2021 02:27:34 +0300
Subject: [PATCH] diskdump: Print total number of dumpable pages

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>
---
 diskdump.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/diskdump.c b/diskdump.c
index 59b79e1..0f94022 100644
--- a/diskdump.c
+++ b/diskdump.c
@@ -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;
 }
-- 
2.33.1