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From dc9ba08388bfb3aa28225d9cd5a4f779c10e23a9 Mon Sep 17 00:00:00 2001
From: anatasluo <luolongjuna@gmail.com>
Date: Sat, 26 Feb 2022 02:48:25 +0000
Subject: [PATCH 2/2] mm: add pin memory method for criu
Add pin memory for criu to improve memory recover
speed and avoid user private data saving to files.
Signed-off-by: anatasluo <luolongjuna@gmail.com>
---
criu/config.c | 1 +
criu/cr-restore.c | 5 ++
criu/crtools.c | 1 +
criu/include/cr_options.h | 1 +
criu/include/restorer.h | 28 ++++++++++++
criu/mem.c | 96 +++++++++++++++++++++++++++++++++++++++
criu/pie/restorer.c | 25 +++++++++-
criu/seize.c | 1 +
8 files changed, 157 insertions(+), 1 deletion(-)
diff --git a/criu/config.c b/criu/config.c
index 71f99c9..53a5cfd 100644
--- a/criu/config.c
+++ b/criu/config.c
@@ -696,6 +696,7 @@ int parse_options(int argc, char **argv, bool *usage_error, bool *has_exec_cmd,
{ "pre-dump-mode", required_argument, 0, 1097 },
{ "file-validation", required_argument, 0, 1098 },
BOOL_OPT("with-cpu-affinity", &opts.with_cpu_affinity),
+ BOOL_OPT("pin-memory", &opts.pin_memory),
{ "lsm-mount-context", required_argument, 0, 1099 },
{ "network-lock", required_argument, 0, 1100 },
{},
diff --git a/criu/cr-restore.c b/criu/cr-restore.c
index 5b645c1..6d6e63f 100644
--- a/criu/cr-restore.c
+++ b/criu/cr-restore.c
@@ -3805,6 +3805,11 @@ static int sigreturn_restore(pid_t pid, struct task_restore_args *task_args, uns
task_args, task_args->t->pid, task_args->nr_threads, task_args->clone_restore_fn,
task_args->thread_args);
+ if (opts.pin_memory)
+ task_args->pin_memory = true;
+ else
+ task_args->pin_memory = false;
+
/*
* An indirect call to task_restore, note it never returns
* and restoring core is extremely destructive.
diff --git a/criu/crtools.c b/criu/crtools.c
index b5a36b9..0cd4d11 100644
--- a/criu/crtools.c
+++ b/criu/crtools.c
@@ -447,6 +447,7 @@ usage:
" can be 'filesize' or 'buildid' (default).\n"
" --with-cpu-affinity Allow to restore cpu affinity. Only for hosts with\n"
" same cpu quantity.\n"
+ " --pin-memory Use pin memory method for checkpoint and restore.\n"
"\n"
"Check options:\n"
" Without options, \"criu check\" checks availability of absolutely required\n"
diff --git a/criu/include/cr_options.h b/criu/include/cr_options.h
index 3b50e59..61898fd 100644
--- a/criu/include/cr_options.h
+++ b/criu/include/cr_options.h
@@ -190,6 +190,7 @@ struct cr_options {
int file_validation_method;
/* restore cpu affinity */
int with_cpu_affinity;
+ int pin_memory;
};
extern struct cr_options opts;
diff --git a/criu/include/restorer.h b/criu/include/restorer.h
index c2ef8f0..c5dcf94 100644
--- a/criu/include/restorer.h
+++ b/criu/include/restorer.h
@@ -225,6 +225,7 @@ struct task_restore_args {
int lsm_type;
int child_subreaper;
bool has_clone3_set_tid;
+ bool pin_memory;
} __aligned(64);
/*
@@ -316,4 +317,31 @@ enum {
#define __r_sym(name) restorer_sym##name
#define restorer_sym(rblob, name) (void *)(rblob + __r_sym(name))
+#define PIN_MEM_FILE "/dev/pinmem"
+#define PIN_MEM_MAGIC 0x59
+#define _SET_PIN_MEM_AREA 1
+#define _CLEAR_PIN_MEM_AREA 2
+#define _REMAP_PIN_MEM_AREA 3
+#define _DUMP_SEPCIAL_PAGES 6
+#define _RETORE_SEPCIAL_PAGES 7
+#define SET_PIN_MEM_AREA _IOW(PIN_MEM_MAGIC, _SET_PIN_MEM_AREA, struct pin_mem_area_set)
+#define CLEAR_PIN_MEM_AREA _IOW(PIN_MEM_MAGIC, _CLEAR_PIN_MEM_AREA, int)
+#define REMAP_PIN_MEM_AREA _IOW(PIN_MEM_MAGIC, _REMAP_PIN_MEM_AREA, int)
+#define DUMP_SEPCIAL_PAGES _IOW(PIN_MEM_MAGIC, _DUMP_SEPCIAL_PAGES, int)
+#define RETORE_SEPCIAL_PAGES _IOW(PIN_MEM_MAGIC, _RETORE_SEPCIAL_PAGES, int)
+
+#define ONCE_PIN_MEM_SIZE_LIMIT 32 * 1024 * 1024
+#define MAX_PIN_MEM_AREA_NUM 16
+
+struct pin_mem_area {
+ unsigned long virt_start;
+ unsigned long virt_end;
+};
+
+struct pin_mem_area_set {
+ unsigned int pid;
+ unsigned int area_num;
+ struct pin_mem_area mem_area[MAX_PIN_MEM_AREA_NUM];
+};
+
#endif /* __CR_RESTORER_H__ */
diff --git a/criu/mem.c b/criu/mem.c
index ca74bfb..e95c8de 100644
--- a/criu/mem.c
+++ b/criu/mem.c
@@ -432,6 +432,85 @@ again:
return ret;
}
+bool should_pin_vmae(VmaEntry *vmae)
+{
+ /*
+ * vDSO area must be always dumped because on restore
+ * we might need to generate a proxy.
+ */
+ if (vma_entry_is(vmae, VMA_AREA_VDSO))
+ return false;
+ /*
+ * In turn VVAR area is special and referenced from
+ * vDSO area by IP addressing (at least on x86) thus
+ * never ever dump its content but always use one provided
+ * by the kernel on restore, ie runtime VVAR area must
+ * be remapped into proper place..
+ */
+ if (vma_entry_is(vmae, VMA_AREA_VVAR))
+ return false;
+
+ if (vma_entry_is(vmae, VMA_AREA_AIORING))
+ return false;
+ if (vma_entry_is(vmae, VMA_ANON_PRIVATE))
+ return true;
+
+ return false;
+}
+
+static int pin_one_pmas(int fd, unsigned long start,
+ unsigned long *pend, struct pstree_item *item)
+{
+ int ret;
+ unsigned int index = 0;
+ unsigned long end;
+ unsigned long next = start;
+ struct pin_mem_area_set pmas;
+ struct pin_mem_area *pma;
+
+ end = *pend;
+ while (start < end) {
+ next = (start + ONCE_PIN_MEM_SIZE_LIMIT > end) ? end : (start + ONCE_PIN_MEM_SIZE_LIMIT);
+ pma = &(pmas.mem_area[index]);
+ pma->virt_start = start;
+ pma->virt_end = next;
+ index++;
+ start += ONCE_PIN_MEM_SIZE_LIMIT;
+ if (index >= MAX_PIN_MEM_AREA_NUM)
+ break;
+ }
+ *pend = next;
+ pmas.area_num = index;
+ pmas.pid = vpid(item);
+ ret = ioctl(fd, SET_PIN_MEM_AREA, &pmas);
+ if (ret < 0)
+ pr_err("pin mem fail, errno: %s\n", strerror(errno));
+ return ret;
+}
+
+static int pin_vmae(VmaEntry *vmae, struct pstree_item *item)
+{
+ int fd;
+ int ret = 0;
+ unsigned long start, end;
+
+ fd = open(PIN_MEM_FILE, O_RDWR);
+ if (fd < 0) {
+ pr_err("open file: %s fail.\n", PIN_MEM_FILE);
+ return -1;
+ }
+ start = vmae->start;
+ while (start < vmae->end) {
+ end = vmae->end;
+ ret = pin_one_pmas(fd, start, &end, item);
+ if (ret < 0)
+ break;
+ start = end;
+ }
+ close(fd);
+ return ret;
+}
+
static int __parasite_dump_pages_seized(struct pstree_item *item, struct parasite_dump_pages_args *args,
struct vm_area_list *vma_area_list, struct mem_dump_ctl *mdc,
struct parasite_ctl *ctl)
@@ -500,6 +579,19 @@ static int __parasite_dump_pages_seized(struct pstree_item *item, struct parasit
goto out_xfer;
}
+ if (opts.pin_memory) {
+ /* pin memory before dump pages */
+ list_for_each_entry(vma_area, &vma_area_list->h, list) {
+ if (should_pin_vmae(vma_area->e)) {
+ ret = pin_vmae(vma_area->e, item);
+ if (ret) {
+ exit_code = -1;
+ goto out_xfer;
+ }
+ }
+ }
+ }
+
/*
* Step 1 -- generate the pagemap
*/
@@ -509,6 +601,10 @@ static int __parasite_dump_pages_seized(struct pstree_item *item, struct parasit
parent_predump_mode = mdc->parent_ie->pre_dump_mode;
list_for_each_entry(vma_area, &vma_area_list->h, list) {
+ if (opts.pin_memory && should_pin_vmae(vma_area->e)) {
+ continue;
+ }
+
ret = generate_vma_iovs(item, vma_area, pp, &xfer, args, ctl, &pmc, has_parent, mdc->pre_dump,
parent_predump_mode);
if (ret < 0)
diff --git a/criu/pie/restorer.c b/criu/pie/restorer.c
index fbc89fe..d04f8f1 100644
--- a/criu/pie/restorer.c
+++ b/criu/pie/restorer.c
@@ -1384,6 +1384,24 @@ int cleanup_current_inotify_events(struct task_restore_args *task_args)
return 0;
}
+int remap_vmas(int pid)
+{
+ int fd, ret = 0;
+
+ fd = sys_open(PIN_MEM_FILE, O_RDWR, 0);
+ if (fd == -1) {
+ pr_err("open file: %s fail.\n", PIN_MEM_FILE);
+ return -1;;
+ }
+
+ ret = sys_ioctl(fd, REMAP_PIN_MEM_AREA, (unsigned long) &pid);
+ if (ret < 0)
+ pr_err("remap pin mem fail for pid: %d\n", pid);
+ sys_close(fd);
+ return ret;
+}
+
+
/*
* The main routine to restore task via sigreturn.
* This one is very special, we never return there
@@ -1553,7 +1571,12 @@ long __export_restore_task(struct task_restore_args *args)
goto core_restore_end;
}
}
-
+ if (args->pin_memory) {
+ if (remap_vmas(my_pid) < 0) {
+ pr_err("Remap vmas fail\n");
+ goto core_restore_end;
+ }
+ }
/*
* Now read the contents (if any)
*/
diff --git a/criu/seize.c b/criu/seize.c
index 95bf9ef..c11ecab 100644
--- a/criu/seize.c
+++ b/criu/seize.c
@@ -23,6 +23,7 @@
#include "string.h"
#include "xmalloc.h"
#include "util.h"
+#include "mem.h"
#define NR_ATTEMPTS 5
--
2.25.1
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