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Fri, 25 Feb 2022 18:03:51 +0000 From: Vlastimil Babka To: David Rientjes , Christoph Lameter , Joonsoo Kim , Pekka Enberg , Roman Gushchin Cc: Andrew Morton , linux-mm@kvack.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, Oliver Glitta , Faiyaz Mohammed , Vlastimil Babka Subject: [PATCH 4/5] mm/slub: sort debugfs output by frequency of stack traces Date: Fri, 25 Feb 2022 19:03:17 +0100 Message-Id: <20220225180318.20594-5-vbabka@suse.cz> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220225180318.20594-1-vbabka@suse.cz> References: <20220225180318.20594-1-vbabka@suse.cz> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1524; i=vbabka@suse.cz; h=from:subject; bh=xon+abvw43ttzY/JL7dHk0VJGFJj42xBf676Lz8+8ko=; b=owEBbQGS/pANAwAIAeAhynPxiakQAcsmYgBiGRnkU4GtGDN+xfeUVAn46PwUBpP9RxYL6YJ8EmhE gxqahSmJATMEAAEIAB0WIQSNS5MBqTXjGL5IXszgIcpz8YmpEAUCYhkZ5AAKCRDgIcpz8YmpEPY8B/ 98BKdLhZDN6HhOVm0tL7NIdHDDDgyiOrkS6i3h+AjEpuQDeg3BCKLN9NiVU5UgDFE1CJk+1FbKNVLL aVYGQQQ0EELV2AclZOqeFxeCDEiRLqEP0miGwAhwYy4wiWvVveayeLFNdmmWSNVmwPo10g5PWSaT7b 8N2S/whmykcaLi9znc3uHNzPEHxN2ZCgPiKUa6g7ekYCz5rYPXOchAFB58HrbLbkB11dAykIq4uNFj L95uNYrhhWiu67zzKPR3qRWHazTSh/iDIySvg0iaAhFXvsD17ZQAiW6UxI0NM6qhGl/OUoivTiF4Hy sD/E+PWVRJzM+9k8nvTo0d+pnRJTXc X-Developer-Key: i=vbabka@suse.cz; a=openpgp; fpr=A940D434992C2E8E99103D50224FA7E7CC82A664 X-Rspamd-Queue-Id: 49071225A5 X-Stat-Signature: a68gx3fke7sgrqk4t51qurxfbbdgn448 X-Rspam-User: Authentication-Results: imf03.hostedemail.com; dkim=pass header.d=suse.cz header.s=susede2_rsa header.b=YGjh6vBj; dkim=pass header.d=suse.cz header.s=susede2_ed25519 header.b="l6p/u75O"; spf=pass (imf03.hostedemail.com: domain of vbabka@suse.cz designates 195.135.220.28 as permitted sender) smtp.mailfrom=vbabka@suse.cz; dmarc=none X-Rspamd-Server: rspam07 X-HE-Tag: 1645829491-378512 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: From: Oliver Glitta Sort the output of debugfs alloc_traces and free_traces by the frequency of allocation/freeing stack traces. Most frequently used stack traces will be printed first, e.g. for easier memory leak debugging. Signed-off-by: Oliver Glitta Signed-off-by: Vlastimil Babka Reviewed-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> Tested-by: Hyeonggon Yoo <42.hyeyoo@gmail.com> --- mm/slub.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/mm/slub.c b/mm/slub.c index 06599db4faa3..a74afe59a403 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -38,6 +38,7 @@ #include #include #include +#include #include #include @@ -6150,6 +6151,17 @@ static void *slab_debugfs_next(struct seq_file *seq, void *v, loff_t *ppos) return NULL; } +static int cmp_loc_by_count(const void *a, const void *b, const void *data) +{ + struct location *loc1 = (struct location *)a; + struct location *loc2 = (struct location *)b; + + if (loc1->count > loc2->count) + return -1; + else + return 1; +} + static void *slab_debugfs_start(struct seq_file *seq, loff_t *ppos) { struct loc_track *t = seq->private; @@ -6211,6 +6223,10 @@ static int slab_debug_trace_open(struct inode *inode, struct file *filep) spin_unlock_irqrestore(&n->list_lock, flags); } + /* Sort locations by count */ + sort_r(t->loc, t->count, sizeof(struct location), + cmp_loc_by_count, NULL, NULL); + bitmap_free(obj_map); return 0; }