[RFC PATCH 1/4] makedumpfile: Add flag to enable cyclic processing.

[Atsushi Kumagai]

Introduce -K option to enable cyclic processing. If -K option is specified,
then makedumpfile works cyclically and the memory usage will be constant.

Usage:
      # makedumpfile -K /proc/vmcore dumpfile

Signed-off-by: Atsushi Kumagai <kumagai-atsushi at mxc.nes.nec.co.jp>
---
 makedumpfile.c |    5 ++++-
 makedumpfile.h |    1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/makedumpfile.c b/makedumpfile.c
index d024e95..3e5f906 100644
--- a/makedumpfile.c
+++ b/makedumpfile.c
@@ -6968,7 +6968,7 @@ main(int argc, char *argv[])
 
 	info->block_order = DEFAULT_ORDER;
 	message_level = DEFAULT_MSG_LEVEL;
-	while ((opt = getopt_long(argc, argv, "b:cDd:EFfg:hi:lMRrsvXx:", longopts,
+	while ((opt = getopt_long(argc, argv, "b:cDd:EFfg:hi:KlMRrsvXx:", longopts,
 	    NULL)) != -1) {
 		switch (opt) {
 		case 'b':
@@ -7017,6 +7017,9 @@ main(int argc, char *argv[])
 				goto out;
 			info->flag_sadump_diskset = 1;
 			break;
+		case 'K':
+			info->flag_cyclic = TRUE;
+			break;
 		case 'l':
 			info->flag_compress = DUMP_DH_COMPRESSED_LZO;
 			break;
diff --git a/makedumpfile.h b/makedumpfile.h
index 6f5489d..c588e43 100644
--- a/makedumpfile.h
+++ b/makedumpfile.h
@@ -801,6 +801,7 @@ struct DumpInfo {
 	int		flag_rearrange;      /* flag of creating dumpfile from
 						flattened format */
 	int		flag_split;	     /* splitting vmcore */
+	int		flag_cyclic;	     /* cyclic processing to keep memory consumption */
 	int		flag_reassemble;     /* reassemble multiple dumpfiles into one */
 	int		flag_refiltering;    /* refilter from kdump-compressed file */
 	int		flag_force;	     /* overwrite existing stuff */
-- 
1.7.9.2