linux-kernel - [PATCH v5 0/2] mm/vmalloc.c: improve readability and rewrite vmap

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Date:   Tue, 16 Jul 2019 21:26:02 +0800
From:   Pengfei Li <lpf.vector@...il.com>
To:     akpm@...ux-foundation.org, willy@...radead.org
Cc:     urezki@...il.com, rpenyaev@...e.de, peterz@...radead.org,
        guro@...com, rick.p.edgecombe@...el.com, rppt@...ux.ibm.com,
        aryabinin@...tuozzo.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Pengfei Li <lpf.vector@...il.com>
Subject: [PATCH v5 0/2] mm/vmalloc.c: improve readability and rewrite vmap_area

v4 -> v5
* Base on next-20190716
* patch 1: From Uladzislau Rezki (Sony) <urezki@...il.com> (author)
  - https://lkml.org/lkml/2019/7/16/276
* patch 2: Use v3

v3 -> v4:
* Base on next-20190711
* patch 1: From: Uladzislau Rezki (Sony) <urezki@...il.com> (author)
  - https://lkml.org/lkml/2019/7/3/661
* patch 2: Modify the layout of struct vmap_area for readability

v2 -> v3:
* patch 1-4: Abandoned
* patch 5:
  - Eliminate "flags" (suggested by Uladzislau Rezki)
  - Base on https://lkml.org/lkml/2019/6/6/455
    and https://lkml.org/lkml/2019/7/3/661

v1 -> v2:
* patch 3: Rename __find_vmap_area to __search_va_in_busy_tree
           instead of __search_va_from_busy_tree.
* patch 5: Add motivation and necessary test data to the commit
           message.
* patch 5: Let va->flags use only some low bits of va_start
           instead of completely overwriting va_start.

The current implementation of struct vmap_area wasted space.

After applying this commit, sizeof(struct vmap_area) has been
reduced from 11 words to 8 words.

Pengfei Li (1):
  mm/vmalloc: modify struct vmap_area to reduce its size

Uladzislau Rezki (Sony) (1):
  mm/vmalloc: do not keep unpurged areas in the busy tree

 include/linux/vmalloc.h | 20 +++++++----
 mm/vmalloc.c            | 76 +++++++++++++++++++++++++++++------------
 2 files changed, 67 insertions(+), 29 deletions(-)

-- 
2.21.0