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38 lines
1.2 KiB
Diff
38 lines
1.2 KiB
Diff
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From b6d2c4475d5abc05dd009575b90556bdd3c78ad0 Mon Sep 17 00:00:00 2001
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From: =?utf8?q?Niklas=20Hamb=C3=BCchen?= <mail@nh2.me>
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Date: Thu, 8 Aug 2019 22:02:27 +0200
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Subject: [PATCH] malloc: Fix missing accounting of top chunk in malloc_info
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[BZ #24026]
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Fixes `<total type="rest" size="..."> incorrectly showing as 0 most
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of the time.
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The rest value being wrong is significant because to compute the
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actual amount of memory handed out via malloc, the user must subtract
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it from <system type="current" size="...">. That result being wrong
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makes investigating memory fragmentation issues like
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<https://bugzilla.redhat.com/show_bug.cgi?id=843478> close to
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impossible.
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diff --git a/malloc/malloc.c b/malloc/malloc.c
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index 343d89f..0e65d63 100644
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--- a/malloc/malloc.c
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+++ b/malloc/malloc.c
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@@ -5406,6 +5406,12 @@ __malloc_info (int options, FILE *fp)
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__libc_lock_lock (ar_ptr->mutex);
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+ /* Account for top chunk. The top-most available chunk is
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+ treated specially and is never in any bin. See "initial_top"
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+ comments. */
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+ avail = chunksize (ar_ptr->top);
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+ nblocks = 1; /* Top always exists. */
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+
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for (size_t i = 0; i < NFASTBINS; ++i)
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{
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mchunkptr p = fastbin (ar_ptr, i);
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--
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2.9.3
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