From: DJ Delorie <dj@redhat.com>
To: Szabolcs Nagy <szabolcs.nagy@arm.com>
Cc: libc-alpha@sourceware.org
Subject: Re: [PATCH 2/6] malloc: Use different tag after mremap
Date: Tue, 23 Mar 2021 16:03:29 -0400 [thread overview]
Message-ID: <xn8s6dk57y.fsf@rhel8.vm> (raw)
In-Reply-To: <4aadefff0647fd8a4ade4377bdfab60989c37b7f.1616155129.git.szabolcs.nagy@arm.com> (message from Szabolcs Nagy on Fri, 19 Mar 2021 13:26:32 +0000)
Szabolcs Nagy <szabolcs.nagy@arm.com> writes:
> The comment explained why different tag is used after mremap, but
> for that correctly tagged pointer should be passed to tag_new_usable.
> Use chunk2mem to get the tag.
> - void *newmem = chunk2rawmem (newp);
> + void *newmem = chunk2mem (newp);
> /* Give the new block a different tag. This helps to ensure
> that stale handles to the previous mapping are not
> reused. There's a performance hit for both us and the
Ok.
LGTM
Reviewed-by: DJ Delorie <dj@redhat.com>
next prev parent reply other threads:[~2021-03-23 20:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-19 13:25 [PATCH 0/6] malloc: more memory tagging optimizations Szabolcs Nagy
2021-03-19 13:26 ` [PATCH 1/6] malloc: Use memsize instead of CHUNK_AVAILABLE_SIZE Szabolcs Nagy
2021-03-23 20:01 ` DJ Delorie
2021-03-19 13:26 ` [PATCH 2/6] malloc: Use different tag after mremap Szabolcs Nagy
2021-03-23 20:03 ` DJ Delorie [this message]
2021-03-19 13:26 ` [PATCH 3/6] malloc: Use chunk2rawmem throughout Szabolcs Nagy
2021-03-23 20:25 ` DJ Delorie
2021-03-19 13:27 ` [PATCH 4/6] malloc: Rename chunk2rawmem Szabolcs Nagy
2021-03-23 20:43 ` DJ Delorie
2021-03-19 13:27 ` [PATCH 5/6] malloc: Remove unnecessary tagging around _mid_memalign Szabolcs Nagy
2021-03-23 20:44 ` DJ Delorie
2021-03-19 13:27 ` [PATCH 6/6] malloc: Ensure mtag code path in checked_request2size is cold Szabolcs Nagy
2021-03-23 20:46 ` DJ Delorie
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