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mm: rework of dumping shared memory

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vma_entry contains shmid and all shared memory are dumped in own files.
The most interesting thing is restore.
A maping is restored by process with the smallest pid. The mamping
is created before executing restorer.
We map a full mapping and restore it's conten, then we open a file from
/proc/pid/map_files and store a descriptor in vma_info. The mapping is
unmaped. Now we can map any region of this mapping in the restorer.

We use this trick, because a target process may have this mapping in
some places and the restorer has not function to open proc files.

v2: fix error hangling
xemul: Fixed static-s and args for cr_dump_shmem

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2012-03-21 10:12:00 +04:00
committed by Pavel Emelyanov
parent 31feef8ab4
commit e869c16df5
11 changed files with 308 additions and 267 deletions
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9
include/crtools.h
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@@ -21,10 +21,8 @@ enum {
CR_FD_FDINFO,
CR_FD_PAGES,
CR_FD_SHMEM_PAGES,
CR_FD_CORE,
CR_FD_PIPES,
CR_FD_SHMEM,
CR_FD_SIGACT,
CR_FD_UNIXSK,
CR_FD_INETSK,
@@ -46,6 +44,8 @@ enum {
CR_FD_PID_MAX, /* fmt, pid */
CR_FD_SHMEM_PAGES,
CR_FD_MAX
};
@@ -75,12 +75,11 @@ extern struct cr_fd_desc_tmpl fdset_template[CR_FD_MAX];
#define FMT_FNAME_FDINFO "fdinfo-%d.img"
#define FMT_FNAME_PAGES "pages-%d.img"
#define FMT_FNAME_SHMEM_PAGES "pages-shmem-%d.img"
#define FMT_FNAME_SHMEM_PAGES "pages-shmem-%ld.img"
#define FMT_FNAME_CORE "core-%d.img"
#define FMT_FNAME_CORE_OUT "core-%d.img.out"
#define FMT_FNAME_PIPES "pipes-%d.img"
#define FMT_FNAME_PSTREE "pstree-%d.img"
#define FMT_FNAME_SHMEM "shmem-%d.img"
#define FMT_FNAME_SIGACTS "sigacts-%d.img"
#define FMT_FNAME_UNIXSK "unixsk-%d.img"
#define FMT_FNAME_INETSK "inetsk-%d.img"
@@ -119,10 +118,8 @@ struct cr_fdset {
#define CR_FD_DESC_TASK (\
CR_FD_DESC_USE(CR_FD_FDINFO) |\
CR_FD_DESC_USE(CR_FD_PAGES) |\
CR_FD_DESC_USE(CR_FD_SHMEM_PAGES) |\
CR_FD_DESC_USE(CR_FD_CORE) |\
CR_FD_DESC_USE(CR_FD_PIPES) |\
CR_FD_DESC_USE(CR_FD_SHMEM) |\
CR_FD_DESC_USE(CR_FD_SIGACT) |\
CR_FD_DESC_USE(CR_FD_UNIXSK) |\
CR_FD_DESC_USE(CR_FD_INETSK) |\