linux-kernel - Re: [PATCH v6 1/2] mm/vmalloc: do not keep unpurged areas in the busy tree

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 24 Jul 2019 19:36:37 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Pengfei Li <lpf.vector@...il.com>
Cc:     willy@...radead.org, 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
Subject: Re: [PATCH v6 1/2] mm/vmalloc: do not keep unpurged areas in the
 busy tree

On Tue, 16 Jul 2019 23:26:55 +0800 Pengfei Li <lpf.vector@...il.com> wrote:

> From: "Uladzislau Rezki (Sony)" <urezki@...il.com>
> 
> The busy tree can be quite big, even though the area is freed
> or unmapped it still stays there until "purge" logic removes
> it.
> 
> 1) Optimize and reduce the size of "busy" tree by removing a
> node from it right away as soon as user triggers free paths.
> It is possible to do so, because the allocation is done using
> another augmented tree.
> 
> The vmalloc test driver shows the difference, for example the
> "fix_size_alloc_test" is ~11% better comparing with default
> configuration:
> 
> sudo ./test_vmalloc.sh performance
> 
> <default>
> Summary: fix_size_alloc_test loops: 1000000 avg: 993985 usec
> Summary: full_fit_alloc_test loops: 1000000 avg: 973554 usec
> Summary: long_busy_list_alloc_test loops: 1000000 avg: 12617652 usec
> <default>
> 
> <this patch>
> Summary: fix_size_alloc_test loops: 1000000 avg: 882263 usec
> Summary: full_fit_alloc_test loops: 1000000 avg: 973407 usec
> Summary: long_busy_list_alloc_test loops: 1000000 avg: 12593929 usec
> <this patch>
> 
> 2) Since the busy tree now contains allocated areas only and does
> not interfere with lazily free nodes, introduce the new function
> show_purge_info() that dumps "unpurged" areas that is propagated
> through "/proc/vmallocinfo".
> 
> 3) Eliminate VM_LAZY_FREE flag.
> 
> Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>

This should have included your signed-off-by, since you were on the
patch delivery path.  (Documentation/process/submitting-patches.rst,
section 11).

Please send along your signed-off-by?