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 <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
