Kernel Newbies archive on
 help / color / Atom feed
From: "Valdis Klētnieks" <>
To: Mulyadi Santosa <>
Cc: kernelnewbies <>
Subject: Re: Is there some method or software that could purposely generate a lot of physical memory fragmentations on linux?
Date: Fri, 03 Jul 2020 00:58:37 -0400
Message-ID: <6499.1593752317@turing-police> (raw)
In-Reply-To: <>

[-- Attachment #1.1: Type: text/plain, Size: 577 bytes --]

On Thu, 02 Jul 2020 15:29:18 +0700, Mulyadi Santosa said:

> Just pseudo idea, if this is in user space, try to:  allocate many blocks
> of memory using malloc, each having different size, keep the returned
> pointer, then randomly free() some of them, then malloc() again with
> different size

That will cause userspace malloc() to have fragmentation, but as far
as the kernel is concerned it's all just 4K pages of user memory.

Causing physical memory fragmentation will require abusing the kernel
memory allocators such as kmalloc() and vmalloc() and friends.

[-- Attachment #1.2: Type: application/pgp-signature, Size: 832 bytes --]

[-- Attachment #2: Type: text/plain, Size: 170 bytes --]

Kernelnewbies mailing list

  reply index

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30  6:51 孙世龙 sunshilong
2020-07-02  8:29 ` Mulyadi Santosa
2020-07-03  4:58   ` Valdis Klētnieks [this message]
2020-07-03  5:20 ` 孙世龙 sunshilong

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=6499.1593752317@turing-police \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Kernel Newbies archive on

Archives are clonable:
	git clone --mirror kernelnewbies/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 kernelnewbies kernelnewbies/ \
	public-inbox-index kernelnewbies

Example config snippet for mirrors

Newsgroup available over NNTP:

AGPL code for this site: git clone