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Subject[PATCH V2 2/6] Add /proc/<pid>/numa_vamaps file for numa node information
Date
Introduce supporting data structures and file operations. Later
patch will provide changes for generating file content.

Signed-off-by: Prakash Sangappa <prakash.sangappa@oracle.com>
Reviewed-by: Steve Sistare <steven.sistare@oracle.com>
---
fs/proc/base.c | 2 ++
fs/proc/internal.h | 1 +
fs/proc/task_mmu.c | 42 ++++++++++++++++++++++++++++++++++++++++++
3 files changed, 45 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index ccf86f1..1af99ae 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2927,6 +2927,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("maps", S_IRUGO, proc_pid_maps_operations),
#ifdef CONFIG_NUMA
REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
+ REG("numa_vamaps", S_IRUGO, proc_numa_vamaps_operations),
#endif
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
LNK("cwd", proc_cwd_link),
@@ -3313,6 +3314,7 @@ static const struct pid_entry tid_base_stuff[] = {
#endif
#ifdef CONFIG_NUMA
REG("numa_maps", S_IRUGO, proc_pid_numa_maps_operations),
+ REG("numa_vamaps", S_IRUGO, proc_numa_vamaps_operations),
#endif
REG("mem", S_IRUSR|S_IWUSR, proc_mem_operations),
LNK("cwd", proc_cwd_link),
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 5185d7f..994c7fd 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -298,6 +298,7 @@ extern const struct file_operations proc_pid_smaps_operations;
extern const struct file_operations proc_pid_smaps_rollup_operations;
extern const struct file_operations proc_clear_refs_operations;
extern const struct file_operations proc_pagemap_operations;
+extern const struct file_operations proc_numa_vamaps_operations;

extern unsigned long task_vsize(struct mm_struct *);
extern unsigned long task_statm(struct mm_struct *,
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 0e2095c..02b553c 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -1583,6 +1583,16 @@ struct numa_maps_private {
struct numa_maps md;
};

+#define NUMA_VAMAPS_BUFSZ 1024
+struct numa_vamaps_private {
+ struct mm_struct *mm;
+ struct numa_maps md;
+ u64 vm_start;
+ size_t from;
+ size_t count; /* residual bytes in buf at offset 'from' */
+ char buf[NUMA_VAMAPS_BUFSZ]; /* buffer */
+};
+
static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty,
unsigned long nr_pages)
{
@@ -1848,6 +1858,34 @@ static int pid_numa_maps_open(struct inode *inode, struct file *file)
sizeof(struct numa_maps_private));
}

+static int numa_vamaps_open(struct inode *inode, struct file *file)
+{
+ struct mm_struct *mm;
+ struct numa_vamaps_private *nvm;
+ nvm = kzalloc(sizeof(struct numa_vamaps_private), GFP_KERNEL);
+ if (!nvm)
+ return -ENOMEM;
+
+ mm = proc_mem_open(inode, PTRACE_MODE_READ);
+ if (IS_ERR(mm)) {
+ kfree(nvm);
+ return PTR_ERR(mm);
+ }
+ nvm->mm = mm;
+ file->private_data = nvm;
+ return 0;
+}
+
+static int numa_vamaps_release(struct inode *inode, struct file *file)
+{
+ struct numa_vamaps_private *nvm = file->private_data;
+
+ if (nvm->mm)
+ mmdrop(nvm->mm);
+ kfree(nvm);
+ return 0;
+}
+
const struct file_operations proc_pid_numa_maps_operations = {
.open = pid_numa_maps_open,
.read = seq_read,
@@ -1855,4 +1893,8 @@ const struct file_operations proc_pid_numa_maps_operations = {
.release = proc_map_release,
};

+const struct file_operations proc_numa_vamaps_operations = {
+ .open = numa_vamaps_open,
+ .release = numa_vamaps_release,
+};
#endif /* CONFIG_NUMA */
--
2.7.4
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