* [patch 071/158] mm/memory-failure.c clean up around tk pre-allocation
@ 2019-12-01 1:53 akpm
0 siblings, 0 replies; only message in thread
From: akpm @ 2019-12-01 1:53 UTC (permalink / raw)
To: akpm, dan.j.williams, jane.chu, linux-mm, mhocko, mm-commits,
n-horiguchi, torvalds
From: Jane Chu <jane.chu@oracle.com>
Subject: mm/memory-failure.c clean up around tk pre-allocation
add_to_kill() expects the first 'tk' to be pre-allocated, it makes
subsequent allocations on need basis, this makes the code a bit difficult
to read. Move all the allocation internal to add_to_kill() and drop the
**tk argument.
Link: http://lkml.kernel.org/r/1565112345-28754-2-git-send-email-jane.chu@oracle.com
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Michal Hocko <mhocko@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
mm/memory-failure.c | 40 +++++++++++++---------------------------
1 file changed, 13 insertions(+), 27 deletions(-)
--- a/mm/memory-failure.c~mm-memory-failurec-clean-up-around-tk-pre-allocation
+++ a/mm/memory-failure.c
@@ -303,25 +303,19 @@ static unsigned long dev_pagemap_mapping
/*
* Schedule a process for later kill.
* Uses GFP_ATOMIC allocations to avoid potential recursions in the VM.
- * TBD would GFP_NOIO be enough?
*/
static void add_to_kill(struct task_struct *tsk, struct page *p,
struct vm_area_struct *vma,
- struct list_head *to_kill,
- struct to_kill **tkc)
+ struct list_head *to_kill)
{
struct to_kill *tk;
- if (*tkc) {
- tk = *tkc;
- *tkc = NULL;
- } else {
- tk = kmalloc(sizeof(struct to_kill), GFP_ATOMIC);
- if (!tk) {
- pr_err("Memory failure: Out of memory while machine check handling\n");
- return;
- }
+ tk = kmalloc(sizeof(struct to_kill), GFP_ATOMIC);
+ if (!tk) {
+ pr_err("Memory failure: Out of memory while machine check handling\n");
+ return;
}
+
tk->addr = page_address_in_vma(p, vma);
if (is_zone_device_page(p))
tk->size_shift = dev_pagemap_mapping_shift(p, vma);
@@ -345,6 +339,7 @@ static void add_to_kill(struct task_stru
kfree(tk);
return;
}
+
get_task_struct(tsk);
tk->tsk = tsk;
list_add_tail(&tk->nd, to_kill);
@@ -436,7 +431,7 @@ static struct task_struct *task_early_ki
* Collect processes when the error hit an anonymous page.
*/
static void collect_procs_anon(struct page *page, struct list_head *to_kill,
- struct to_kill **tkc, int force_early)
+ int force_early)
{
struct vm_area_struct *vma;
struct task_struct *tsk;
@@ -461,7 +456,7 @@ static void collect_procs_anon(struct pa
if (!page_mapped_in_vma(page, vma))
continue;
if (vma->vm_mm == t->mm)
- add_to_kill(t, page, vma, to_kill, tkc);
+ add_to_kill(t, page, vma, to_kill);
}
}
read_unlock(&tasklist_lock);
@@ -472,7 +467,7 @@ static void collect_procs_anon(struct pa
* Collect processes when the error hit a file mapped page.
*/
static void collect_procs_file(struct page *page, struct list_head *to_kill,
- struct to_kill **tkc, int force_early)
+ int force_early)
{
struct vm_area_struct *vma;
struct task_struct *tsk;
@@ -496,7 +491,7 @@ static void collect_procs_file(struct pa
* to be informed of all such data corruptions.
*/
if (vma->vm_mm == t->mm)
- add_to_kill(t, page, vma, to_kill, tkc);
+ add_to_kill(t, page, vma, to_kill);
}
}
read_unlock(&tasklist_lock);
@@ -505,26 +500,17 @@ static void collect_procs_file(struct pa
/*
* Collect the processes who have the corrupted page mapped to kill.
- * This is done in two steps for locking reasons.
- * First preallocate one tokill structure outside the spin locks,
- * so that we can kill at least one process reasonably reliable.
*/
static void collect_procs(struct page *page, struct list_head *tokill,
int force_early)
{
- struct to_kill *tk;
-
if (!page->mapping)
return;
- tk = kmalloc(sizeof(struct to_kill), GFP_NOIO);
- if (!tk)
- return;
if (PageAnon(page))
- collect_procs_anon(page, tokill, &tk, force_early);
+ collect_procs_anon(page, tokill, force_early);
else
- collect_procs_file(page, tokill, &tk, force_early);
- kfree(tk);
+ collect_procs_file(page, tokill, force_early);
}
static const char *action_name[] = {
_
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2019-12-01 1:53 [patch 071/158] mm/memory-failure.c clean up around tk pre-allocation akpm
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