linux-kernel - [PATCH v3 0/4] Some cleanups for the KVA/vmalloc

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Date:   Mon, 27 May 2019 11:38:38 +0200
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org
Cc:     Roman Gushchin <guro@...com>, Uladzislau Rezki <urezki@...il.com>,
        Hillf Danton <hdanton@...a.com>,
        Michal Hocko <mhocko@...e.com>,
        Matthew Wilcox <willy@...radead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Thomas Garnier <thgarnie@...gle.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Joel Fernandes <joelaf@...gle.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...e.hu>, Tejun Heo <tj@...nel.org>
Subject: [PATCH v3 0/4] Some cleanups for the KVA/vmalloc

Patch [1] removes an unused argument "node" from the __alloc_vmap_area()
function and that is it.

Patch [2] is not driven by any particular workload that fails or so,
it is just better approach to handle one specific split case.

Patch [3] some cleanups in merging path. Basically on a first step
the mergeable node is detached and there is no reason to "unlink" it.
The same concerns the second step unless it has been merged on first
one.

Patch [4] moves BUG_ON()/RB_EMPTY_NODE() checks under "unlink" logic.
After [3] merging path "unlink" only linked nodes. Therefore we can say
that removing detached object is a bug in all cases.

v2->v3:
    - remove the odd comment from the [3];

v1->v2:
    - update the commit message. [2] patch;
    - fix typos in comments. [2] patch;
    - do the "preload" for NUMA awareness. [2] patch;

Uladzislau Rezki (Sony) (4):
  mm/vmap: remove "node" argument
  mm/vmap: preload a CPU with one object for split purpose
  mm/vmap: get rid of one single unlink_va() when merge
  mm/vmap: move BUG_ON() check to the unlink_va()

 mm/vmalloc.c | 115 +++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 89 insertions(+), 26 deletions(-)

-- 
2.11.0