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mm: simplify nodemask printing 

alloc_warn() and dump_header() have to explicitly handle NULL nodemask
which forces both paths to use pr_cont.  We can do better.  printk
already handles NULL pointers properly so all we need is to teach
nodemask_pr_args to handle NULL nodemask carefully.  This allows
simplification of both alloc_warn() and dump_header() and gets rid of
pr_cont altogether.

This patch has been motivated by patch from Joe Perches

  http://lkml.kernel.org/r/b31236dfe3fc924054fd7842bde678e71d193638.1509991345.git.joe@perches.com

[akpm@linux-foundation.org: fix tile warning, per Arnd]
Link: http://lkml.kernel.org/r/20171109100531.3cn2hcqnuj7mjaju@dhcp22.suse.cz
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Joe Perches <joe@perches.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michal Hocko 2017-11-15 17:39:14 -08:00 committed by Linus Torvalds
parent c50842c8e1
commit 0205f75571
3 changed files with 10 additions and 18 deletions
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4
include/linux/nodemask.h
View File

@ -104,7 +104,9 @@ extern nodemask_t _unused_nodemask_arg_;
*
* Can be used to provide arguments for '%*pb[l]' when printing a nodemask.
*/
#define nodemask_pr_args(maskp) MAX_NUMNODES, (maskp)->bits
#define nodemask_pr_args(maskp) \
((maskp) != NULL) ? MAX_NUMNODES : 0, \
((maskp) != NULL) ? (maskp)->bits : NULL
/*
* The inline keyword gives the compiler room to decide to inline, or

12
mm/oom_kill.c
View File

@ -426,14 +426,10 @@ static void dump_tasks(struct mem_cgroup *memcg, const nodemask_t *nodemask)
static void dump_header(struct oom_control *oc, struct task_struct *p)
{
pr_warn("%s invoked oom-killer: gfp_mask=%#x(%pGg), nodemask=",
current->comm, oc->gfp_mask, &oc->gfp_mask);
if (oc->nodemask)
pr_cont("%*pbl", nodemask_pr_args(oc->nodemask));
else
pr_cont("(null)");
pr_cont(", order=%d, oom_score_adj=%hd\n",
oc->order, current->signal->oom_score_adj);
pr_warn("%s invoked oom-killer: gfp_mask=%#x(%pGg), nodemask=%*pbl, order=%d, oom_score_adj=%hd\n",
current->comm, oc->gfp_mask, &oc->gfp_mask,
nodemask_pr_args(oc->nodemask), oc->order,
current->signal->oom_score_adj);
if (!IS_ENABLED(CONFIG_COMPACTION) && oc->order)
pr_warn("COMPACTION is disabled!!!\n");

12
mm/page_alloc.c
View File

@ -3279,20 +3279,14 @@ void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...)
if ((gfp_mask & __GFP_NOWARN) || !__ratelimit(&nopage_rs))
return;
pr_warn("%s: ", current->comm);
va_start(args, fmt);
vaf.fmt = fmt;
vaf.va = &args;
pr_cont("%pV", &vaf);
pr_warn("%s: %pV, mode:%#x(%pGg), nodemask=%*pbl\n",
current->comm, &vaf, gfp_mask, &gfp_mask,
nodemask_pr_args(nodemask));
va_end(args);
pr_cont(", mode:%#x(%pGg), nodemask=", gfp_mask, &gfp_mask);
if (nodemask)
pr_cont("%*pbl\n", nodemask_pr_args(nodemask));
else
pr_cont("(null)\n");
cpuset_print_current_mems_allowed();
dump_stack();