linux-kernel - [PATCH v3 0/1] mm/vmalloc.c: improve readability and rewrite vmap

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Message-Id: <20190704133040.5623-1-lpf.vector@gmail.com>
Date:   Thu,  4 Jul 2019 21:30:39 +0800
From:   Pengfei Li <lpf.vector@...il.com>
To:     akpm@...ux-foundation.org, peterz@...radead.org, urezki@...il.com
Cc:     rpenyaev@...e.de, mhocko@...e.com, guro@...com,
        aryabinin@...tuozzo.com, rppt@...ux.ibm.com, mingo@...nel.org,
        rick.p.edgecombe@...el.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Pengfei Li <lpf.vector@...il.com>
Subject: [PATCH v3 0/1] mm/vmalloc.c: improve readability and rewrite vmap_area

v2 -> v3:
* patch 1-4: Abandoned
* patch 5:
  - Eliminate "flags" (suggested by Uladzislau Rezki)
  - Based 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):
  Modify struct vmap_area to reduce its size

 include/linux/vmalloc.h | 20 +++++++++++++-------
 mm/vmalloc.c            | 24 ++++++++++--------------
 2 files changed, 23 insertions(+), 21 deletions(-)

-- 
2.21.0