[PATCH v2] makedumpfile: add parameters to update_cyclic_region

[Baoquan He]

Function update_cyclic_region has a name which doesn't match its
functionality. it does 3 tings: update the cyclic region; if elf
dump, call create_1st_bitmap_cyclic in this region; call
exclude_unnecessary_pages_cyclic to exclude pages in this region.

However not all 3 things are needed to be done everywhere. Somewhere
unnecessary thing is done with much efforts, e.g when get dumpable
page numbers for elf cyclic dump 1st bigmap creating is not needed.
Somewhere thing is done, but it also cause errors, e.g when write
1st bitmap cyclic for compressed kdump it will add free page numbers
twice, namely pfn_free is doubled. Then dump information will be wrong
like below:

Original pages  : 0x000000000007539c
  Excluded pages   : 0x00000000000d986a
    Pages filled with zero  : 0x0000000000001196
    Cache pages             : 0x0000000000025008
    Cache pages + private   : 0x0000000000004baa
    User process data pages : 0x00000000000127d0
    Free pages              : 0x000000000009c352
    Hwpoison pages          : 0x0000000000000000
  Remaining pages  : 0xfffffffffff9bb32
  (The number of pages is reduced to 38418230895101%.)
Memory Hole     : 0x000000000000ac62
--------------------------------------------------
Total pages     : 0x000000000007fffe

So add 2 more parameters for update_cyclic_region. By these adding
update_cyclic_region can be called in a refined grain. Then effort
can be saved and above error can be fixed.

And in kdump compressed dump case, prepare_bitmap2_buffer_cyclic is
called, that means partial_bitmap2 is malloced twice. Here remove
the 2nd call.
---
 makedumpfile.c | 21 +++++++++------------
 1 file changed, 9 insertions(+), 12 deletions(-)

diff --git a/makedumpfile.c b/makedumpfile.c
index 3746cf6..8cfc2a5 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -4725,7 +4725,7 @@ exclude_unnecessary_pages_cyclic(void)
 }
 
 int
-update_cyclic_region(unsigned long long pfn)
+update_cyclic_region(unsigned long long pfn, int bmp1_set, int exclude)
 {
 	if (is_cyclic_region(pfn))
 		return TRUE;
@@ -4736,10 +4736,10 @@ update_cyclic_region(unsigned long long pfn)
 	if (info->cyclic_end_pfn > info->max_mapnr)
 		info->cyclic_end_pfn = info->max_mapnr;
 
-	if (info->flag_elf_dumpfile && !create_1st_bitmap_cyclic())
+	if (bmp1_set && info->flag_elf_dumpfile && !create_1st_bitmap_cyclic())
 		return FALSE;
 
-	if (!exclude_unnecessary_pages_cyclic())
+	if (exclude && !exclude_unnecessary_pages_cyclic())
 		return FALSE;
 
 	return TRUE;
@@ -5502,7 +5502,7 @@ get_num_dumpable_cyclic(void)
 	unsigned long long pfn, num_dumpable=0;
 
 	for (pfn = 0; pfn < info->max_mapnr; pfn++) {
-		if (!update_cyclic_region(pfn))
+		if (!update_cyclic_region(pfn, 0, 1))
 			return FALSE;
 
 		if (is_dumpable_cyclic(info->partial_bitmap2, pfn))
@@ -5803,7 +5803,7 @@ get_loads_dumpfile_cyclic(void)
 			 * Update target region and bitmap
 			 */
 			if (!is_cyclic_region(pfn)) {
-				if (!update_cyclic_region(pfn))
+				if (!update_cyclic_region(pfn, 0, 1))
 					return FALSE;
 			}
 
@@ -5872,7 +5872,7 @@ write_elf_pages_cyclic(struct cache_data *cd_header, struct cache_data *cd_page)
 
 	info->cyclic_start_pfn = 0;
 	info->cyclic_end_pfn = 0;
-	if (!update_cyclic_region(0))
+	if (!update_cyclic_region(0, 1, 1))
 		return FALSE;
 
 	if (!(phnum = get_phnum_memory()))
@@ -5910,7 +5910,7 @@ write_elf_pages_cyclic(struct cache_data *cd_header, struct cache_data *cd_page)
 			/*
 			 * Update target region and partial bitmap if necessary.
 			 */
-			if (!update_cyclic_region(pfn))
+			if (!update_cyclic_region(pfn, 1, 1))
 				return FALSE;
 
 			if (!is_dumpable_cyclic(info->partial_bitmap2, pfn)) {
@@ -6805,7 +6805,7 @@ write_kdump_pages_and_bitmap_cyclic(struct cache_data *cd_header, struct cache_d
 	for (pfn = 0; pfn < info->max_mapnr; pfn++) {
 		if (is_cyclic_region(pfn))
 			continue;
-		if (!update_cyclic_region(pfn))
+		if (!update_cyclic_region(pfn, 0, 0))
 			return FALSE;
 		if (!create_1st_bitmap_cyclic())
 			return FALSE;
@@ -6815,9 +6815,6 @@ write_kdump_pages_and_bitmap_cyclic(struct cache_data *cd_header, struct cache_d
 
 	free_bitmap1_buffer();
 
-	if (!prepare_bitmap2_buffer_cyclic())
-		return FALSE;
-
 	/*
 	 * Write pages and bitmap cyclically.
 	 */
@@ -6827,7 +6824,7 @@ write_kdump_pages_and_bitmap_cyclic(struct cache_data *cd_header, struct cache_d
 		if (is_cyclic_region(pfn))
 			continue;
 
-		if (!update_cyclic_region(pfn))
+		if (!update_cyclic_region(pfn, 0, 1))
                         return FALSE;
 
 		if (!write_kdump_pages_cyclic(cd_header, cd_page, &pd_zero, &offset_data))
-- 
1.8.3.1