/*
+ * lttng-statedump.c
+ *
* Linux Trace Toolkit Next Generation Kernel State Dump
*
* Copyright 2005 Jean-Hugues Deschenes <jean-hugues.deschenes@polymtl.ca>
* Copyright 2006-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; only
+ * version 2.1 of the License.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ *
* Changes:
* Eric Clement: Add listing of network IP interface
* 2006, 2007 Mathieu Desnoyers Fix kernel threads
* Various updates
- *
- * Dual LGPL v2.1/GPL v2 license.
*/
#include <linux/init.h>
#include "lttng-events.h"
#include "wrapper/irqdesc.h"
+#include "wrapper/spinlock.h"
+#include "wrapper/fdtable.h"
#ifdef CONFIG_GENERIC_HARDIRQS
#include <linux/irq.h>
#define TRACE_INCLUDE_FILE lttng-statedump
#include "instrumentation/events/lttng-module/lttng-statedump.h"
+struct lttng_fd_ctx {
+ char *page;
+ struct lttng_session *session;
+ struct task_struct *p;
+};
+
/*
* Protected by the trace lock.
*/
}
#endif /* CONFIG_INET */
+static
+int lttng_dump_one_fd(const void *p, struct file *file, unsigned int fd)
+{
+ const struct lttng_fd_ctx *ctx = p;
+ const char *s = d_path(&file->f_path, ctx->page, PAGE_SIZE);
+
+ if (IS_ERR(s)) {
+ struct dentry *dentry = file->f_path.dentry;
+
+ /* Make sure we give at least some info */
+ spin_lock(&dentry->d_lock);
+ trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd,
+ dentry->d_name.name);
+ spin_unlock(&dentry->d_lock);
+ goto end;
+ }
+ trace_lttng_statedump_file_descriptor(ctx->session, ctx->p, fd, s);
+end:
+ return 0;
+}
static
void lttng_enumerate_task_fd(struct lttng_session *session,
struct task_struct *p, char *tmp)
{
- struct fdtable *fdt;
- struct file *filp;
- unsigned int i;
- const unsigned char *path;
+ struct lttng_fd_ctx ctx = { .page = tmp, .session = session, .p = p };
task_lock(p);
- if (!p->files)
- goto unlock_task;
- spin_lock(&p->files->file_lock);
- fdt = files_fdtable(p->files);
- for (i = 0; i < fdt->max_fds; i++) {
- filp = fcheck_files(p->files, i);
- if (!filp)
- continue;
- path = d_path(&filp->f_path, tmp, PAGE_SIZE);
- /* Make sure we give at least some info */
- trace_lttng_statedump_file_descriptor(session, p, i,
- IS_ERR(path) ?
- filp->f_dentry->d_name.name :
- path);
- }
- spin_unlock(&p->files->file_lock);
-unlock_task:
+ lttng_iterate_fd(p->files, 0, lttng_dump_one_fd, &ctx);
task_unlock(p);
}
return 0;
}
+#if 0
+/*
+ * FIXME: we cannot take a mmap_sem while in a RCU read-side critical section
+ * (scheduling in atomic). Normally, the tasklist lock protects this kind of
+ * iteration, but it is not exported to modules.
+ */
static
void lttng_enumerate_task_vm_maps(struct lttng_session *session,
struct task_struct *p)
rcu_read_unlock();
return 0;
}
+#endif
#ifdef CONFIG_GENERIC_HARDIRQS
irq_desc_get_chip(desc)->name ? : "unnamed_irq_chip";
local_irq_save(flags);
- raw_spin_lock(&desc->lock);
+ wrapper_desc_spin_lock(&desc->lock);
for (action = desc->action; action; action = action->next) {
trace_lttng_statedump_interrupt(session,
irq, irq_chip_name, action);
}
- raw_spin_unlock(&desc->lock);
+ wrapper_desc_spin_unlock(&desc->lock);
local_irq_restore(flags);
}
#undef irq_to_desc
}
#endif
+static
+void lttng_statedump_process_ns(struct lttng_session *session,
+ struct task_struct *p,
+ enum lttng_thread_type type,
+ enum lttng_execution_mode mode,
+ enum lttng_execution_submode submode,
+ enum lttng_process_status status)
+{
+ struct nsproxy *proxy;
+ struct pid_namespace *pid_ns;
+
+ rcu_read_lock();
+ proxy = task_nsproxy(p);
+ if (proxy) {
+ pid_ns = proxy->pid_ns;
+ do {
+ trace_lttng_statedump_process_state(session,
+ p, type, mode, submode, status, pid_ns);
+ pid_ns = pid_ns->parent;
+ } while (pid_ns);
+ } else {
+ trace_lttng_statedump_process_state(session,
+ p, type, mode, submode, status, NULL);
+ }
+ rcu_read_unlock();
+}
+
static
int lttng_enumerate_process_states(struct lttng_session *session)
{
type = LTTNG_USER_THREAD;
else
type = LTTNG_KERNEL_THREAD;
- trace_lttng_statedump_process_state(session,
+ lttng_statedump_process_ns(session,
p, type, mode, submode, status);
task_unlock(p);
} while_each_thread(g, p);
trace_lttng_statedump_start(session);
lttng_enumerate_process_states(session);
lttng_enumerate_file_descriptors(session);
- lttng_enumerate_vm_maps(session);
+ /* FIXME lttng_enumerate_vm_maps(session); */
lttng_list_interrupts(session);
lttng_enumerate_network_ip_interface(session);
schedule_delayed_work_on(cpu, &cpu_work[cpu], 0);
}
/* Wait for all threads to run */
- __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) != 0));
+ __wait_event(statedump_wq, (atomic_read(&kernel_threads_to_run) == 0));
put_online_cpus();
/* Our work is done */
printk(KERN_DEBUG "LTT state dump end\n");
projects / lttng-modules.git / blobdiff