From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Josef Bacik To: axboe@kernel.dk, kernel-team@fb.com, linux-block@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, hannes@cmpxchg.org, linux-kernel@vger.kernel.org, tj@kernel.org, linux-fsdevel@vger.kernel.org Subject: [PATCH 05/13] swap,blkcg: issue swap io with the appropriate context Date: Tue, 29 May 2018 17:17:16 -0400 Message-Id: <20180529211724.4531-6-josef@toxicpanda.com> In-Reply-To: <20180529211724.4531-1-josef@toxicpanda.com> References: <20180529211724.4531-1-josef@toxicpanda.com> Sender: owner-linux-mm@kvack.org List-ID: From: Tejun Heo For backcharging we need to know who the page belongs to when swapping it out. Signed-off-by: Tejun Heo Signed-off-by: Josef Bacik --- mm/page_io.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/mm/page_io.c b/mm/page_io.c index a552cb37e220..61e1268e5dbc 100644 --- a/mm/page_io.c +++ b/mm/page_io.c @@ -339,6 +339,16 @@ int __swap_writepage(struct page *page, struct writeback_control *wbc, goto out; } bio->bi_opf = REQ_OP_WRITE | REQ_SWAP | wbc_to_write_flags(wbc); +#if defined(CONFIG_MEMCG) && defined(CONFIG_BLK_CGROUP) + if (page->mem_cgroup) { + struct cgroup_subsys_state *blkcg_css; + + blkcg_css = cgroup_get_e_css(page->mem_cgroup->css.cgroup, + &io_cgrp_subsys); + bio_associate_blkcg(bio, blkcg_css); + css_put(blkcg_css); + } +#endif count_swpout_vm_event(page); set_page_writeback(page); unlock_page(page); -- 2.14.3