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parasite: execute only one parasite commend for dumping per-thread data

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We use two commands to get task registers safely. The first command
blocked signals, then crtools dumped registers and all per-thread data
and the the second command unblocks signals.

Currently signals can be blocked with help SETSIGMASK, so we need only
one command to dump per-thread data.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2013-07-11 13:46:54 +04:00 committed by Pavel Emelyanov
parent f68f37a11f
commit 45ed5c0ee5
3 changed files with 8 additions and 40 deletions
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4
include/parasite.h
View File

@ -24,7 +24,7 @@ enum {
PARASITE_CMD_ACK,
PARASITE_CMD_INIT,
PARASITE_CMD_INIT_THREAD,
PARASITE_CMD_DUMP_THREAD,
/*
* These two must be greater than INITs.
@ -34,7 +34,6 @@ enum {
PARASITE_CMD_CFG_LOG,
PARASITE_CMD_FINI,
PARASITE_CMD_FINI_THREAD,
PARASITE_CMD_MPROTECT_VMAS,
PARASITE_CMD_DUMPPAGES,
@ -164,7 +163,6 @@ struct parasite_dump_creds {
struct parasite_dump_thread {
unsigned int *tid_addr;
pid_t tid;
k_rtsigset_t blocked;
u32 tls;
stack_t sas;
};

14
parasite-syscall.c
View File

@ -506,7 +506,7 @@ int parasite_dump_thread_seized(struct parasite_ctl *ctl, int id,
return -1;
}
ret = parasite_execute_trap_by_pid(PARASITE_CMD_INIT_THREAD, ctl,
ret = parasite_execute_trap_by_pid(PARASITE_CMD_DUMP_THREAD, ctl,
pid, &regs_orig,
ctl->r_thread_stack,
(k_rtsigset_t *) &core->thread_core->blk_sigset);
@ -516,18 +516,10 @@ int parasite_dump_thread_seized(struct parasite_ctl *ctl, int id,
}
ret = get_task_regs(pid, regs_orig, core);
if (ret)
if (ret) {
pr_err("Can't obtain regs for thread %d\n", pid);
if (parasite_execute_trap_by_pid(PARASITE_CMD_FINI_THREAD, ctl,
pid, &regs_orig,
ctl->r_thread_stack,
(k_rtsigset_t *) &core->thread_core->blk_sigset)) {
pr_err("Can't init thread in parasite %d\n", pid);
return -1;
}
if (ret)
return -1;
BUG_ON(!core->thread_core->sas);
copy_sas(core->thread_core->sas, &args->sas);
@ -536,7 +528,7 @@ int parasite_dump_thread_seized(struct parasite_ctl *ctl, int id,
tid->virt = args->tid;
core_put_tls(core, args->tls);
return ret;
return 0;
}
int parasite_dump_sigacts_seized(struct parasite_ctl *ctl, struct cr_fdset *cr_fdset)

30
pie/parasite.c
View File

@ -203,41 +203,21 @@ static int drain_fds(struct parasite_drain_fd *args)
return ret;
}
static int init_thread(struct parasite_dump_thread *args)
static int dump_thread(struct parasite_dump_thread *args)
{
k_rtsigset_t to_block;
pid_t tid = sys_gettid();
int ret;
ksigfillset(&to_block);
ret = sys_sigprocmask(SIG_SETMASK, &to_block,
&args->blocked,
sizeof(k_rtsigset_t));
if (ret)
return -1;
ret = sys_prctl(PR_GET_TID_ADDRESS, (unsigned long) &args->tid_addr, 0, 0, 0);
if (ret)
goto err;
return ret;
args->tid = tid;
args->tls = arch_get_tls();
ret = sys_sigaltstack(NULL, &args->sas);
if (ret)
goto err;
return ret;
err:
sys_sigprocmask(SIG_SETMASK, &args->blocked,
NULL, sizeof(k_rtsigset_t));
return ret;
}
static int fini_thread(struct parasite_dump_thread *args)
{
return sys_sigprocmask(SIG_SETMASK, &args->blocked,
NULL, sizeof(k_rtsigset_t));
}
static int init(struct parasite_init_args *args)
@ -569,10 +549,8 @@ int __used parasite_service(unsigned int cmd, void *args)
switch (cmd) {
case PARASITE_CMD_INIT:
return init(args);
case PARASITE_CMD_INIT_THREAD:
return init_thread(args);
case PARASITE_CMD_FINI_THREAD:
return fini_thread(args);
case PARASITE_CMD_DUMP_THREAD:
return dump_thread(args);
case PARASITE_CMD_CFG_LOG:
return parasite_cfg_log(args);
case PARASITE_CMD_DAEMONIZE: