linux-ext4 - [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

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Message-ID: <bug-217965-13602-nVpVMbmHGs@https.bugzilla.kernel.org/>
Date: Sat, 06 Jan 2024 03:18:01 +0000
From: bugzilla-daemon@...nel.org
To: linux-ext4@...r.kernel.org
Subject: [Bug 217965] ext4(?) regression since 6.5.0 on sata hdd

https://bugzilla.kernel.org/show_bug.cgi?id=217965

--- Comment #64 from Matthew Stapleton (matthew4196@...il.com) ---
After patching ext4_mb_choose_next_group set of functions with
noinline_for_stack, perf is now including those in the report: perf report
--stdio -i perf.data .  That usage in ext4_mb_regular_allocator is only about
1.39% (compared to 17.59 for ext4_get_group_desc and ext4_get_group_info) with
ext4_mb_choose_next_group_goal_fast using 0.74% and
ext4_mb_choose_next_group_best_avail using 0.58% which indicates
ext4_mb_choose_next_group_best_avail isn't stalling for me like it was before.

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