Add information to .eh_frame ELF secion about make_fcontext function. - #321

Merged
olk merged 1 commit into
boostorg:developfrom
vchigrin:develop
Dec 27, 2025
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Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom
vchigrin:develop

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@vchigrinvchigrin commented Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.
That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".

@vchigrin

vchigrin commented Dec 10, 2025

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I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.

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vchigrin commented Dec 25, 2025

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On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:

Before changes: 5071µs
After changes: 82µs

@olk
olk merged commit 639fa73 into boostorg:developDec 27, 2025
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olk commented Dec 27, 2025

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robot-piglet pushed a commit to userver-framework/userver that referenced this pull request Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano mentioned this pull request Jul 23, 2026
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, 'i'); if (__m === '*' || __re.test(location.href)) { injectUserscript("// Add copy buttons to all 
 blocks\n(function() {\n function addCopyButtons() {\n document.querySelectorAll('pre code').forEach(function(codeBlock) {\n if (codeBlock.parentElement.hasAttribute('data-copy-added')) return;\n codeBlock.parentElement.setAttribute('data-copy-added', 'true');\n \n var btn = document.createElement('button');\n btn.textContent = 'Copy';\n btn.style.cssText = 'position:absolute;top:4px;right:4px;padding:2px 8px;font-size:11px;background:#4ecdc4;border:none;border-radius:4px;color:#1a1a2e;cursor:pointer;opacity:0.7;transition:opacity 0.2s;';\n btn.onmouseover = function() { this.style.opacity = '1'; };\n btn.onmouseout = function() { this.style.opacity = '0.7'; };\n btn.onclick = function() {\n navigator.clipboard.writeText(codeBlock.textContent).then(function() {\n btn.textContent = 'Copied!';\n setTimeout(function() { btn.textContent = 'Copy'; }, 1500);\n });\n };\n codeBlock.parentElement.style.position = 'relative';\n codeBlock.parentElement.appendChild(btn);\n });\n }\n \n addCopyButtons();\n \n // Re-run on dynamic content\n var observer = new MutationObserver(addCopyButtons);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Add Copy Buttons to Code Blocks");
}
} catch(__e) { console.warn('[Userscript:Add Copy Buttons to Code Blocks]', __e); }
})();
(function(){
try {
var __m = "github.com";
var __re = new RegExp('^' + "github\\.com" + '

Skip to content
Add information to .eh_frame ELF secion about make_fcontext function. - #321
Merged
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
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@vchigrin
@vchigrinvchigrin
commented
Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
@vchigrin
vchigrin
commented
Dec 10, 2025

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ContributorAuthor
I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
@vchigrin
vchigrin
commented
Dec 25, 2025

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On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
@olk
olk
merged commit 639fa73
into
boostorg:developDec 27, 2025

21 of 26 checks passed

@olk
olk
commented
Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
this pull request
Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
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@vchigrin@olk

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Force GitHub README to respect dark mode\n(function() {\n var style = document.createElement('style');\n style.textContent = '\n .markdown-body {\n color-scheme: dark light;\n }\n .markdown-body pre { background: #161b22 !important; }\n .markdown-body code { background: rgba(110, 118, 129, 0.4) !important; }\n .markdown-body table th, .markdown-body table td { border-color: #30363d !important; }\n .markdown-body img { background: #0d1117; }\n .markdown-body blockquote { border-left-color: #8b949e; }\n .markdown-body hr { border-color: #30363d; }\n ';\n document.head.appendChild(style);\n})();", "GitHub Dark Mode README Fix");
}
} catch(__e) { console.warn('[Userscript:GitHub Dark Mode README Fix]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add information to .eh_frame ELF secion about make_fcontext function. - #321
Merged
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
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@vchigrin
@vchigrinvchigrin
commented
Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
@vchigrin
vchigrin
commented
Dec 10, 2025

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ContributorAuthor
I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
@vchigrin
vchigrin
commented
Dec 25, 2025

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ContributorAuthor
On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
@olk
olk
merged commit 639fa73
into
boostorg:developDec 27, 2025

21 of 26 checks passed

@olk
olk
commented
Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
this pull request
Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
 Open

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Highlight search terms from Google/DuckDuckGo/Bing referrer\n(function() {\n var ref = document.referrer;\n var terms = [];\n \n if (ref.includes('google.com') || ref.includes('duckduckgo.com') || ref.includes('bing.com')) {\n var url = new URL(ref);\n var q = url.searchParams.get('q') || url.searchParams.get('p');\n if (q) {\n terms = q.split(/\\s+/).filter(function(t) { return t.length > 2; });\n }\n }\n \n if (terms.length === 0) return;\n \n var style = document.createElement('style');\n style.textContent = '.userscript-highlight { background: #fbbf24; color: #1a1a2e; padding: 1px 3px; border-radius: 2px; }';\n document.head.appendChild(style);\n \n function highlight(node) {\n if (node.nodeType === 3) { // text node\n var text = node.textContent;\n var found = false;\n terms.forEach(function(term) {\n var regex = new RegExp('(' + term.replace(/[.*+?^${}()|[\\]\\\\]/g, '\\\\') + ')', 'gi');\n if (regex.test(text)) {\n found = true;\n var frag = document.createDocumentFragment();\n var parts = text.split(regex);\n parts.forEach(function(part, i) {\n if (i % 2 === 0) {\n frag.appendChild(document.createTextNode(part));\n } else {\n var span = document.createElement('span');\n span.className = 'userscript-highlight';\n span.textContent = part;\n frag.appendChild(span);\n }\n });\n node.parentNode.replaceChild(frag, node);\n }\n });\n } else if (node.nodeType === 1 && node.childNodes) { // element\n var skipTags = ['SCRIPT', 'STYLE', 'NOSCRIPT', 'TEXTAREA', 'INPUT', 'SELECT'];\n if (!skipTags.includes(node.tagName)) {\n Array.from(node.childNodes).forEach(highlight);\n }\n }\n }\n \n highlight(document.body);\n \n // Re-highlight on dynamic content\n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1 || node.nodeType === 3) highlight(node);\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Highlight Search Terms");
}
} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add information to .eh_frame ELF secion about make_fcontext function. - #321
Merged
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Conversation
@vchigrin
@vchigrinvchigrin
commented
Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
@vchigrin
vchigrin
commented
Dec 10, 2025

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ContributorAuthor
I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
@vchigrin
vchigrin
commented
Dec 25, 2025

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ContributorAuthor
On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
@olk
olk
merged commit 639fa73
into
boostorg:developDec 27, 2025

21 of 26 checks passed

@olk
olk
commented
Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
this pull request
Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
 Open

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@vchigrin@olk

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Strip utm_, fbclid, gclid, etc. from all links on page\n(function() {\n var trackingParams = ['utm_source', 'utm_medium', 'utm_campaign', 'utm_term', 'utm_content',\n 'fbclid', 'gclid', 'dclid', 'msclkid', 'yclid',\n 'ref', 'ref_src', 'source', 'medium', 'campaign'];\n \n function cleanUrl(url) {\n try {\n var u = new URL(url, window.location.origin);\n var changed = false;\n trackingParams.forEach(function(p) {\n if (u.searchParams.has(p)) {\n u.searchParams.delete(p);\n changed = true;\n }\n });\n return changed ? u.toString() : url;\n } catch (e) {\n return url;\n }\n }\n \n function cleanLinks() {\n document.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n \n cleanLinks();\n \n var observer = new MutationObserver(function(mutations) {\n mutations.forEach(function(m) {\n m.addedNodes.forEach(function(node) {\n if (node.nodeType === 1) {\n if (node.tagName === 'A') cleanLinks();\n node.querySelectorAll('a[href]').forEach(function(a) {\n var clean = cleanUrl(a.href);\n if (clean !== a.href) a.href = clean;\n });\n }\n });\n });\n });\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "Remove Tracking Parameters from Links");
}
} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '

Skip to content
Add information to .eh_frame ELF secion about make_fcontext function. - #321
Merged
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Conversation
@vchigrin
@vchigrinvchigrin
commented
Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
@vchigrin
vchigrin
commented
Dec 10, 2025

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ContributorAuthor
I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
@vchigrin
vchigrin
commented
Dec 25, 2025

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ContributorAuthor
On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
@olk
olk
merged commit 639fa73
into
boostorg:developDec 27, 2025

21 of 26 checks passed

@olk
olk
commented
Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
this pull request
Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
 Open

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@vchigrin@olk

, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Auto-enable theater mode on YouTube\n(function() {\n function tryTheater() {\n var btn = document.querySelector('button[aria-label=\"Theater mode\"], ytd-player #player button[title=\"Theater mode\"]');\n if (btn && !btn.classList.contains('activated')) {\n btn.click();\n }\n }\n \n // Try immediately\n tryTheater();\n \n // Try after navigation (SPA)\n var lastUrl = location.href;\n setInterval(function() {\n if (location.href !== lastUrl) {\n lastUrl = location.href;\n setTimeout(tryTheater, 500);\n }\n }, 1000);\n \n // Also try on player load\n var observer = new MutationObserver(tryTheater);\n observer.observe(document.body, { childList: true, subtree: true });\n})();", "YouTube Theater Mode Default");
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add information to .eh_frame ELF secion about make_fcontext function. - #321
Merged
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Conversation
@vchigrin
@vchigrinvchigrin
commented
Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
@vchigrin
vchigrin
commented
Dec 10, 2025

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ContributorAuthor
I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
@vchigrin
vchigrin
commented
Dec 25, 2025

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ContributorAuthor
On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
@olk
olk
merged commit 639fa73
into
boostorg:developDec 27, 2025

21 of 26 checks passed

@olk
olk
commented
Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
this pull request
Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
 Open

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Remove or un-stick sticky/fixed headers that block content\n(function() {\n function unstick() {\n document.querySelectorAll('header, nav, [role=\"banner\"], .header, .navbar, .sticky, .fixed-top, [style*=\"position: fixed\"], [style*=\"position:sticky\"]').forEach(function(el) {\n if (el.style.position === 'fixed' || el.style.position === 'sticky' || \n getComputedStyle(el).position === 'fixed' || getComputedStyle(el).position === 'sticky') {\n el.style.position = 'static';\n el.style.top = 'auto';\n el.style.zIndex = 'auto';\n }\n });\n }\n \n unstick();\n \n var observer = new MutationObserver(unstick);\n observer.observe(document.body, { childList: true, subtree: true, attributes: true, attributeFilter: ['style', 'class'] });\n})();", "Kill Sticky Headers");
}
} catch(__e) { console.warn('[Userscript:Kill Sticky Headers]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '

Skip to content
Add information to .eh_frame ELF secion about make_fcontext function. - #321
Merged
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Conversation
@vchigrin
@vchigrinvchigrin
commented
Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
@vchigrin
vchigrin
commented
Dec 10, 2025

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ContributorAuthor
I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
@vchigrin
vchigrin
commented
Dec 25, 2025

Copy link


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ContributorAuthor
On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
@olk
olk
merged commit 639fa73
into
boostorg:developDec 27, 2025

21 of 26 checks passed

@olk
olk
commented
Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
this pull request
Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
 Open

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, 'i');
if (__m === '*' || __re.test(location.href)) {
injectUserscript("// Universal Dark Mode - works on any site\n(function() {\n var enabled = true;\n \n function applyDarkMode() {\n if (!enabled) return;\n \n // Create style element if it doesn't exist\n var style = document.getElementById('universal-dark-mode-style');\n if (!style) {\n style = document.createElement('style');\n style.id = 'universal-dark-mode-style';\n document.head.appendChild(style);\n }\n \n // Dark mode CSS - inverts colors but preserves images/video\n style.textContent = '\n /* Invert everything except media */\n html {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #1a1a2e !important;\n }\n \n /* Restore images, videos, iframes, canvas */\n img, video, iframe, canvas, svg, picture, [style*=\"background-image\"] {\n filter: invert(1) hue-rotate(180deg) !important;\n }\n \n /* Preserve specific elements that should not be inverted */\n .no-dark-mode, .no-dark-mode *,\n [data-theme=\"light\"], [data-theme=\"light\"],\n .ace_editor, .ace_editor *,\n .CodeMirror, .CodeMirror *,\n .monaco-editor, .monaco-editor *,\n .markdown-body pre, .markdown-body pre *,\n .highlight, .highlight *,\n pre code, pre code * {\n filter: none !important;\n }\n \n /* Fix common UI elements */\n .modal, .popup, .dropdown-menu, .tooltip, .popover {\n filter: invert(1) hue-rotate(180deg) !important;\n background: #2d2d44 !important;\n border-color: #444 !important;\n }\n \n /* Scrollbars */\n ::-webkit-scrollbar { background: #1a1a2e !important; }\n ::-webkit-scrollbar-thumb { background: #444 !important; }\n ::-webkit-scrollbar-thumb:hover { background: #555 !important; }\n \n /* Selection */\n ::selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ::-moz-selection { background: #4ecdc4 !important; color: #1a1a2e !important; }\n ';\n }\n \n function removeDarkMode() {\n var style = document.getElementById('universal-dark-mode-style');\n if (style) style.remove();\n }\n \n // Toggle with Alt+Shift+D\n document.addEventListener('keydown', function(e) {\n if (e.altKey && e.shiftKey && e.key === 'D') {\n e.preventDefault();\n enabled = !enabled;\n if (enabled) {\n applyDarkMode();\n console.log('[Universal Dark Mode] Enabled');\n } else {\n removeDarkMode();\n console.log('[Universal Dark Mode] Disabled');\n }\n }\n });\n \n // Apply on load\n applyDarkMode();\n \n // Re-apply on dynamic content\n var observer = new MutationObserver(function(mutations) {\n if (enabled && !document.getElementById('universal-dark-mode-style')) {\n applyDarkMode();\n }\n });\n observer.observe(document.head, { childList: true });\n \n console.log('[Universal Dark Mode] Loaded - Press Alt+Shift+D to toggle');\n})();", "Universal Dark Mode");
}
} catch(__e) { console.warn('[Userscript:Universal Dark Mode]', __e); }
})();
})();

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Add information to .eh_frame ELF secion about make_fcontext function. - #321
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olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
Dec 27, 2025
Merged
Add information to .eh_frame ELF secion about make_fcontext function.#321
olk merged 1 commit into
boostorg:developfrom 
vchigrin:develop
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Dec 10, 2025

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Clang version of libunwind uses long linear scan of the .eh_frame section if it fails to find frame information in .eh_frame_hdr.

That causes long times of stack unwinding in case when current stack has frames with missed FDE records, so it is better to have information about all frames in the stack up until frame which marks return address ad "undefined/unrecoverable".
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Dec 10, 2025

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I am working on PR to clang to make stack walking times better in case of missed frames (See llvm/llvm-project#167849 ). But while generic solution is not ready, small local fix here seems resasonable.
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Dec 25, 2025

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On our test binary these changes speed up stack unwinding rather strong. Time of construction of boost::stacktrace::stacktrace object in coroutine was:
Before changes: 5071µs

After changes: 82µs
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olk
merged commit 639fa73
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boostorg:developDec 27, 2025

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Dec 27, 2025

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ty
robot-piglet pushed a commit
to userver-framework/userver
that referenced
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Jan 13, 2026
@vchigrin
feat userver: Take patch of boost.context from upstream.
909d1fd
PR in upstream repository boostorg/context#321.
These changes required to speed up stack unwinding in coroutine context.
commit_hash:3873a3caa887c3b158e6ad9e179743eb18dc6ea7
@AlgunenanoAlgunenano
mentioned this pull request
Jul 23, 2026
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