Linux-mm Archive on lore.kernel.org
 help / color / Atom feed
From: Mina Almasry <almasrymina@google.com>
Cc: Mina Almasry <almasrymina@google.com>,
	David Rientjes <rientjes@google.com>,
	 Mike Kravetz <mike.kravetz@oracle.com>,
	Shakeel Butt <shakeelb@google.com>,
	 Andrew Morton <akpm@linux-foundation.org>,
	linux-mm@kvack.org,  linux-kernel@vger.kernel.org
Subject: [PATCH] hugetlb: Remove check_coalesce_bug debug code
Date: Wed, 19 Feb 2020 15:36:10 -0800
Message-ID: <20200219233610.13808-1-almasrymina@google.com> (raw)
In-Reply-To: <cb402ae6-8424-c1f7-35ff-6acc68f9a23b@oracle.com>

Commit b5f16a533ce8a ("hugetlb: support file_region coalescing
again") made changes to the resv_map code which are hard to test, it
so added debug code guarded by CONFIG_DEBUG_VM which conducts an
expensive operation that loops over the resv_map and checks it for
errors.

Unfortunately, some distros have CONFIG_DEBUG_VM on in their default
kernels, and we don't want this debug code behind CONFIG_DEBUG_VM
and called each time a file region is added. This patch removes this
debug code. I may look into making it a test or leave it for my local
testing.

Signed-off-by: Mina Almasry <almasrymina@google.com>

Cc: David Rientjes <rientjes@google.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org

Fixes: b5f16a533ce8a ("hugetlb: support file_region coalescing again")

---
 mm/hugetlb.c | 43 -------------------------------------------
 1 file changed, 43 deletions(-)

diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index 94e27dfec0435..3febbbda3dc2b 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -289,48 +289,6 @@ static bool has_same_uncharge_info(struct file_region *rg,
 #endif
 }

-#if defined(CONFIG_DEBUG_VM) && defined(CONFIG_CGROUP_HUGETLB)
-static void dump_resv_map(struct resv_map *resv)
-{
-	struct list_head *head = &resv->regions;
-	struct file_region *rg = NULL;
-
-	pr_err("--------- start print resv_map ---------\n");
-	list_for_each_entry(rg, head, link) {
-		pr_err("rg->from=%ld, rg->to=%ld, rg->reservation_counter=%px, rg->css=%px\n",
-		       rg->from, rg->to, rg->reservation_counter, rg->css);
-	}
-	pr_err("--------- end print resv_map ---------\n");
-}
-
-/* Debug function to loop over the resv_map and make sure that coalescing is
- * working.
- */
-static void check_coalesce_bug(struct resv_map *resv)
-{
-	struct list_head *head = &resv->regions;
-	struct file_region *rg = NULL, *nrg = NULL;
-
-	list_for_each_entry(rg, head, link) {
-		nrg = list_next_entry(rg, link);
-
-		if (&nrg->link == head)
-			break;
-
-		if (nrg->reservation_counter && nrg->from == rg->to &&
-		    nrg->reservation_counter == rg->reservation_counter &&
-		    nrg->css == rg->css) {
-			dump_resv_map(resv);
-			VM_BUG_ON(true);
-		}
-	}
-}
-#else
-static void check_coalesce_bug(struct resv_map *resv)
-{
-}
-#endif
-
 static void coalesce_file_region(struct resv_map *resv, struct file_region *rg)
 {
 	struct file_region *nrg = NULL, *prg = NULL;
@@ -435,7 +393,6 @@ static long add_reservation_in_range(struct resv_map *resv, long f, long t,
 	}

 	VM_BUG_ON(add < 0);
-	check_coalesce_bug(resv);
 	return add;
 }

--
2.25.0.265.gbab2e86ba0-goog


  parent reply index

Thread overview: 42+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-11 21:31 [PATCH v12 1/9] hugetlb_cgroup: Add hugetlb_cgroup reservation counter Mina Almasry
2020-02-11 21:31 ` [PATCH v12 2/9] hugetlb_cgroup: add interface for charge/uncharge hugetlb reservations Mina Almasry
2020-02-15  0:50   ` Mike Kravetz
2020-02-16  1:21     ` David Rientjes
2020-02-11 21:31 ` [PATCH v12 3/9] hugetlb_cgroup: add reservation accounting for private mappings Mina Almasry
2020-02-11 21:31 ` [PATCH v12 4/9] hugetlb: disable region_add file_region coalescing Mina Almasry
2020-02-15  1:27   ` Mike Kravetz
2020-02-16  1:25   ` David Rientjes
2020-02-11 21:31 ` [PATCH v12 5/9] hugetlb_cgroup: add accounting for shared mappings Mina Almasry
2020-02-16  1:29   ` David Rientjes
2020-02-18 18:07   ` Mike Kravetz
2020-02-11 21:31 ` [PATCH v12 6/9] hugetlb_cgroup: support noreserve mappings Mina Almasry
2020-02-18 20:57   ` Mike Kravetz
2020-02-11 21:31 ` [PATCH v12 7/9] hugetlb: support file_region coalescing again Mina Almasry
2020-02-16  1:29   ` David Rientjes
2020-02-19  3:28   ` Mike Kravetz
2020-02-19  7:54     ` Mina Almasry
2020-02-19 23:36     ` Mina Almasry [this message]
2020-02-20  0:07       ` [PATCH] hugetlb: Remove check_coalesce_bug debug code Mike Kravetz
2020-02-11 21:31 ` [PATCH v12 8/9] hugetlb_cgroup: Add hugetlb_cgroup reservation tests Mina Almasry
2020-02-12  8:50   ` Sandipan Das
2020-02-20  0:05     ` Mina Almasry
2020-02-21  0:52   ` Mike Kravetz
2020-02-11 21:31 ` [PATCH v12 9/9] hugetlb_cgroup: Add hugetlb_cgroup reservation docs Mina Almasry
2020-02-20  0:03   ` Mina Almasry
2020-02-20  0:18   ` Mike Kravetz
2020-02-11 23:19 ` [PATCH v12 1/9] hugetlb_cgroup: Add hugetlb_cgroup reservation counter Andrew Morton
2020-02-18 14:21   ` Qian Cai
2020-02-18 18:35     ` Mina Almasry
2020-02-18 18:41       ` Qian Cai
2020-02-18 19:14       ` Mike Kravetz
2020-02-18 19:25         ` Mina Almasry
2020-02-18 21:36           ` Mina Almasry
2020-02-18 21:41             ` Mike Kravetz
2020-02-18 22:27               ` Mina Almasry
2020-02-19 19:05   ` Mina Almasry
2020-02-19 21:06     ` Andrew Morton
2020-02-20 19:22       ` Mina Almasry
2020-02-21  0:28         ` Andrew Morton
2020-02-21  0:41           ` Mike Kravetz
2020-02-21  1:52             ` Mina Almasry
2020-02-21 20:19       ` Mina Almasry

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200219233610.13808-1-almasrymina@google.com \
    --to=almasrymina@google.com \
    --cc=akpm@linux-foundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=mike.kravetz@oracle.com \
    --cc=rientjes@google.com \
    --cc=shakeelb@google.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-mm Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-mm/0 linux-mm/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-mm linux-mm/ https://lore.kernel.org/linux-mm \
		linux-mm@kvack.org
	public-inbox-index linux-mm

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kvack.linux-mm


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git