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Subject[PATCH] [RESEND] RFC: List per-process file descriptor consumption when hitting file-max
Date
From: Alexander Shishkin <alexander.shishckin@gmail.com>

[resending to aim at wider audience]
When a file descriptor limit is hit, it might be useful to see all the
users to be able to identify those that leak descriptors.

Signed-off-by: Alexander Shishkin <alexander.shishckin@gmail.com>
---
fs/file_table.c | 27 +++++++++++++++++++++++++++
1 files changed, 27 insertions(+), 0 deletions(-)

diff --git a/fs/file_table.c b/fs/file_table.c
index 54018fe..9e53167 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -136,8 +136,35 @@ struct file *get_empty_filp(void)
over:
/* Ran out of filps - report that */
if (get_nr_files() > old_max) {
+ struct task_struct *p;
+ struct files_struct *files;
+ struct fdtable *fdt;
+ int i, count = 0;
+
printk(KERN_INFO "VFS: file-max limit %d reached\n",
get_max_files());
+
+ read_lock(&tasklist_lock);
+ for_each_process(p) {
+ files = get_files_struct(p);
+ if (!files)
+ continue;
+
+ spin_lock(&files->file_lock);
+ fdt = files_fdtable(files);
+
+ /* we have to actually *count* the fds */
+ for (count = i = 0; i < fdt->max_fds; i++)
+ count += !!fcheck_files(files, i);
+
+ printk(KERN_INFO "=> %s [%d]: %d\n", p->comm,
+ p->pid, count);
+
+ spin_unlock(&files->file_lock);
+ put_files_struct(files);
+ }
+ read_unlock(&tasklist_lock);
+
old_max = get_nr_files();
}
goto fail;
--
1.6.1.3


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