If a task has many vma-s, the size of information about them can be too
big to be placed into one skb.
Signed-off-by: Andrey Vagin <avagin@xxxxxxxxxx>
---
include/uapi/linux/task_diag.h | 1 +
kernel/taskdiag.c | 17 +++++++++++++++++
2 files changed, 18 insertions(+)
diff --git a/include/uapi/linux/task_diag.h b/include/uapi/linux/task_diag.h
index e1d09e6..4a1cecb 100644
--- a/include/uapi/linux/task_diag.h
+++ b/include/uapi/linux/task_diag.h
@@ -151,6 +151,7 @@ static inline struct task_diag_vma_stat *task_diag_vma_stat(struct task_diag_vma
#define TASK_DIAG_DUMP_ALL 0
#define TASK_DIAG_DUMP_CHILDREN 1
#define TASK_DIAG_DUMP_THREAD 2
+#define TASK_DIAG_DUMP_ONE 3
struct task_diag_pid {
__u64 show_flags;
diff --git a/kernel/taskdiag.c b/kernel/taskdiag.c
index dc319bf..20494ee 100644
--- a/kernel/taskdiag.c
+++ b/kernel/taskdiag.c
@@ -559,6 +559,16 @@ static struct task_struct *iter_start(struct task_iter *iter)
}
switch (iter->req.dump_strategy) {
+ case TASK_DIAG_DUMP_ONE:
+ if (iter->parent == NULL)
+ return ERR_PTR(-ESRCH);
+ iter->pos = iter->cb->args[0];
+ if (iter->pos == 0) {
+ iter->task = iter->parent;
+ get_task_struct(iter->task);
+ } else
+ iter->task = NULL;
+ return iter->task;
case TASK_DIAG_DUMP_THREAD:
if (iter->parent == NULL)
return ERR_PTR(-ESRCH);
@@ -588,6 +598,13 @@ static struct task_struct *iter_start(struct task_iter *iter)
static struct task_struct *iter_next(struct task_iter *iter)
{
switch (iter->req.dump_strategy) {
+ case TASK_DIAG_DUMP_ONE:
+ iter->pos++;
+ iter->cb->args[0] = iter->pos;
+ if (iter->task)
+ put_task_struct(iter->task);
+ iter->task = NULL;
+ return NULL;
case TASK_DIAG_DUMP_THREAD:
iter->pos++;
iter->task = task_next_tid(iter->task);
--
2.1.0
--
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