From: Daniel Micay <danielmicay-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
To: David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>
Cc: Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>,
Aliaksey Kandratsenka
<alkondratenko-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
Shaohua Li <shli-b10kYP2dOMg@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Rik van Riel <riel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Mel Gorman <mel-wPRd99KPJ+uzQB+pC5nmwQ@public.gmane.org>,
Johannes Weiner <hannes-druUgvl0LCNAfugRpC6u6w@public.gmane.org>,
Michal Hocko <mhocko-AlSwsSmVLrQ@public.gmane.org>,
Andy Lutomirski <luto-kltTT9wpgjJwATOyAt5JVQ@public.gmane.org>,
"google-perftools-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org"
<google-perftools-/JYPxA39Uh5TLH3MbocFFw@public.gmane.org>
Subject: Re: [PATCH] mremap: add MREMAP_NOHOLE flag --resend
Date: Wed, 25 Mar 2015 23:36:55 -0400 [thread overview]
Message-ID: <55137ED7.6000300@gmail.com> (raw)
In-Reply-To: <55137C06.9020608-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
[-- Attachment #1: Type: text/plain, Size: 501 bytes --]
jemalloc doesn't really use free lists or sbrk for user allocations much
at all: thread caches are arrays of pointers (easier to flush and no
need to deref stale memory), red-black trees manage chunks and runs
within chunks, and runs use bitmaps. It can use sbrk as an alternate
source of chunks, but it defaults to using mmap and there's no real
advantage to switching it.
THP currently seems to be designed around the assumption that all
userspace allocators are variants of dlmalloc...
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
WARNING: multiple messages have this Message-ID (diff)
From: Daniel Micay <danielmicay@gmail.com>
To: David Rientjes <rientjes@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
Aliaksey Kandratsenka <alkondratenko@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Shaohua Li <shli@fb.com>,
linux-mm@kvack.org, linux-api@vger.kernel.org,
Rik van Riel <riel@redhat.com>, Hugh Dickins <hughd@google.com>,
Mel Gorman <mel@csn.ul.ie>, Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>,
Andy Lutomirski <luto@amacapital.net>,
"google-perftools@googlegroups.com"
<google-perftools@googlegroups.com>
Subject: Re: [PATCH] mremap: add MREMAP_NOHOLE flag --resend
Date: Wed, 25 Mar 2015 23:36:55 -0400 [thread overview]
Message-ID: <55137ED7.6000300@gmail.com> (raw)
In-Reply-To: <55137C06.9020608@gmail.com>
[-- Attachment #1: Type: text/plain, Size: 501 bytes --]
jemalloc doesn't really use free lists or sbrk for user allocations much
at all: thread caches are arrays of pointers (easier to flush and no
need to deref stale memory), red-black trees manage chunks and runs
within chunks, and runs use bitmaps. It can use sbrk as an alternate
source of chunks, but it defaults to using mmap and there's no real
advantage to switching it.
THP currently seems to be designed around the assumption that all
userspace allocators are variants of dlmalloc...
[-- Attachment #2: OpenPGP digital signature --]
[-- Type: application/pgp-signature, Size: 819 bytes --]
next prev parent reply other threads:[~2015-03-26 3:36 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-17 21:09 [PATCH] mremap: add MREMAP_NOHOLE flag --resend Shaohua Li
2015-03-17 21:09 ` Shaohua Li
[not found] ` <deaa4139de6e6422a0cec1e3282553aed3495e94.1426626497.git.shli-b10kYP2dOMg@public.gmane.org>
2015-03-18 22:31 ` Andrew Morton
2015-03-18 22:31 ` Andrew Morton
[not found] ` <20150318153100.5658b741277f3717b52e42d9-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2015-03-19 5:08 ` Shaohua Li
2015-03-19 5:08 ` Shaohua Li
[not found] ` <20150319050826.GA1591708-XA4dbxeItU7BTsLV8vAZyg2O0Ztt9esIQQ4Iyu8u01E@public.gmane.org>
2015-03-19 5:22 ` Andrew Morton
2015-03-19 5:22 ` Andrew Morton
[not found] ` <20150318222246.bc608dd0.akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>
2015-03-19 16:38 ` Shaohua Li
2015-03-19 16:38 ` Shaohua Li
2015-03-19 5:34 ` Daniel Micay
2015-03-19 5:34 ` Daniel Micay
2015-03-22 6:06 ` Aliaksey Kandratsenka
[not found] ` <CADpJO7zBLhjecbiQeTubnTReiicVLr0-K43KbB4uCL5w_dyqJg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-22 7:22 ` Daniel Micay
2015-03-22 7:22 ` Daniel Micay
[not found] ` <550E6D9D.1060507-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-03-24 4:36 ` Aliaksey Kandratsenka
2015-03-24 4:36 ` Aliaksey Kandratsenka
2015-03-24 14:54 ` Daniel Micay
2015-03-25 16:22 ` Vlastimil Babka
2015-03-25 16:22 ` Vlastimil Babka
2015-03-25 20:49 ` Daniel Micay
2015-03-25 20:54 ` Daniel Micay
[not found] ` <55131F70.7020503-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-03-26 0:19 ` David Rientjes
2015-03-26 0:19 ` David Rientjes
2015-03-26 0:24 ` Daniel Micay
[not found] ` <551351CA.3090803-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-03-26 2:31 ` David Rientjes
2015-03-26 2:31 ` David Rientjes
[not found] ` <alpine.DEB.2.10.1503251914260.16714-X6Q0R45D7oAcqpCFd4KODRPsWskHk0ljAL8bYrjMMd8@public.gmane.org>
2015-03-26 3:24 ` Daniel Micay
2015-03-26 3:24 ` Daniel Micay
[not found] ` <55137C06.9020608-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-03-26 3:36 ` Daniel Micay [this message]
2015-03-26 3:36 ` Daniel Micay
2015-03-26 17:25 ` Vlastimil Babka
2015-03-26 17:25 ` Vlastimil Babka
2015-03-26 20:45 ` Daniel Micay
2015-03-23 5:17 ` Shaohua Li
2015-03-24 5:25 ` Aliaksey Kandratsenka
[not found] ` <CADpJO7zk8J3q7Bw9NibV9CzLarO+YkfeshyFTTq=XeS5qziBiA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-03-24 14:39 ` Daniel Micay
2015-03-24 14:39 ` Daniel Micay
2015-03-25 5:02 ` Shaohua Li
2015-03-26 0:50 ` Minchan Kim
2015-03-26 1:21 ` Daniel Micay
2015-03-26 1:21 ` Daniel Micay
[not found] ` <55135F06.4000906-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2015-03-26 7:02 ` Minchan Kim
2015-03-26 7:02 ` Minchan Kim
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